Answer:
answer is A corresponding to 60 W
Explanation:
The polarization phenomenon is descriptor Malus's law
I = I₀ cos² θ
Where I and Io are the transmitted and incident intensities, respectively, θ is the angle between the direction of polarization of the light and the polarizer.
Unpolarized light strikes the first polarizer and half of it is transmitted, which has the polarization direction of the polarizer
I₁ = ½ I₀
I₁ = ½ 300
I₁ = 150 W
The transmission by the second polarizer (P2) is
I₂ = I₁ cos² θ 1
I₂ = 150 cos² 45
I₂ = 75 W
The transmission of the third polarizer (P3)
I₃ = I₂ cos² θ 2
I₃ = 75 cos² 30
I₃ = 56.25 W
This is the light transmitted by the 56 W system, the closest answer is A corresponding to 60 W
If a metal has a specific heat, then the metal could make an excellent material for cookware because
A. it can absorb much more heat before the temperature increases.
B. it maintains a constant temperature.
C. it takes less heat to raise the temperature of the metal.
D. it will not burn food.
Answer:
C) Because it takes less heat to raise the temperature of the metal
Explanation:
A) No. Metals have low specific heats compared to other solids thus they would absorb less heat in order to increase the temperature
B) No. Since they have lower specific heats they are more vulnerable to temperature changes due to variations in the heat rate
C) Yes. It takes less heat to raise the temperature of water due to their lower specific heats
D) No. Because the temperature can be chosen regulating the heat rate to the cookware. Also food burning is related with thermal conduction of cookware and from the cookware to food.
Answer:
C is correct
Explanation:
A parallel-plate capacitor with circular plates of radius R is being charged by a battery, which provides a constant current. At what radius inside and outside the capacitor gap is the magnitude of the induced magnetic field equal to half of its maximum value? (Use any variable or symbol stated above as necessary.)
To solve this problem it is necessary to apply the concepts related to the magnetic field.
According to the information, the magnetic field INSIDE the plates is,
[tex]B=\frac{1}{2} \mu \epsilon_0 r[/tex]
Where,
[tex]\mu =[/tex]Permeability constant
[tex]\epsilon_0 =[/tex]Electromotive force
r = Radius
From this deduction we can verify that the distance is proportional to the field
[tex]B \propto r[/tex]
Then the distance relationship would be given by
[tex]\frac{r}{R} = \frac{B}{B_{max}}[/tex]
[tex]r =\frac{B}{B_{max}} R[/tex]
[tex]r = \frac{0.5B_{max}}{B_{max}}R[/tex]
[tex]r = 0.5R[/tex]
On the outside, however, it is defined by
[tex]B = \frac{\mu_0 i_d}{2\pi r}[/tex]
Here the magnetic field is inversely proportional to the distance, that is
[tex]B \not\propto r[/tex]
Then,
[tex]\frac{r}{R} = \frac{B_{max}{B}}[/tex]
[tex]r = \frac{B_{max}{B}}R[/tex]
[tex]r = \frac{B_{max}{0.5B_{max}}}R[/tex]
[tex]r = 2R[/tex]
A uniform disk with a mass of 5.0 kg and diameter 30 cm rotates on a frictionless fixed axis through its center and perpendicular to the disk faces. A uniform force of 4.0 N is applied tangentially to the rim of the disk. What is the angular acceleration of the disk?
Answer:[tex]\alpha =10.66 rad/s^2[/tex]
Explanation:
Given
mass of disk [tex]m=5 kg[/tex]
diameter of disc [tex]d=30 cm[/tex]
Force applied [tex]F=4 N[/tex]
Now this force will Produce a torque of magnitude
[tex]T=F\cdot r[/tex]
[tex]T=4\dot 0.15[/tex]
[tex]T=0.6 N-m[/tex]
And Torque is given Product of moment of inertia and angular acceleration [tex](\alpha )[/tex]
[tex]T=I\cdot \alpha [/tex]
Moment of inertia for Disc [tex]I= \frac{Mr^2}{2}[/tex]
[tex]I=0.05625 kg-m^2[/tex]
[tex]0.6=0.05625\cdot \alpha [/tex]
[tex]\alpha =10.66 rad/s^2[/tex]
A 1.40 mH inductor and a 1.00 µF capacitor are connected in series. The current in the circuit is described by I = 14.0 t, where t is in seconds and I is in amperes. The capacitor initially has no charge.
(a) Determine the voltage across the inductor as a function of time. mV
(b) Determine the voltage across the capacitor as a function of time. (V/s2) t2
(c) Determine the time when the energy stored in the capacitor first exceeds that in the inductor.
Answer:
Explanation:
Inductance L = 1.4 x 10⁻³ H
Capacitance C = 1 x 10⁻⁶ F
a )
current I = 14 .0 t
dI / dt = 14
voltage across inductor
= L dI / dt
= 1.4 x 10⁻³ x 14
= 19.6 x 10⁻³ V
= 19.6 mV
It does not depend upon time because it is constant at 19.6 mV.
b )
Voltage across capacitor
V = ∫ dq / C
= 1 / C ∫ I dt
= 1 / C ∫ 14 t dt
1 / C x 14 t² / 2
= 7 t² / C
= 7 t² / 1 x 10⁻⁶
c ) Let after time t energy stored in capacitor becomes equal the energy stored in capacitance
energy stored in inductor
= 1/2 L I²
energy stored in capacitor
= 1/2 CV²
After time t
1/2 L I² = 1/2 CV²
L I² = CV²
L x ( 14 t )² = C x ( 7 t² / C )²
L x 196 t² = 49 t⁴ / C
t² = CL x 196 / 49
t = 74.8 μ s
After 74.8 μ s energy stored in capacitor exceeds that of inductor.
A wheel is spinning about its axle such that the wheel rotates by 2π radians (1 rev) every 0.43 s. While the wheel spins, the axle is tilted through an angle of π/2 radians (90°) in a time of 0.30 s. The magnitude of the angular momentum changes by 50.00 kg m2/s when the axle is tilted. What is the magnitude of the torque applied to the wheel in order to tilt the axle by 90°?
