The speed of the ping-pong ball must be 97.8 m/s
Explanation:
The kinetic energy of an object is the energy possessed by an object due to its motion. It is calculated as
[tex]E_k = \frac{1}{2}mv^2[/tex]
where
m is the mass of the object
v is its speed
Here we have a bowling ball that has
Mass: m = 7.29 kg
Speed: v = 1.73 m/s
So its kinetic energy is
[tex]E_k = \frac{1}{2}(7.29)(1.73)^2=10.9 J[/tex]
Now we want the ping-pong ball to have the same kinetic energy, so
[tex]E_k = 10.9 J[/tex]
its mass is
[tex]m=2.28 g = 2.28\cdot 10^{-3} kg[/tex]
So, we can find the speed it should have by re-arranging the equation:
[tex]v=\sqrt{\frac{2E_k}{m}}=\sqrt{\frac{2(10.9)}{2.28\cdot 10^{-3}}}=97.8 m/s[/tex]
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A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1.33 x 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the density of the solution is 1.02 x 103 kg/m3 .
Answer:
The height of the bag will be 0.133 m
Explanation:
We have given gauge pressure [tex]P=1.33\times 10^3Pa=1330Pa[/tex]
Density of solution [tex]\rho =1.02\times 10^3=1020kg/m^3[/tex]
We have to find the height of the bag
We know that gauge pressure is given by P=\rho gh
[tex]1330=1020\times 9.8\times h[/tex]
h=0.133m
So the height of the bag will be 0.133 m
Final answer:
The minimum height of the bag should be 0.245 meters to infuse glucose into the vein.
Explanation:
In order for the fluid to enter the vein, its pressure at entry must exceed the blood pressure in the vein. To find the height of the fluid, we need to convert the blood pressure in mm Hg to SI units. Since 1.0 mm Hg = 133 Pa, the blood pressure in the vein is 18 mm Hg above atmospheric pressure, which is equivalent to (18 mm Hg)(133 Pa/mm Hg) = 2386 Pa.
Now we can calculate the height of the fluid using the formula:
h = P/(ρg)
Where:
h is the height of the fluidP is the gauge pressure (2386 Pa)ρ is the density of the solution (1.02 x 10^3 kg/m^3)g is the acceleration due to gravity (9.8 m/s^2)Substituting the given values into the formula, we find:
h = (2386 Pa)/((1.02 x 10^3 kg/m^3)(9.8 m/s^2)) = 0.245 m
The minimum height of the bag should be 0.245 meters in order to infuse glucose into the vein.
A dolphin in seawater at a temperature of 25°C emits a sound wave directed toward the ocean floor 154 m below. How much time passes before it hears an echo? (The speed of sound in ocean water is 1533 m/s.)
Answer:
0.2s
Explanation:
SO for the dolphin to hear its echo, the sound wave must travel a distance twice as much as the displacement between the dolphin and the ocean floor. So d = 154 * 2 = 308 m
Since the speed of sound in ocean floor is v = 1533m/s we can find out the time by dividing the distance d by the speed of sound
t = d / v = 308 / 1533 = 0.2s
[tex](t = d / v )[/tex]The time passes before it hears an echo is 0.3secs
What is sound wave?A sound wave servers patterns of disturbance caused by the movement of energy traveling through a medium.
The speed of sound in ocean floor was given as [tex]( v = 1533m/s)[/tex]
To find the time, we can make use if the formula
[tex](t = d / v )[/tex]
Where t= time
v= velocity
d= distance
Then substitute ,we have
[tex]= 308 / 1533 = 0.2s[/tex]
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Two ice skaters collide on the ice. A 39.6-kg skater moving South at 6.21 m/s collides with a 52.1-kg skater moving East at 4.33 m/s. The two skaters entangle and move together across the ice. Determine the magnitude and direction of their post-collision velocity.
Answer:
V = 3.6385 m/s
θ = 47.46 degrees
Explanation:
the important data in the question is:
Skater 1:
[tex]M_1[/tex]= 39.6 kg
direction: south (axis y)
[tex]V_{1iy}[/tex] = 6.21 m/s
Skater 2:
[tex]M_2[/tex] = 52.1 kg
direction: east (axis x)
[tex]V_{2ix}[/tex] = 4.33 m/s
Now using the law of the conservation of linear momentum ( [tex]P_i = P_f[/tex] and knowing that the collision is inelastic we can do the next equations:
[tex]M_{1}V_{1ix}+M_2V_{2ix} = V_{sx}(M_1+M_2)[/tex] (eq. 1)
[tex]M_{1}V_{1iy}+M_2V_{2iy} = V_{sy}(M_1+M_2)[/tex] (eq. 2)
Where [tex]V_{sx}[/tex] and [tex]V_{sy}[/tex] is the velocity of the sistem in x and y after the collision.
Note: the conservation of the linear momentum have to be make once by each axis.