Answer:
τ = 166.67 N m
Explanation:
The torque is related to the angular momentum
τ = dL / dt
Bold indicates vectors, where tau is the torque and L is the angular momentum
In this case we put the variations, It's like looking for middle values
τ = ΔL / Δt
Let's calculate
τ = 50.00 / 0.30
τ = 166.67 N m
Applied in the direction of rotation at the end of the wheel
You and your friends find a rope that hangs down 16m from a high tree branch right at the edge of a river. You find that you can run, grab the rope, swing out over the river, and drop into the water. You run at 2.0 m/s and grab the rope, launching yourself out over the water. How long must you hang on if you want to drop into the water at the greatest possible distance from the edge?
Answer:
[tex]t = 2\ s[/tex]
Explanation:
given,
length of the rope = 16 m
speed of the man = 2 m/s
using the formula of time period
[tex]T =2 \pi \sqrt{\dfrac{L}{g}}[/tex]
[tex]T =2 \pi \sqrt{\dfrac{16}{9.8}}[/tex]
[tex]T = 8.028\ s[/tex]
To cover the maximum distance you need to leave the when the rope is shows maximum displacement.
To reach the displacement time to leave the rope is one fourth of the time period.
[tex]t = \dfrac{T}{4}[/tex]
[tex]t = \dfrac{8.03}{4}[/tex]
[tex]t = 2\ s[/tex]
The time period of pendulum is time taken by it to complete one cycle of swing left to right and right to left.
The total time taken to hang on if you want to drop into the water at the greatest possible distance from the edge is 2 seconds.
What is time period of pendulum?The time period of pendulum is time taken by it to complete one cycle of swing left to right and right to left.
It can be given as,
[tex]T=2\pi\sqrt{\dfrac{T}{g}}[/tex]
Here, [tex]g[/tex] is the gravitational force of Earth.
Given information-
Total length of the rope is 16 m.
The speed of the man is 2.0 m/s.
Let the time of to swing by rope both side is [tex]T[/tex]. Thus put the values in the above formula as,
[tex]T=2\pi\sqrt{\dfrac{16}{9.8}}[/tex]
[tex]T=8.028 \rm s[/tex]
Now the greatest possible distance from the edge will be at the greatest displacement.
Thus the time to cove the greatest possible distance will be one forth (1/4) of the total time. Thus,
[tex]t=\dfrac{8.028 }{4}\\t=2\rm s[/tex]
Hence, the total time taken to hang on if you want to drop into the water at the greatest possible distance from the edge is 2 seconds.
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In some applications of ultrasound, such as its use on cranial tissues, large reflections from the surrounding bones can produce standing waves. This is of concern because the large pressure amplitude in an antinode can damage tissues. For a frequency of 1.0 MHz, what is the distance between antinodes in tissue?
a. 0.38 mm
b. 0.75 mm
c. 1.5 mm
d. 3.0 mm
Answer:
b. 0.75 mm
Explanation:
The distance between antinodes d is half the wavelength [tex]\lambda[/tex]. We can obtain the wavelength with the formula [tex]v=\lambda f[/tex], where f is the frequency given ([tex]f=1MHz=1\times10^6Hz[/tex]) and v is the speed of sound in body tissues (v=1540m/s), so putting all together we have:
[tex]d=\frac{\lambda}{2}=\frac{v}{2f}=\frac{1540m/s}{2(1\times10^6Hz)}=0.00077m=0.77mm[/tex]
which is very close to the 0.75mm option.
A CD player rotates at a variable speed so that a laser can scan pits and lands on the disk’s bottom surface at a constant tangential speed of 1.2 m/s. The disk has a moment of inertia of 1.2 x 10-4 kg m2and the music is first detected when the laser is located 15 mm from the disk’s center. Assuming the disk started from rest, find the work done by the motor during this start-up.
Answer:
W = 0.384 J
Explanation:
Work and energy in the rotational movement are related
W = ΔK = [tex]K_{f}[/tex] - K₀
W = ½ I [tex]w_{f}[/tex]² - 1 /2 I w₀²
where W isthe work, I is the moment of inertia and w angular velocity
With the system part of the rest the initial angular speed is zero (w₀ = 0)
The angular and linear quantities are related
v = w r
w = v / r
Let's replace
W = ½ I (v / r)²
Let's calculate
W = ½ 1.2 10⁻⁴ 1.2² / (1.5 10⁻²)²
W = 0.384 J
W = 38.4 J
Be sure to answer all parts. Compare the wavelengths of an electron (mass = 9.11 × 10−31 kg) and a proton (mass = 1.67 × 10−27 kg), each having (a) a speed of 6.66 × 106 m/s and (b) a kinetic energy of 1.71 × 10−15 J.
Explanation:
Given that,
(a) Speed, [tex]v=6.66\times 10^6\ m/s[/tex]
Mass of the electron, [tex]m_e=9.11\times 10^{-31}\ kg[/tex]
Mass of the proton, [tex]m_p=1.67\times 10^{-27}\ kg[/tex]
The wavelength of the electron is given by :
[tex]\lambda_e=\dfrac{h}{m_ev}[/tex]
[tex]\lambda_e=\dfrac{6.63\times 10^{-34}}{9.11\times 10^{-31}\times 6.66\times 10^6}[/tex]
[tex]\lambda_e=1.09\times 10^{-10}\ m[/tex]
The wavelength of the proton is given by :
[tex]\lambda_p=\dfrac{h}{m_p v}[/tex]
[tex]\lambda_p=\dfrac{6.63\times 10^{-34}}{1.67\times 10^{-27}\times 6.66\times 10^6}[/tex]
[tex]\lambda_p=5.96\times 10^{-14}\ m[/tex]
(b) Kinetic energy, [tex]K=1.71\times 10^{-15}\ J[/tex]
The relation between the kinetic energy and the wavelength is given by :
[tex]\lambda_e=\dfrac{h}{\sqrt{2m_eK}}[/tex]
[tex]\lambda_e=\dfrac{6.63\times 10^{-34}}{\sqrt{2\times 9.11\times 10^{-31}\times 1.71\times 10^{-15}}}[/tex]
[tex]\lambda_e=1.18\times 10^{-11}\ m[/tex]
[tex]\lambda_p=\dfrac{h}{\sqrt{2m_pK}}[/tex]
[tex]\lambda_p=\dfrac{6.63\times 10^{-34}}{\sqrt{2\times 1.67\times 10^{-27}\times 1.71\times 10^{-15}}}[/tex]
[tex]\lambda_p=2.77\times 10^{-13}\ m[/tex]
Hence, this is the required solution.
which of the following is a measure of disorder or randomness
a. energy
b. temperature
c.heat
d.entropy
Answer:
D. Entropy is a measure of disorder or randomness
Explanation:
The answer is entropy. It is the method to measure any disorder or randomness of any system. Basically it is concept of physics and chemistry but can also be used in other subject matters as well. In formula terms, it is denoted by S and is measurement value is "Joule per kelvin". The values could be both positive and negative as well.
All the other options are incorrect as heat, energy and temperature are the different concepts of science which do not relates with any measurement.
Suppose that the resistance between the walls of a biological cell is 4.2 × 109 Ω. (a) What is the current when the potential difference between the walls is 75 mV? (b) If the current is composed of Na+ ions (q = +e), how many such ions flow in 0.74 s?
Answer:
(a) Current will be [tex]17.857\times 10^{-12}A[/tex]
(b) Number of ions will be [tex]8.258\times 10^6[/tex]
Explanation:
We have given that resistance of the biological cell [tex]R=4.2\times 10^9ohm[/tex]
(a) We have given potential difference of 75 mV
So [tex]V=75\times 10^{-3}volt[/tex]
From ohm's law we know that current is given by
[tex]i=\frac{V}{R}=\frac{75\times 10^{-3}}{4.2\times 10^9}=17.857\times 10^{-12}A[/tex]
(b) We have given time t = 0.74 sec
We have to find the charge
We know that charge is given by Q = it, here i is current and t is time
So charge will be [tex]Q=17.857\times 10^{-12}\times 0.74=13.214\times 10^{-12}C[/tex]
So number of ions will be [tex]n=\frac{13.214\times 10^{-12}}{1.6\times 10^{-19}}=8.258\times 10^6[/tex]
Be sure to answer all parts. In a future hydrogen-fuel economy, the cheapest source of H2 will certainly be water. It takes 467 kJ to produce 1 mol of H atoms from water. What is the frequency, wavelength, and minimum energy of a photon that can free an H atom from water? Enter your answers in scientific notation. Frequency = 7.05 × 10 -32 s−1 Wavelength = 4.26 × 10 -25 m Minimum energy = × 10 kJ/photon
Answer:
[tex]7.7549\times 10{19}\ J[/tex]
[tex]1.17037\times 10^{15}\ Hz[/tex]
[tex]2.56329\times 10^{-7}\ m[/tex]
Explanation:
c = Speed of light = [tex]3\times 10^8\ m/s[/tex]
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}[/tex]
[tex]\nu[/tex] = Frequency
[tex]\lambda[/tex] = Wavelength
The minimum energy is given by
[tex]E=\frac{1\ mol}{N_A}\\\Rightarrow E=467\times 10^{3}\times \frac{1}{6.022\times 10^{23}}\\\Rightarrow E=7.7549\times 10{19}\ J[/tex]
The minimum energy is [tex]7.7549\times 10{19}\ J[/tex]
The energy of a photon is given by
[tex]E=h\nu\\\Rightarrow \nu=\frac{E}{h}\\\Rightarrow \nu=\frac{467\times 10^{3}\frac{1}{6.022\times 10^{23}}}{6.626\times 10^{-34}}\\\Rightarrow \nu=1.17037\times 10^{15}\ Hz[/tex]
The frequency of the photon is [tex]1.17037\times 10^{15}\ Hz[/tex]
Wavelength is given by
[tex]\lambda=\frac{c}{\nu}\\\Rightarrow \lambda=\frac{3\times 10^8}{1.17037\times 10^{15}}\\\Rightarrow \lambda=2.56329\times 10^{-7}\ m[/tex]
The wavelength is [tex]2.56329\times 10^{-7}\ m[/tex]
Speed deamplifier. Block 1 of mass m1 slides along an x axis on a frictionless floor at speed 4.00 m/s. Then it undergoes a onedimensional elastic collision with stationary block 2 of mass m2 = 2.00m1. Next, block 2 undergoes a one-dimensional elastic collision with stationary block 3 of mass m3 = 4.00m1. (a) After all the collisions, what is the speed of block 3?
Answer:
29J
Explanation:
Please see attachment .
: A laser beam is incident on two slits with separation d-0.038 mm. A screen is placed L-1.6 m from the slits. The wavelength of the laser light is A 4750 Å. and θ2 are the angles to the first and second bright fringes above the center of the screen. Otheex ee 25% Part (a) Express sin(91) in terms of d and λ. sin(θ 1) Add V Correct! 25% Part (b) Express sin(92) in terms of d and λ. sin(02) (2 A )yd Correct 25% Part (c) Express the distance between the two bright fringes on the screen, y, in terms of θ1, θ2 and L. Grade S Deductic Potentia 9 cotan(0) cotan(02) in(a)N 4 5 6 cos(0) | (.ilM-17 8 cos(α) cos(φ) Submiss Attempts per detailed sin(φ) tan(6) sin(0) tan(01) Hint I give up! Submit Feedback: deduction per feedback Hints: 0%, deduction per hint. Hints remaining: 2 25% Part (d) Solve for the numerical value of y ¡n meters.
To solve this physics problem involving Young's double-slit experiment, we apply the conditions for constructive interference to determine the angles θ1 and θ2 for the first and second bright fringes. We then use the small angle approximation to determine the distance y between those fringes on the screen. Lastly, we substitute the given values into the formula to compute the numerical value of y.