Now, in the (eq. 1) the skater 1 don't have velocity in the axis x, so we can replace [tex]V_{1ix}[/tex] by 0 in the equation and get:
[tex]M_2V_{2ix} = V_{sx}(M_1+M_2)[/tex] (eq. 1)
also, in the (eq. 2) the skater 2 don't have velocity in the axis y, so we can replace [tex]V_{2iy}[/tex] by 0 in the equation and get:
[tex]M_{1}V_{1iy} = V_{sy}(M_1+M_2)[/tex] (eq. 2)
Now, we just replace the data in both equations:
[tex](52.1)(4.33) = V_{sx}(39.6+52.1)[/tex] (eq. 1)
[tex](39.6)(6.21) = V_{sy}(39.6+52.1)[/tex] (eq. 2)
solving for [tex]V_{sx][/tex] and [tex]V_{sy}[/tex] we have:
[tex]V_{sx][/tex] = 2.46 m/s
[tex]V_{sy][/tex] = 2.681 m/s
using the pythagoras theorem we can find the magnitude of the velocity as:
V = [tex]\sqrt{2.46^2+2.681^2}[/tex]
V = 3.6385 m/s
For find the direction we just need to do this;
θ = [tex]tan^{-1}(\frac{2.681}{1.46})[/tex]
θ = 47.46 degrees
While a star is on the main sequence, its equilibrium is the result of the outward pressure of hot gas and the inward pressure of ________.
Answer:
Gravity
Explanation:
While a star is on the main sequence, its equilibrium is the result of the outward pressure of hot gas and the inward pressure of GRAVITY.
Gravity is a property of mass of objects. Pressure gravity is the resultant force felt by a particular mass object.
As gravity contact the star surface, density gradient is set up.
Pressure of gravity is a gravitational compression which increases the objects density, compresses the mass of objects and reduces the object's size.
A star might leave the sequence if the star run out of fuel for nuclear fusion in its core.
The Bernoulli equation is valid for steady, inviscid, incompressible flows with a constant acceleration of gravity. Consider flow on a planet where the acceleration of gravity varies with height so that g=g0−cz, where g0 and c are constants. Integrate "F=ma" along a streamline to obtain the equivalent of the Bernoulli equation for this flow.
Answer:
[tex]p+\frac{1}{2}ρV^{2}+ρg_{0}z-\frac{1}{2}ρcz^{2}=constant[/tex]
Explanation:
first write the newtons second law:
F[tex]_{s}[/tex]=δma[tex]_{s}[/tex]
Applying bernoulli,s equation as follows:
∑[tex]δp+\frac{1}{2} ρδV^{2} +δγz=0\\[/tex]
Where, [tex]δp[/tex] is the pressure change across the streamline and [tex]V[/tex] is the fluid particle velocity
substitute [tex]ρg[/tex] for {tex]γ[/tex] and [tex]g_{0}-cz[/tex] for [tex]g[/tex]
[tex]dp+d(\frac{1}{2}V^{2}+ρ(g_{0}-cz)dz=0[/tex]
integrating the above equation using limits 1 and 2.
[tex]\int\limits^2_1 \, dp +\int\limits^2_1 {(\frac{1}{2}ρV^{2} )} \, +ρ \int\limits^2_1 {(g_{0}-cz )} \,dz=0\\p_{1}^{2}+\frac{1}{2}ρ(V^{2})_{1}^{2}+ρg_{0}z_{1}^{2}-ρc(\frac{z^{2}}{2})_{1}^{2}=0\\p_{2}-p_{1}+\frac{1}{2}ρ(V^{2}_{2}-V^{2}_{1})+ρg_{0}(z_{2}-z_{1})-\frac{1}{2}ρc(z^{2}_{2}-z^{2}_{1})=0\\p+\frac{1}{2}ρV^{2}+ρg_{0}z-\frac{1}{2}ρcz^{2}=constant[/tex]
there the bernoulli equation for this flow is [tex]p+\frac{1}{2}ρV^{2}+ρg_{0}z-\frac{1}{2}ρcz^{2}=constant[/tex]
note: [tex]ρ[/tex]=density(ρ) in some parts and change(δ) in other parts of this equation. it just doesn't show up as that in formular
Three thermometers are in the same water bath. After thermal equilibrium is established, it is found that the Celsius thermometer reads 0 °C, the Fahrenheit thermometer reads 12°F, and the Kelvin thermometer reads 273 K. Which one of the following statements is the most reasonable conclusion?
a) the Kelvin thermometer is incorrect
b) the Celsius thermometer is incorrect
c) the Fahrenheit thermometer is incorrect
d) the three thermometers are all at different temperatures
Answer:
C) the Fahrenheit thermometer is incorrect
Explanation:
Since
1) K = °C + 273
2) °F = 9/5 °C + 32
for 0 °C
1) K = 0°C + 273 = 273 K
2) °F = 9/5 * 0°C + 32 = 32 °F
Thus the Kelvin thermometer measurement coincides with the Celsius measurement but not with the °F . On the other hand, if the Fahrenheit measurement is right, the Celsius thermometer and the Kelvin one should be wrong.