Explanation:The topic at hand is Young's double-slit experiment, a foundational experiment in wave optics. Given the slit separation d, the laser light's wavelength λ, and the screen's distance L, we need to find the distance between two bright fringes on the screen. The formulas required here stem from the conditions for constructive interference in double-slit set-ups.
Part a) sin(θ1) = λ/d, which is the condition for the light to interfere constructively at the first bright fringe from the center on the screen.
Part b) sin(θ2) = 2λ/d, which gives us the location of the second bright fringe, as it occurs when the path differential is twice the wavelength.
Part c) The distance y between the two bright fringes on the screen can be found using the small angle approximation, which allows us to express the angles θ1 and θ2 in terms of the fringe order m. Thus, y ≈ L*(θ2 - θ1) = L*(2λ/d - λ/d) = L*λ/d.
Part d) Substituting the given values into the formula from Part c, we find y = 1.6m * (4750Å / 0.038mm), which gives us a numerical value once we make sure to convert the units properly. In this case, we need to convert Å to mm by multiplying 4750Å by 10^-4 mm/Å.
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The question is about Young's double-slit experiment in physics. Both θ1 and θ2 are expressed in terms of d (the separation between the slits) and λ (the wavelength of the laser light). The distance between the fringes on the screen is calculated using these variables, resulting in a numerical value in meters.
Explanation:The questions refer to the phenomenon of light diffraction and interference, particularly as it relates to Young's double-slit experiment. In this context, we'll use the formulas defined for this experiment:
For parts (a) and (b): we know that the condition for constructive interference, resulting in bright fringes, for a double-slit setup is given by:
d sin θ = mλ
where 'd' is the slit separation, 'θ' is the angle to the fringe from the central maximum, 'm' is the order of the fringe and 'λ' is the wavelength of the light. For the first fringe (m=1), sin(θ1) = λ/d and for the second fringe (m=2), sin(θ2) = 2λ/d.
For part (c): Considering small angles where tan θ is approximately equal to sin θ, the separation of two bright fringes 'y' on the screen is given by:
y = L (θ2 - θ1) = L λ/d.
For part (d): Now, we just need to substitute the values given into the above formula. Substituting the given values of L = 1.6 m, λ = 4750 Å (which is equivalent to 4750 x 10^-10 m), and d = 0.038 mm (or 0.038 x 10^-3 m), you get:
y = L λ/d ≈ 0.02 m.
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The speed of sound in air is around 345 m/s. A tuning fork vibrates at 850 Hz above the open end of the sound resonance tube. What is the wavelength (in cm) of the sound waves in the tube? Never include units with a numerical answer.
For the development of this problem it is necessary to apply the concepts related to the wavelength depending on the frequency and speed of light.
By definition we know that frequency can be expressed as
[tex]f = \frac{v}{\lambda}[/tex]
Where,
v = Velocity
[tex]\lambda =[/tex] Wavelength
Our values are
[tex]v=345m/sec[/tex]
[tex]f=850Hz[/tex]
Re-arrange to find Wavelength
[tex]f = \frac{v}{\lambda}[/tex]
[tex]\lambda = \frac{v}{f}[/tex]
[tex]\lambda = \frac{345}{850}[/tex]
[tex]\lambda = 0.4058m[/tex]
Converting to centimeters,
[tex]\lambda = 0.4058m(\frac{100cm}{1m})[/tex]
[tex]\lambda = 40.58cm[/tex]
Therefore the wavelength of the sound waves in the tube is 40.58cm
A soccer ball has a mass of 0.40 kg. Initially, it is moving to the left at 20m/s, but then it is kicked and given a velocity of 45 degrees upward and to the right, with a magnitude of 30m/s. Find the impulse of the net force and the average net force, assuming a collision time of .010 seconds.
Answer:
Impulse = 18.53 kg m / s
Net force = 1853N
Explanation:
Mass of the ball, m = 0.4 kg
Initial velocity = 20 m/s horizontally left
Final velocity = 30 m/s at 45 degrees from horizontal
Time of collision = 0.010 s
Check attachment to see full explanation
The impulse and the average net force is 16.484 Ns and 1648.4 N respectively.
To calculate the impulse of the ball, we use the formula below.
Formula:
I = m(v-u).............. Equation 1Where:
I = impulse of the net forcem = mass of the ballu = initial velocity of the ballv = final velocity of the ballFrom the question,
Given:
m = 0.40 kgu = -20 m/s (to the left)v = 30cos45° (to the right) = 21.21 m/s.Substitute these values into equation 1
I = 0.4[21.21-(20)]I = 0.4(21.21+20)I = 0.4(41.21)I = 16.484 Ns.To calculate the average force, we use the formula below.
F = I/t............. Equation 2Where:
F = Average forcet = time.From the question,
Given:
I = 16.484 Nst = 0.01 sSubstitute these values into equation 1
F = 16.484/0.01F = 1648.4 NHence, The impulse and the average net force is 16.484 Ns and 1648.4 N respectively.
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A child is sitting on the seat of a swing with ropes 5 m long. Her father pulls the swing back until the ropes make a 30o angle with the vertical and then releases the swing. If air resistance is neglected, what is the speed of the child at the bottom of the arc of the swing when the ropes are vertical?
Answer:
v = 3.7 m/s
Explanation:
As the swing starts from rest, if we choose the lowest point of the trajectory to be the zero reference level for gravitational potential energy, and if we neglect air resistance, we can apply energy conservation as follows:
m. g. h = 1/2 m v²
The only unknown (let alone the speed) in the equation , is the height from which the swing is released.
At this point, the ropes make a 30⁰ angle with the vertical, so we can obtain the vertical length at this point as L cos 30⁰, appying simply cos definition.
As the height we are looking for is the difference respect from the vertical length L, we can simply write as follows:
h = L - Lcos 30⁰ = 5m -5m. 0.866 = 4.3 m
Replacing in the energy conservation equation, and solving for v, we get:
v = √2.g.(L-Lcos30⁰) = √2.9.8 m/s². 4.3 m =3.7 m/s
It is weigh-in time for the local under-85-kg rugby team. The bathroom scale used toassess eligibility can be described by Hooke’s law and is depressed 0.75 cm byitsmaximum load of 120 kg. (a) What is the spring’s effective spring constant? (b) Aplayer stands on the scales and depresses it by 0.48 cm. Is he eligible to play on thisunder-85-kg team?
To solve this problem it is necessary to apply the equations given in Newton's second law as well as Hooke's Law.
Since Newton's second law we have that force is
F = mg
Where,
m = mass
g = gravity
From the hook law, let us know that
F = -kx
Where
k = Spring constant
x = Displacement
Re-arrange to find k,
[tex]k = -\frac{F}{x}[/tex]
PART A ) We can replace the Newton definitions here, then
[tex]k = -\frac{mg}{x}[/tex]
Replacing with our values we have that
[tex]k = \frac{120*9.8}{-0.75*10^{-2}}[/tex]
[tex]k = 1.57*10^5N/m[/tex]
Therefore the required value of the spring constant is [tex]1.57*10^5N/m[/tex]
PART B) We can also equating both equation to find the mass, then
[tex]mg = -kx[/tex]
[tex]m = \frac{-kx}{g}[/tex]
Replacing with tour values we have
[tex]m = \frac{1.568*10^5(-9.48*10^{-2})}{9.8}[/tex]
[tex]m = 76.8Kg[/tex]
Therefore the mass of the player can be of 76.8Kg, then the player is eligible to play because the mass is less than 85Kg
Final answer:
The spring's effective force constant is 156,800 N/m. The player is eligible to play on the under-85-kg team.
Explanation:
Using Hooke's law, the effective force constant of the spring can be calculated by dividing the maximum load by the displacement. In this case, the spring is depressed by 0.75 cm under a maximum load of 120 kg.
To find the effective force constant, we can use the formula:
F = k * x
Where F is the force, k is the force constant, and x is the displacement.
So, the effective force constant of the spring is:
k = F / x = 120 kg * 9.8 N/kg / 0.0075 m = 156,800 N/m
For part (b), we can use the same formula to determine if the player is eligible to play on the under-85-kg team. Given that the player depresses the spring by 0.48 cm, we can plug in the values to calculate the force:
F = k * x = 156,800 N/m * 0.0048 m = 753.6 N
Since the force exerted by the player is less than 85 kg * 9.8 N/kg, the player is eligible to play on the under-85-kg team.
russell westbrook has a mass of 84.8kg.When jumps to dunk on z 3.04 meter goal,what will be his G.P.E at the apex of his jump?
The gravitational potential energy is 2526 J
Explanation:
The gravitational potential energy (GPE) of an object is the energy possessed by the object due to its position in the gravitational field. Near the Earth's surface, it can be calculated as
[tex]GPE=mgh[/tex]
where
m is the mass of the body
[tex]g=9.8 m/s^2[/tex] is the acceleration of gravity
h is the height of the object
In this problem, we have
m = 84.8 kg
h = 3.04 m
Substituting,
[tex]GPE=(84.8)(9.8)(3.04)=2526 J[/tex]
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A diffraction grating that has 4500 lines/cm is illuminated by light that has a single wavelength. If a second order maximum is observed at an angle of 42° with respect to the central maximum, what is the wavelength of this light?
Answer:
The wavelength is 742.7 nm.
Explanation:
Given that,
Grating = 4500 lines/cm
Angle = 42°
Order number =2
We need to calculate the distance
[tex]d=\dfrac{1\times10^{-2}}{4500}[/tex]
[tex]d=2.22\times10^{-6}\ m[/tex]
We need to calculate the wavelength
Using diffraction formula
[tex]d\sin\theta=m\times\lambda[/tex]
[tex]\lambda=\dfrac{d\sin\theta}{m}[/tex]
[tex]\lambda=\dfrac{2.22\times10^{-6}\times\sin42}{2}[/tex]
[tex]\lambda=7.427\times10^{-7}[/tex]
[tex]\lambda=742.7\ nm[/tex]
Hence, The wavelength is 742.7 nm.
The wavelength of this light was found to be 7.08 × 10⁻⁴ m.
To find the wavelength of light that results in a second-order maximum at a 42° angle when striking a diffraction grating with 4500 lines per centimeter, we use the formula for diffraction grating: d sin θ = mλ, where d is the distance between adjacent grating lines, θ is the angle of the maximum, m is the order of the maximum, and λ is the wavelength of the light. First, calculate the distance between grating lines (d) as the reciprocal of the grating's line density (4500 lines/cm or 4.5×105 lines/m), yielding d = 1/4.5×105 m. Then, substituting the given values into the formula with m = 2 and θ = 42°, solve for the wavelength λ.
λ = (1/4.5×105) * sin(42°) / 2
= 7.08 × 10⁻⁴ m
The magnitude of a component of a vector must be:
a. equal to the magnitude of the vector.
b. greater than or equal to the magnitude of the vector.
c. less than, equal to, or greater than the magnitude of the vector.
d. less than or equal to the magnitude of the vector.
Answer:
(d) Less than or equal to the magnitude of vector
Explanation:
The magnitude of any vector is vector sum of magnitude of its component
As magnitude of vector is sum of its component so magnitude of its component never be greater than the magnitude of vector
It can be equal to the magnitude of vector in one case when the magnitude of other component of the vector is zero
So it can be less or equal to the magnitude of vector
The magnitude of a component of a vector must be less than or equal to the magnitude of the vector.
Explanation:The magnitude of a component of a vector must be less than or equal to the magnitude of the vector.
When a vector is resolved into its components, the magnitude of each component represents the projection of the vector onto that specific axis. The maximum magnitude of any component can be equal to the magnitude of the vector itself, but it cannot exceed it.
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A typical wind turbine extracts 40% of the kinetic energy of the wind that blows through the area swept by the blades. For a large turbine, 110,000 kg of air moves past the blades at 13 m/s every second. If the wind turbine extracts 40% of this kinetic energy, and if 80% of this energy is converted to electric energy, what is the power output of the generator?