Therefore is more reasonable to assume that one thermometer failed (the one of Fahrenheit and both Kelvin and Celsius are right ) that 2 thermometers ( Celsius and Kelvin thermometers fail and the one of Fahrenheit is right)
For the three thermometers, we see that one thermometer failed and 2 are right,, Hence the Fahrenheit thermometer is incorrect
Option C is correct
What is ?
Generally, the equation for finding Kelvin is mathematically given as
K = °C + 273
Where
°F = 9/5 °C + 32
In conclusion, The Kelvin thermometer measurement relates with Celsius measurement but has no direct link with Fahrenheit F, the Fahrenheit thermometer is incorrect
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Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 25.0 kg and that of the boat is 30.0 kg . (Take the package's direction of motion as positive.)
Answer:
V = -0.8 m/s
Explanation:
given,
mass of the child (m)= 25 Kg
mass of the boat(M) = 30 Kg
velocity of boat = ?
Assuming Boys throws package of mass(m₁) 6 Kg at the horizontal speed of 10 m/s
using conservation of momentum
(M + m + m₁) V = (M+ m)V + m₁ v
initial velocity V = 0 m/s
(M + m + m₁) x 0 = (M+ m)V + m₁ v
0 = (25+50)V + 6 x 1 0
75 V = -60
V = -0.8 m/s
negative direction shows that velocity in the direction opposite to the motion of package.
Final answer:
The velocity of the boat immediately after, assuming it was initially at rest, is 15.8 m/s.
Explanation:
To calculate the velocity of the boat, we can use vector addition. The boat's velocity relative to the water is perpendicular to the river's velocity. We can use the Pythagorean theorem to find the magnitude of the boat's velocity:
Vboat = sqrt((Vriver)2 + (Vboat)2)
Substituting the given values, we get:
Vboat = sqrt((5.0 m/s)2 + (15.0 m/s)2) = 15.8 m/s
Therefore, the velocity of the boat immediately after is 15.8 m/s.
rickey approaches third base. He dives head first, hitting the ground at 6.75 m/s and reaching the base at 5.91 m/s in 2.5 seconds. Determine the distance Rickey slides across the ground before touching the base.
Answer:
15.825 m
Explanation:
t = Time taken = 2.5 s
u = Initial velocity = 6.75 m/s
v = Final velocity = 5.91 m/s
s = Displacement
a = Acceleration
Equation of motion
[tex]v=u+at\\\Rightarrow a=\frac{v-u}{t}\\\Rightarrow a=\frac{5.91-6.75}{2.5}\\\Rightarrow a=-0.336\ m/s^2[/tex]
[tex]v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{5.91^2-6.75^2}{2\times -0.336}\\\Rightarrow s=15.825\ m[/tex]
The distance Rickey slides across the ground before touching the base is 15.825 m
Transform boundaries are classified under which type of fault?
Answer:
Strike-slip fault
Explanation:
Transform boundaries play the role of connecting the other plate boundary segments.
When the plates are rubbed against each other, they result in enormous amount of stresses which leads to the breaking of the part of a rock causing earthquakes. Places of occurrence of these breaks are termed as faults.
Strike slip faults results from compression which takes place horizontally, but but in this the rock displacement releases energy and takes place in a horizontal direction which is parallel to the force of compression.
Transform boundaries are classified under Transform Faults, where plates slide past each other causing stress and earthquakes, such as at the San Andreas Fault.
Explanation:Transform boundaries are classified under the type of fault known as Transform Faults. These happen at plate boundaries where the plates are not moving away or toward each other, but instead sliding past one another. This movement causes a huge amount of stress, leading to earthquakes. The most recognized transform fault is the San Andreas Fault in California, where the Pacific Plate and the North American Plate are sliding past each other.
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This is the body of law that codifies what a state defines as legal and/or illegal as well as the punishments for the violations of the laws.
Answer:
Criminal Law
Explanation:
Criminal Law is the body of law that codifies what a state defines as legal and/or illegal as well as the punishments for the violations of the laws. Examples of Criminal laws are murder, assault, theft, or drunken driving. Under criminal comes that procedure of prosecution of individual who commit crime. It is different from the civil law.
Answer:
Criminal Law is the body of law that codifies what a state defines as legal and/or illegal as well as the punishments for the violations of the laws. Examples of Criminal laws are murder, assault, theft, or drunken driving. Under criminal comes that procedure of prosecution of individual who commit crime. It is different from the civil law.
nder some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. The density of a neutron star is roughly 1014 times as great as that of ordinary solid matter. Suppose we represent the star as a uniform, solid, rigid sphere, both before and after the collapse. The star's initial radius was 6.0×105 km (comparable to our sun); its final radius is 16 km.If the original star rotated once in 35 days, find the angular speed of the neutron star.
Answer:
2.92 * 10³ rad/s
Explanation:
Given:
Initial Radius of Original Star (Ri) = 6.0 * 10^5 km
Final Radius of Neutron Star (Rf) = 16km
Angular Speed = 1 revolution in 35 days
We need to convert this to rad/s
To do that, we first convert to rad/day
i.e (1 rev/35 days) * (2π rad/ 1 rev)
We then convert the days to hour
i.e. (1 rev / 35 days) * (2π rad/ 1 rev) * (1 day / 24 hours)
Finally, we convert the hour to seconds (3600 seconds makes an hour)
i.e. (1 rev / 35 days) * (2π rad/ 1 rev) * (1 day / 24 hours) * (1 hour/ 3600 sec)
Angular Speed = 2π rad/ 3024000 secs
Angular Speed (wi) = 2.079 * 10^-6rad/s
From the question, we're asked to calculate the angular speed of the neutron star (wf)
Applying law of conservation of angular momentum to a system whose moment of Inertia changes, we have
Ii*wi = If * wf ----------------- Formula
Where Ii and If are the initial and final Inertia of the star
The relationship between Inertia and Radius of each object is I = 2/5MR²
So, Ii = 2/5(MRi²) and If = 2/5(MRf²)
Substitute the above in the formula quoted
We have 2/5(MRi²)wi = 2/5(MRf²)wf ---------------- Divide through by 2M/5
We are left with, Ri²wi = Rf²wf
Make wf the subject of the formula
wf = wi * (Ri/Rf)²
wf = 2.079 * 10^-6rad/s * (6.0 * 10^5 km/16km)²
wf = 2.079 * 10^-6rad/s * (6.0 * 10^5 km/16km) * (6.0 * 10^5 km/16km)
wf = 2.92 * 10³ rad/s
Each second, 1250 m3 of water passes over a waterfall 150 m high. Three-fourths of the kinetic energy gained by the water in falling is transferred to electrical energy by a hydroelectric generator. At what rate does the generator produce electrical energy? (The mass of 1 m3 of water is 1000 kg.)
Answer:
The generator produces electrical energy at a rate of 1378125000 J per second.
Explanation:
volume of water falling each second is 1250 [tex]m^{3}[/tex]
height through which it falls, h is 150 m
mass of 1 [tex]m^{3}[/tex] of water is 1000 kg
⇒mass of 1250 [tex]m^{3}[/tex] of water, m = 1250×1000 = 1250000 kg
acceleration due to gravity, g = 9.8 [tex]\frac{m}{sec^{2} }[/tex]
in falling through 150 m in each second, by Work-Energy Theorem:
Kinetic Energy(KE) gained by it = Potential Energy(PE) lost by it
⇒KE = mgh
= 1250000×9.8×150 J
= 1837500000 J
Electrical Energy = [tex]\frac{3}{4}[/tex](KE)
= [tex]\frac{3}{4}[/tex]×1837500000
= 1378125000 J per second
Two wheels having the same radius and mass rotate at the same angular velocity ((Figure 1) ). One wheel is made with spokes so nearly all the mass is at the rim. The other is a solid disk.How do their rotational kinetic energies compare?A. The wheel with spokes has higher KE, but not twice as high.B. They are nearly the same.C. The solid wheel has higher KE, but not twice as high.D. The solid wheel has about twice the KE.E. The wheel with spokes has about twice the KE.
Answer:
E. The wheel with spokes has about twice the KE.
See explanation in: https://quizlet.com/100717504/physics-8-mc-flash-cards/
Answer:
Explanation:
We have to consider how the location of the mass affects the moment of inertia.
For a solid cylinder, I = mR²
For a hollow cylinder, I = 1/2mR²
Where
I ist the moment of inertia,
m is their masses,
R is the radius of rotation.
Since they have the same mass and radius, it can be seen that a hollow cylinder has twice the moment of inertia as a solid cylinder of the same mass and radius.
We know that the rotational kinetic energy is proportional to the moment of inertia. From;
Rotational KE = 1/2IW²
Where W is the angular speed.
so that at the same angular speed, the wheel with the spokes will have about double the kinetic energy as the solid cylinder. Take note that some of the mass is in the spokes so the moment of inertia is not exactly double.
When an electron de-excites from the third quantum level to the second, and then to the ground state, two photons are emitted. The sum of the emitted frequencies equals the frequency of the single-photon that would be emitted if de-excitation were from the third to ____.
Answer:
ground state
Explanation:
Lets take
n=3 ,n=2 ,n=1 are the energy level.
Energy level n=1 is the ground energy level.
The energy from 3 to 1 = hν
The energy from 3 to 2 = hν₁
The energy from 2 to 1 = hν₂
We can say that
hν = hν₁ + hν₂
If the electron were de-excitation from the third level to ground level then the sum of emitted frequency will be equal to the frequency of a single electron.
Therefore the answer is ground state.
At what displacement of a sho is the energy half kinetic and half potential?