Answer:
2.9744 MW
Explanation:
The air blowing through the wind turbine at 110000kg at speed of 13m/s for every second would have the kinetic energy of
[tex]E_k = 0.5mv^2 = 0.5*110000*13^2 = 9295000J/s[/tex]
If the wind turbine is able to extract only 40% of this kinetic energy, and 80% of this is converted to electricity, then the power output of the generator must be
[tex]E = 80\%*40\%*E_k = 0.8*0.4*9295000= 2974400J/s[/tex]
or 2.9744 MegaWatt
The total power output of the wind turbine is calculated by first finding the kinetic energy of the wind, and then determining the amount of that energy that is harvested and converted into electricity. The wind turbine extracts 40% of the kinetic energy, and 80% of this energy is converted into electricity, resulting in a power output of 2.974 gigawatts.
Explanation:To calculate the power output of the generator, we'll first need to compute the kinetic energy of the air moving through the turbine. The equation for kinetic energy is given by: KE = 0.5*mass*velocity^2.
So, the kinetic energy of the air per second is KE = 0.5*110,000 kg*(13 m/s)^2 = 9.295 gigajoules per second. Since the wind turbine extracts 40% of this energy, the energy extracted would be 3.718 gigajoules per second.
Of this extracted energy, 80% is converted to electric energy, which corresponds to 2.974 gigajoules per second. Because power is defined as the energy transferred or converted per unit of time, and here the energy is given per second, the power output is therefore 2.974 gigawatts.
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Two electrons 1 and 2 move along antiparallel paths separated by a distance of 10 nm, traveling at speeds 4.5 x 10^7 m/s and 8.0 x 10^6 m/s.
Part A) What is the magnitude of the magnetic force exerted by electron 2 on electron 1? Express your answer with the appropriate units.
Answer:
The magnetic force on electron 1 by electron 2=[tex]9.22\times 10^{-15} N[/tex]
Explanation:
We are given that
Distance between two electrons=10 nm
Speed of electron 1=[tex]4.5\times 10^7[/tex] m/s
Speed of electron 2=[tex]8.0\times 10^6[/tex] m/s
We have to find the magnitude of the magnetic force exerted by electron 2 on electron 1.
Magnetic force on electron 1 by electron 2
[tex]F=\frac{\mu_0e^2v_1v_2}{4\pi r^2}[/tex]
[tex]\frac{\mu_0}{4\pi}=10^{-7}[/tex]
[tex]e=1.6\times 10^{-19} C[/tex]
[tex]v_1=4.5\times 10^7 m/s[/tex]
[tex]v_2=8.0\times 10^6 m/s[/tex]
[tex]r=10nm=10\times 10^{-9}m[/tex] [tex](1nm=10^{-9} m[/tex])
Substitute the values in the given formula
The magnetic force on electron 1 by electron 2=[tex]\frac{10^{-7}\times (1.6\times 10^{-19})^2\times 4.5\times 10^7\times 8\times 10^6}{(10\times 10^{-9})^2}[/tex]
The magnetic force on electron 1 by electron 2=[tex]9.22\times 10^{-15} N[/tex]
Hence, the magnetic force on electron 1 by electron 2=[tex]9.22\times 10^{-15} N[/tex]
The magnitude of the magnetic force exerted by electron 2 on electron 1 is [tex]9.22\times10^{-15}[/tex] N.
What is magnetic force?Magnetic force is the force of attraction of repulsion between two poles of the two magnets. The magnetic force is also appears between two electrically charged bodies.
The magnetic force can be given as,
[tex]F=\dfrac{\mu_oq_1q_2(v_1v_2)}{4\pi r^2}[/tex]
Here, ([tex]\mu_o[/tex]) is the magnetic constant, (q) is the charge on the body, (v) is the speed of the body and (r) is the distance between them.
The distance between the electrons 1 and 2 is 10 nm. As the speed of the electron 1 is [tex]4.5 \times10^7[/tex] m/s and the speed of the electron 2 is [tex]8.0 \times10^6[/tex] m/s.
Thus, put the values in the above formula as,
[tex]F=\dfrac{4\pi \times10^{-7}\times1.6\times10^{-19}\times1.6\times10^{-19}\times4.5\times10^{7}(8.0\times10^6)}{4\pi (10^{-9})^2}[/tex]
[tex]F=9.22\times10^{-15}\rm N[/tex]
Thus the magnitude of the magnetic force exerted by electron 2 on electron 1 is [tex]9.22\times10^{-15}[/tex] N.
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Two metal spheres of different sizes are charged such that the electric potential is the same at the surface of each. Sphere A has a radius 2 times that of sphere B. Let QA and QB be the charges on the two spheres, and let EA and EB be the electric-field magnitudes at the surfaces of the two spheres.What is the ratio QB/QA?What is the ratio EB/EA?
Answer:
Explanation:
Given
Radius of A is twice of B i.e.
[tex]R_A=2R_B[/tex]
Also Potential of both sphere is same
[tex]V_A=V_B[/tex]
[tex]V=\frac{kQ}{R}[/tex]
thus
[tex]k\frac{Q_A}{R_A}=K\frac{Q_B}{R_B}[/tex]
[tex]\frac{Q_A}{Q_B}=\frac{R_A}{R_B}[/tex]
[tex]\frac{Q_A}{Q_B}=\frac{2}{1}=2[/tex]
[tex]\frac{Q_B}{Q_A}=\frac{1}{2}[/tex]
(b)Ratio of [tex]\frac{E_B}{E_A}[/tex]
Electric Field is given by [tex]E=\frac{kQ}{R^2}[/tex]
thus [tex]E_A=\frac{kQ_A}{R_A^2}[/tex]----1
[tex]E_B=\frac{kQ_B}{R_B^2}[/tex]----2
Divide 2 by 1
[tex]\frac{E_B}{E_A}=\frac{Q_B}{R_B^2}\times \frac{R_A^2}{Q_A}[/tex]
[tex]\frac{E_B}{E_A}=\frac{1}{2}\times 4=2[/tex]
The ratio QB/QA for the charges on the spheres is 2, and the ratio EB/EA for the magnitudes of the electric field at the surfaces of the spheres is 1/2.