Answer:
Displacement = 0.707A
Explanation:
To solve for the displacement we know that
Potential energy PE = 1/2Total energy (Etotal)
Therefore 1/2kx^2 = 1/2(1/2KA^2)
Solving for x we have
x^2 = √A^2/2
x = A/√2
x= 0.707A
A 75.5-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 3.38 x 10-2 m3 and is completely submerged under the water. The volume of the person's body that is underwater is 6.42 x 10-2 m3. What is the density of the life jacket?
Answer:
Density of jacket will be [tex]680.4733kg/m^3[/tex]
Explanation:
We know that weight of water displaced= buoyant force=weight of man
Now volume of water displaced [tex]v=3.38\times 10^{-2}+6.42\times 10^{-2}=9.8\times 10^{-2}m^3[/tex]
Density of water [tex]d=100kg/m^3[/tex]
So weight of water displaced [tex]=9.8\times 10^{-2}\times 1000=98kg[/tex]
So weight of jacket = 98-75 = 23 kg
We have given volume of the jacket = [tex]3.38\times 10^{-2}m^3[/tex]
So density of jacket [tex]=\frac{mass}{volume}=\frac{23}{3.38\times 10^{-2}}=680.4733kg/m^3[/tex]
Two platoons line up for a tug of war. If both platoons have the same number of participants on a team, what other factor is critical to either platoon's win?
A. age of men
b. height of men
c. total mass of the team
d. condition of the ground
Answer:
option (c)
Explanation:
In the game of tug of war, the Newton's third law is obeyed.
One team pulls the rope in one direction and the other team pulls the rope in another direction.
As the mass of one team is more, so it is harder to pull the rope by the another team.
So, it depends on the total mass of the team.
Option (c) is correct.
Answer:
The best answer would be C. Total mass of the team.
Explanation:
C would be the best answer because when looking in the formula of force then the 2 factors that are inputted are mass and acceleration but in this case acceleration would most likely not have much have an effect so that leaves the factor of mass.
Hope this helped!
A rocket ship starts from rest in turns on it's forward booster rocket causing it to have a constant acceleration of 4m/s*rightward. After 3s, what will be the velocity of the rocket ship
The velocity after 3 s is 12 m/s rightward
Explanation:
The motion of the rocket is a motion at constant acceleration, therefore we can apply suvat equations:
[tex]v=u+at[/tex]
where
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time interval
For the rocket in this problem:
u = 0 (the rocket starts from rest)
t = 3 s
[tex]a=4 m/s^2[/tex] rightward is the acceleration
Solving for v, we find the final velocity:
[tex]v=0+(4)(3)=12 m/s[/tex] (rightward)
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A potter's wheel (a solid, uniform disk) of mass 7.0 kg and .65 m radius spins about its central axis. A 2.1 kg lump of clay is dropped onto the wheel at a distance .41 m from the axis. Calculate the rotational inertia of the system.
a. 2.5 kg · m2
b. 1.8 kg · m2
c. 1.5 kg · m2
d. 0.40 kg · m2
Answer:
The rotational inertia of the system is 1.8 kg.m².
(b) is correct option.
Explanation:
Given that,
Mass of disk = 7.0 kg
Radius = 0.65 m
Mass of clay = 2.1 kg
Distance = 0.41 m
We need to calculate the rotational inertia of the system
Using formula of rotational inertia
[tex]I''=I+I'[/tex]
Where, I= the moment of inertia of a solid disk
I'=the moment of inertia of lump of clay
Put the value into the formula
[tex]I=\dfrac{MR^2}{2}+mr^2[/tex]
[tex]I=\dfrac{1}{2}\times7.0\times(0.65)^2+2.1\times0.41^2[/tex]
[tex]I=1.8\ kg.m^2[/tex]
Hence, The rotational inertia of the system is 1.8 kg.m².
Radio Waves If your favorite FM radio station broadcasts at a frequency of 104.5 MHz, what is the wavelength of the station’s signal in meters? What is the energy of a photon of the station’s electromagnetic signal?
Answer:
The wavelength of the station’s signal is 2.9 meters
The energy of a photon of the station’s electromagnetic signal is [tex]6.9\times10^{-26}J [/tex]
Explanation:
Wavelength [tex] \lambda [/tex] is inversely proprtional to frequency (f) and directly proportional to velocity of the wave (v).
[tex]\lambda=\frac{v}{f} [/tex] (1)
But electromagnetic waves as radio signals travel at speed of light so using this on (1):
[tex]\lambda=\frac{c}{f}=\frac{3.0\times10^{8}}{104.5\times10^{6}}\approx2.9\,m [/tex]
Albert Einstein discovered that energy of electromagnetic waves was quantized in small discrete packages of energy called photons with energy:
[tex] E=hf=(6.6\times10^{-34})(104.5\times10^{6})\approx6.9\times10^{-26}J[/tex]
with h the Planck's constant.
The wavelength of a 104.5 MHz FM radio signal is approximately 2.87 meters, and the energy of a photon of this radio signal is approximately 6.92 * 10^-26 Joules.
Explanation:The subject of this question is the relationship between the frequency, wavelength, and energy of radio waves, specifically those used in FM radio broadcasting.
To calculate the wavelength of the radio signal, one can employ the wave equation: velocity = frequency * wavelength. Since the velocity of electromagnetic waves, which include radio waves, is the speed of light (3 * 10^8 m/s), the wavelength can be obtained by rearranging the equation to: wavelength = velocity / frequency. Using your FM station's frequency of 104.5 MHz (or 104.5 * 10^6 Hz), the wavelength of the station's signal would be approximately 2.87 meters.
The energy of a photon from this radio signal could be found through the photon energy equation: E = h * f, where h is Planck's constant (6.62607004 × 10^-34 m^2 kg / s) and f is the frequency in Hz. Thus, the energy of a radio signal photon at 104.5 MHz would be approximately 6.92 * 10^-26 J.
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Blaise Pascal duplicated Torricelli's barometer using a red Bordeaux wine of density 965 kg/m3 as the working liquid (see figure below).
1. What was the height h of the wine column for normal atmospheric pressure?
2. Would you expect the vacuum above the column to be as good as that for mercury?
A. Yes
B. No
Answer:
a) h=10.701m
b) No. On this case a liquid like wine is not good as the mercury, because the wine is composed of water, alcohol and other elements, but specially the alcohol evaporates much easier than the mercury, and that will cause malfunction in the vacuum of the baroemter used for the experiment.
Explanation:
The Torricelli's experiment "was invented by the Italian scientist Evangelista Torricelli and the most important purpose of this experiment was to prove that the source of vacuum comes from atmospheric pressure"
Pressure is defined as "the force that is applied on any object in the direction perpendicular to the surface of the object in the unit area is known as the pressure. There are various types of pressure".
Part a
We have the density for the red Bordeaux wine given [tex]\rho=965\frac{kg}{m^3}[/tex], the atmospheric pressure on the Toriccelli's barometer is given by:
[tex]P_{atm}=\rho g h[/tex]
Solving for the height of wine in the column we have this:
[tex]h=\frac{P_{atm}}{\rho g}[/tex]
And replacing we have:
[tex]h=\frac{101300Pa}{965\frac{kg}{m^3} 9.81\frac{m}{s^2}}=10.701 m[/tex]
So the height of the red Bordeaux wine would be h=10.701m. A very high value on this case if we compare with the usual values for this variable.
Part b
No. On this case a liquid like wine is not good as the mercury, because the wine is composed of water, alcohol and other elements, but specially the alcohol evaporates much easier than the mercury, and that will cause malfunction in the vacuum of the baroemter used for the experiment.
The height of the wine column for normal atmospheric pressure can be calculated using the equation P = ρgh. The vacuum above the column in the wine barometer would not be as good as that for mercury. The correct answer is No (B).
Explanation:The height h of the wine column for normal atmospheric pressure can be calculated using the equation P = ρgh, where P is the atmospheric pressure, ρ is the density of the liquid, g is the acceleration due to gravity, and h is the height of the column. The atmospheric pressure can be taken as P = 101325 Pa and the acceleration due to gravity is approximately g = 9.8 m/s^2. Plugging in these values and the density of the wine, ρ = 965 kg/m^3, we can solve for h. Hence, h = P / (ρg).
To compare the vacuum above the column in the wine barometer with that of a mercury barometer, it is important to note that the height of the liquid column in a barometer is determined by the atmospheric pressure pushing down on the liquid. Since both the wine and mercury barometers are subjected to the same atmospheric pressure, the height of the columns will be the same if the densities of the liquids are the same. However, since the density of wine is less than that of mercury, the height of the wine column will be greater than that of the mercury column. Therefore, No (B) is the correct answer.
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The amount of electrons flowing through the wire is called what?
amperes (amps)
current
voltage
ohms
Answer:
Current
Explanation:
Current can refer to the flow of electrons through a conductor of some kind as well as the number of electrons flowing through the conductor.
Final answer:
The amount of electrons flowing through the wire is called current, which is measured in amperes or amps. Current is directly proportional to voltage and inversely proportional to resistance, as stated in Ohm's Law.
Explanation:
The amount of electrons flowing through the wire is called current. Electric current is measured in the unit known as ampere (A), which is defined as the flow of one coulomb of charge through an area in one second. According to Ohm's Law, the current I in a circuit is directly proportional to the voltage V applied across the circuit and inversely proportional to the resistance R of the circuit, which can be expressed by the equation I = V/R. The SI unit of current is ampere, whereas ohm is the SI unit for electrical resistance, which represents how strongly a material opposes the flow of electric current.
While sitting in your car by the side of a country road, you see your friend, who happens to have an identical car with an identical horn, approaching you. You blow your horn, which has a frequency of 260 Hz; your friend begins to blow his horn as well, and you hear a beat frequency of 6.0Hz .
How fast is your friend approaching you?
Express your answer to two significant figures and include the appropriate units.