Explanation:The question revolves around the principles of electric fields and electric charges on two spherical objects. The spheres in question here are metal and have different sizes, but they hold the same electric potential at their surfaces. This situation is governed by the principles of physics, specifically electrostatics.
To solve this, we begin by noting that the electric potential (V) at the surface of a charged sphere is given by the equation V = KQ/r, where K is Coulomb's constant, Q is the charge on the sphere, and r is the radius of the sphere. Since the potential is the same for both spheres, we get that QA/2R = QB/R. Simplifying, we get the ratio QB/QA = 2.
Next, we calculate the electric field. The electric field (E) at the surface of a charged sphere is given by E = KQ/r^2. Therefore, EA = K×QA/(2R)^2 and EB = K×QB/R^2. Inserting the earlier found ratio of QB/QA = 2, the ratio EB/EA simplifies to 1/2.
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Suppose that instead of a long straight wire, a shortstraight wire was used. The distance from the wire to thepoint that the magnetic field is measured would then be comparableto the length of the short wire. How would you expect themeasured value of the magnetic field to change if the field weresampled at the same distance from each of the two wires?
Answer:
Thus, if field were sampled at same distance, the field due to short wire is greater than field due to long wire.
Explanation:
The magnetic field, B of long straight wire can be obtained by applying ampere's law
[tex]B= \frac{\mu_0 I}{2\pi r}[/tex]
I is here current, and r's the distance from the wire to the field of measurement.
The magnetic field is obviously directly proportional to the current wire. From this expression.
As the resistance of the long cable is proportional to the cable length, the short cable becomes less resilient than the long cable, so going through the short cable (where filled with the same material) is a bigger amount of currents. If the field is measured at the same time, the field is therefore larger than the long wire because of the short wire.
Current flowing in a circuit depends on two variables. Identify these variables and their relationship to current.
Question is Incomplete, Complete question is given below.
Current flowing in a circuit depends on two variables. Identify these variables and their relationship to current.
A) Current is proportionate to the conductance of the circuit and precisely proportional to the voltage applied across the circuit.
B) Current is conversely proportional to the electrical tension of the circuit and corresponds to the resistance across the circuit.
C) Current is inversely proportional to the resistance of the circuit and directly proportional to the voltage applied across the circuit.
D) Current is commensurate to the resistance of the circuit and directly proportional to the electric pressure applied across the circuit.
Answer:
C) Current is inversely proportional to the resistance of the circuit and directly proportional to the voltage applied across the circuit.
Explanation:
Now Ohms Law states that, "So long as a physical state of a conductor remains the potential difference applied to the conductor is directly proportional to current flowing through it."
I ∝ V
V=IR also I=V/R
where R is the Resistance
Hence, From above equation we can say that Current increases when there is increase in Voltage but Current decreases as the resistance decreases.
Hence,Current is inversely proportional to the resistance of the circuit and directly proportional to the voltage applied across the circuit.
A box with a weight of 50 N rests on a horizontal surface. A person pulls horizontally on it with a force of 10 N and it does not move. To start it moving, a second person pulls vertically upward on the box. If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves?
Answer:
25 N
Explanation:
Given that
Weight ,mg = 50 N
m=Mass of the box
g=acceleration due to gravity
Horizontal force F= 10 N
Coefficient of friction ,μ = 0.4
Lets take vertical force = R N
In vertical direction
R + N = mg
N= mg - R
The friction force Fr
Fr= μ N
Fr= μ ( mg - R)
To start the motion
F > Fr
10 > 0.4 ( 50 - R )
25 > 50 - R
R > 50 - 25
R > 25 N
Therefore minimum force R= 25 N
In the given problem, the minimum vertical force required to set the box into motion is greater than 15N. This force reduces the normal force and consequently the frictional force such that it becomes less than the horizontally applied force.
Explanation:In this physical situation, you need to understand the role of static friction and normal force in setting the box into motion. The frictional force is calculated by multiplying the coefficient of static friction (0.4 in this case) and normal force. The normal force on the box is the weight of the box minus the upward force applied. Initially, the upward force is zero, so the frictional force is 0.4 * 50N = 20N. This is greater than the 10N horizontal force applied, so the box does not move.
To make the box move, the vertical force has to reduce the normal force such that the frictional force (which is now less due to the decreased normal force) becomes less than the applied horizontal force (10N). Let's consider the vertical upward force needed as F. Hence, the new frictional force will be 0.4 * (50N - F) and should be less than 10N for the box to move. Solving this inequality, the minimum F needed is >15N, anything above this will make the box move.
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(a) Triply charged uranium-235 and uranium-238 ions are being separated in a mass spectrometer. (The much rarer uranium-235 is used as reactor fuel.) The masses of the ions are 3.90x10—25 kg and 3.95x10—25 kg , respectively, and they travel at 3.00x105 m/s in a 0.250-T field. What is the separation between their paths when they hit a target after traversing a semicircle? (b) Discuss whether this distance between their paths seems to be big enough to be practical in the separation of uranium-235 from uranium-238.
Answer:
(a) 2.5 cm
(b) Yes
Solution:
As per the question:
Mass of Uranium-235 ion, m = [tex]3.95\times 10^{- 25}\ kg[/tex]
Mass of Uranium- 238, m' = [tex]3.90\times 10^{- 25}\ kg[/tex]
Velocity, v = [tex]3.00\times 10^{5}\ m/s[/tex]
Magnetic field, B = 0.250 T
q = 3e
Now,
To calculate the path separation while traversing a semi-circle:
[tex]\Delta x = 2(R_{U_{35}} - 2R_{U_{38}})[/tex]
The radius of the ion in a magnetic field is given by:
R = [tex]\frac{mv}{qB}[/tex]
[tex]\Delta x = 2(R_{U_{35}} - 2R_{U_{38}})[/tex]
[tex]\Delta x = 2(\frac{mv}{qB} - \frac{m'v}{qB})[/tex]
[tex]\Delta x = 2(\frac{m - m'}{qB}v)[/tex]
Now,
By putting suitable values in the above eqn:
[tex]\Delta x = 2(\frac{3.95\times 10^{- 25} - 3.90\times 10^{- 25}}{3\times 1.6\times 10^{- 19}\times 0.250}\times 3.00\times 10^{5}) = 2.5\ cm[/tex]
[tex]\Delta x = 1.25\ cm[/tex]
(b) Since the order of the distance is in cm, thus clearly this distance is sufficiently large enough in practical for the separation of the two uranium isotopes.