Answer:
[tex] v_s =7.74\ m/s[/tex]
Explanation:
given,
Speed of sound = 343 m/s
frequency of horn = 260 Hz
the friend is approaching, the frequency is increased by the Doppler Effect. The frequency is 266 Hz
using formula
[tex]f' = \dfrac{v}{v-v_s}f_0[/tex]
[tex]266= \dfrac{343}{343 - v_s}(260)[/tex]
[tex]1.023= \dfrac{343}{343 - v_s}[/tex]
[tex]343 - v_s = 335.26[/tex]
[tex] v_s =7.74\ m/s[/tex]
the speed of friends approaching is equal to [tex] v_s =7.74\ m/s[/tex]
The transfer of energy by electromagnetic waves is called
Radiation refers to the transfer of energy by electromagnetic waves, a process that can take place with no medium, such as the heat from the sun reaching Earth.
Explanation:The transfer of energy by electromagnetic waves is known as radiation. This process does not require a medium; the energy is carried by photons in the electromagnetic waves. Examples of this process include the heat produced by the sun, which reaches the Earth via the transfer of radiant energy, and microwaves heating food through radiation.
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A 45 kg boy runs at a rate of 2.5 m/s and jumps on top of a stationary skateboard that has a mass of 4 kg. After jumping onto the board, the boy and the board travel off together. Assuming that momentum is conserved, what is the final speed of the boy and the board?
Answer:
v = 2.29 m/s
Explanation:
As we know that the external force on the system of mass of boy + board is ZERO
So here we can use momentum conservation
now we have
[tex]m_1v_1 + m_2v_2 = (m_1 + m_2) v[/tex]
now we have
[tex]45 (2.5) + 4(0) = (45 + 4) v[/tex]
now we have
[tex]v = \frac{45}{49} (2.5)[/tex]
[tex]v = 2.29 m/s[/tex]
Answer:
V = 2.29 m/s
Explanation:
Given that,
Mass of the boy, [tex]m_1=45\ kg[/tex]
Mass of the skateboard, [tex]m_2=4\ kg[/tex]
Initial speed of the boy, v = 2.5 m/s
Let V is the final velocity of the boy and the board. The net momentum of the system remains constant. Using the conservation of linear momentum to find it as :
[tex]45\times 2.5=(45+4)V[/tex]
[tex]V=\dfrac{45\times 2.5}{(45+4)}[/tex]
V = 2.29 m/s
So, the velocity of the boat after Batman lands in it 2.29 m/s. Hence, this is the required solution.
hot-air balloon is rising vertically. The angle of elevation from a point on level ground 122 feet from the balloon to a point directly under the passenger compartment changes from 17.9 degrees to 29.5 degrees. How far, to the nearest tenth of a foot, does the balloon rise during this period?
29.62 feet far, to the nearest tenth of a foot, does the balloon rise during this period
Explanation:
Hot-air balloon is rising vertically, the angle of elevation from a point on level ground = 122 feet (from the balloon)
The passenger compartment changes from = 17.9 degrees to 29.5 degree
[tex]\tan \left(17.9^{\circ}\right)=\frac{a}{122 \mathrm{ft}}[/tex]
[tex]a=122 \times \tan 17.9^{\circ}=122 \times 0.32299=39.4[/tex]
Similarly,
[tex]\tan \left(29.5^{\circ}\right)=\frac{b}{122 f t}[/tex]
[tex]b=122 \times \tan \left(29.5^{\circ}\right)=122 \times 0.56577=69.02[/tex]
The nearest tenth of a foot, the balloon rise during the period, as below
69.02 – 39.4 = 29.62 ft.
A projectile is launched from the earth’s surface at initial speed v0 at angle θ0 with the horizontal. When the projectile is at its maximum height h, it has half the speed it had when it was at half its maximum height h 2 . At what angle was the projectile launched.
Answer:
θ₀ = 67.79°
Explanation:
Given info
we know that
Ymax = v₀y² / (2g)
v = v₀x (when Y = Ymax)
when the projectile was at half its maximum height (Y')
v' = 2v = 2*v₀x
we can use the equations
(v')²= v'x² + v'y² ⇒ (2*v₀x)² = (v₀x)² + v'y² ⇒ v'y² = 3*(v₀x)² (I)
if we know that
v'y² = v₀y² - 2*g*(y')
y' = Ymax /2 = (v₀y² / (2g)) / 2 = v₀y² / (4g)
then
v'y² = v₀y² - 2*g*(v₀y² / (4g)) = v₀y² - (v₀y² / 2) = v₀y² / 2
⇒ v'y² = v₀y² / 2 (II)
we can say that (I) = (II)
3*(v₀x)² = v₀y² / 2 ⇒ v₀y = √6*v₀x
Finally we apply
tan θ₀ = v₀y / v₀x
⇒ tan θ₀ = √6*v₀x / v₀x = √6
⇒ θ₀ = tan⁻¹ (√6) = 67.79°
An inflatable raft (unoccupied) floats down a river at an approximately constant speed of 4.8 m/s. A child on a bridge, 81 m above the river, sees the raft in the river below and attempts to drop a small stone onto the raft. The child releases the stone from rest. In order for the stone to hit the raft, what must be the horizontal distance between the raft and the bridge when the child releases the stone?
Answer:
19.5 m
Explanation:
t = Time taken
u = Initial velocity = 0 (Assumed thrown from rest)
s = Displacement = 81 m
g = Acceleration due to gravity = 9.81 m/s² = a
Equation of linear motion
[tex]s=ut+\frac{1}{2}at^2\\\Rightarrow 81=0t+\frac{1}{2}\times 9.81\times t^2\\\Rightarrow t=\sqrt{\frac{81\times 2}{9.81}}\\\Rightarrow t=4.06371\ s[/tex]
The time taken for the stone to reach the river is 4.06371 seconds
Distance = Speed×Time
[tex]Distance=4.8\times 4.06371=19.5\ m[/tex]
The horizontal distance between the raft and the bridge when the child releases the stone should be 19.5 m
Explain how it is possible for the voltage amplitude across the capacitor to be greater than the voltage amplitude across the source.
Yes, the voltage across a capacitor in an RLC series circuit with AC can be greater than the source voltage, especially at resonance where the capacitive and inductive reactances cancel each other out and energy oscillates between the capacitor and inductor.
Explanation:In an RLC series circuit with alternating current (AC), it is indeed possible for the voltage amplitude across the capacitor to be greater than the voltage amplitude across the source. This phenomenon occurs due to resonance in the circuit, where the capacitive and inductive reactances can cancel each other out at a certain frequency, known as the resonant frequency. When the circuit is at resonance, the voltages across the capacitor and inductor can be much greater than the source voltage because of the energy oscillating between the electric field of the capacitor and the magnetic field of the inductor.
According to the equation Vc = Q/C, where Q is the charge and C is the capacitance, we see that the voltage across the capacitor (Vc) is directly proportional to the amount of charge stored and inversely proportional to the capacitance. In an AC RLC circuit at resonance, the charge can oscillate at amplitudes resulting in voltages across the capacitor that exceed the source voltage.
The same can be true for the voltage across the inductor. If the circuit is driven at or near its resonant frequency, the inductive reactance and capacitive reactance can become equal in magnitude but opposite in phase, leading to a situation where the voltage across the inductor also exceeds the source voltage due to the energy stored in its magnetic field.
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A cylinder containing an ideal gas has a volume of 2.6 m3 and a pressure of 1.5 × 105 Pa at a temperature of 300 K. The cylinder is placed against a metal block that is maintained at 900 K and the gas expands as the pressure remains constant until the temperature of the gas reaches 900 K. The change in internal energy of the gas is +6.0 × 105 J. How much heat did the gas absorb?
Explanation:
From the first law of thermodynamics,
Δ[tex]Q[/tex]=Δ[tex]U[/tex]+[tex]W[/tex]
Where [tex]Q[/tex] is the heat given to the gas,
[tex]U[/tex] is the internal energy of the gas,
[tex]W[/tex] is the workdone by the gas.
When pressure is constant,
[tex]\frac{V_{1}}{T_{1}}=\frac{V_{2}}{T_{2}}[/tex]
[tex]V_{2}=\frac{2.6\times 900}{300}=7.8m^{3}[/tex]
When pressure is constant,[tex]W=P[/tex]Δ[tex]V[/tex]
Where [tex]P[/tex] is pressure and [tex]V[/tex] is the volume of the gas.
Given [tex]P=1.5\times 10^{5}Pa[/tex]
Δ[tex]V=[/tex][tex]7.8-2.6=5.2m^{3}[/tex]
So,[tex]W=1.5\times 10^{5}\times 5.2=7.8\times 10^{5}J[/tex]
Given that Δ[tex]U=6\times 10^{5}[/tex]
So,Δ[tex]Q=[/tex][tex]6\times 10^{5}+7.8\times 10^{5}=13.8\times 10^{5}J[/tex]
By using the first law of thermodynamics, the ideal gas law, the given parameters and an additional calculation for the work done by the gas, we can calculate the total heat absorbed by the gas.
Explanation:To calculate the heat absorbed by the gas, we use the first law of thermodynamics which states that the heat absorbed by a system is equal to the change in its internal energy plus the work done by the system on its surroundings, expressed as Q = ΔEint + W. The change in internal energy, ΔEint, is given as +6.0 × 10^5 J.
Since the pressure is constant, the work done by the gas, W, can be calculated using W = PΔV, where P is the pressure and ΔV is the change in volume. The change in volume can be determined using the ideal gas law before and after the change, PV = nRT, thus, ΔV = nR(ΔT)/P. Substituting the given pressure, temperature change from 300 K to 900 K, and ideal gas constant, we can find ΔV.
After plugging ΔV into the equation for work done, we then add this to the change in internal energy to find the heat absorbed.
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