In a mass spectrometer, uranium-235 and uranium-238 ions can be separated based on their masses and velocities. The separation distance between their paths can be determined using the equation: d = mv/(qB). The distance between their paths is practical for the separation of uranium-235 from uranium-238.
Explanation:In a mass spectrometer, triply charged uranium-235 and uranium-238 ions are separated based on their masses and velocities.
The separation of their paths when they hit a target after traversing a semicircle can be calculated using the equation:
d = mv/(qB)
where d is the separation, m is the mass of the ion, v is the velocity, q is the charge, and B is the magnetic field.
The distance between their paths seems to be big enough to be practical in the separation of uranium-235 from uranium-238, as even a small separation can result in significant enrichment over multiple passes through the mass spectrometer.
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which of the following tends to increase in a system?
A. temperature
B. Heat
C. Entropy
D. Energy
Answer: entropy
Explanation: entropy is the degree of disorderliness or randomness in a system
The hollow tube is pivoted about a horizontal axis through point O and is made to rotate in the vertical plane with a constant counterclockwise angular velocity = 2.9 rad/sec. If a 0.15-lb particle is sliding in the tube toward O with a velocity of 4.8 ft/sec relative to the tube when the position θ = 36° is passed, calculate the magnitude N of the normal force exerted by the wall of the tube on the particle at this instant.
To solve the problem it is necessary to apply the concepts related to Newton's second law, as well as to the sum of forces in this type of bodies.
According to the description I make a diagram that allows a better understanding of the problem.
Performing sum of forces in the angular direction in which it is inclined we have to
[tex]\sum F = ma_{\theta}[/tex]
[tex]N - W cos\theta = ma_{\theta}[/tex]
[tex]N = ma_{\theta}+Wcos\theta[/tex]
Tangential acceleration can be expressed as
[tex]a_{\theta} = (r\ddot{\theta}+2\dot{r}\dot{\theta})[/tex]
Our values are given by,
[tex]\dot{\theta} = 2.9rad/s[/tex]
[tex]m = 0.15 lb[/tex]
[tex]\theta = 36\°[/tex]
[tex]v = 4.8ft/s[/tex]
Substituting [tex]\ddot{\theta}=0rad/s^2 , \dot{r}=-4.8ft/s, \dot{\theta}=2.9 rad/s[/tex]
[tex]a_{\theta} = r*0+2*(4.8*2.9)\\a_{\theta}=27.84ft/s^2[/tex]
At the same time we acan calculate the mass of the particle, then
W = mg
Where,
W = Weight of the particle
m = mass
g = acceleration due to gravity
[tex]0.15lb = m(32.2ft/s^2)[/tex]
[tex]m = 4.66*10^{-3}Lb[/tex]
Now using our first equation we have that
[tex]N = ma_{\theta}+Wcos\theta[/tex]
[tex]N = (4.66*10^{-3})(27.84)+0.2cos36[/tex]
[tex]N = 0.2914Lb[/tex]
Therefore the normal force exerted by the wall of the tube on the particle at this instant is 0.2914Lb
The magnitude of the normal force [tex]\( N \)[/tex] exerted by the wall of the tube on the particle at the instant when the angle [tex]\( \theta = 36^\circ \)[/tex] is approximately 0.249 lb
To determine the normal force [tex]\( N \)[/tex]exerted by the wall of the tube on the particle, we analyze the forces acting on the particle in a rotating reference frame. Here’s the step-by-step process:
1. Identify the given data:
- Angular velocity [tex]\( \omega = 2.9 \)[/tex] rad/sec
- Particle weight [tex]\( W = 0.15 \)[/tex] lb
- Relative velocity towards O [tex]\( v_r = 4.8 \)[/tex] ft/sec
- Angle [tex]\( \theta = 36^\circ \)[/tex]
2. **Convert the weight to mass:**
-[tex]\( W = mg \)[/tex]
-[tex]\( m = \frac{W}{g} \)[/tex]
- Using[tex]\( g = 32.2 \text{ ft/sec}^2 \)[/tex]:
- [tex]\( m = \frac{0.15 \text{ lb}}{32.2 \text{ ft/sec}^2} = 0.00466 \text{ slugs} \)[/tex]
3. Calculate the distance ( r ):
- Since [tex]\( v_r = 4.8 \)[/tex] ft/sec is towards O and the tube is rotating with [tex]\( \omega \),[/tex] the distance [tex]\( r \)[/tex] can be found using [tex]\( r = \frac{v_r}{\omega} \)[/tex]:
- [tex]\( r = \frac{4.8 \text{ ft/sec}}{2.9 \text{ rad/sec}} = 1.655 \text{ ft} \)[/tex]
4. **Determine the forces:**
- Centrifugal force [tex]\( F_c = m \omega^2 r \)[/tex]:
[tex]\[ F_c = 0.00466 \text{ slugs} \times (2.9 \text{ rad/sec})^2 \times 1.655 \text{ ft} = 0.0638 \text{ lb} \][/tex]
- Component of gravitational force in the radial direction [tex]\( F_{g, r} = W \cos \theta \)[/tex]:
[tex]\[ F_{g, r} = 0.15 \text{ lb} \times \cos 36^\circ = 0.1214 \text{ lb} \][/tex]
5. Calculate the normal force [tex]\( N \)[/tex]:
- Normal force [tex]\( N \)[/tex] must balance the radial forces:
[tex]\[ N = F_c + F_{g, r} + m \cdot (\omega^2 r) \][/tex]
[tex]\[ N = 0.0638 \text{ lb} + 0.1214 \text{ lb} + 0.0638 \text{ lb} \][/tex]
[tex]\[ N = 0.249 \text{ lb} \][/tex]