Answer:
1. A). Scalar
2.C) remains de same
Explanation:
HELP ASAP PLEASE!!
Something that is beneath the surface of the water is:
A. lower
B. submerged
C. sunken
D. less
Answer:
B. Submerged
Explanation:
A woman wears bifocal glasses with the lenses 2.0 cm in front of her eyes. The upper half of each lens has power-0.500 diopter and corrects her far vision so that she can focus clearly on distant when looking through that half. The lower half of each lens has power +2.00 diopters and corrects her near vision when she looks through that half What are the far point and near point of her eyes?
The far point of a woman's eyes is -2 meters and the near point is 50 cm.
The far point and near point of a woman's eyes can be determined using the power of her bifocal glasses. The power of a corrective lens is the reciprocal of the focal length in meters (P = 1/f). The upper half of the bifocal glasses has a power of -0.500 diopters, which corrects for far vision, and the lower half has a power of +2.00 diopters, which corrects for near vision.
To find the far point, we use the power for far vision. Since her far correction is -0.500 diopters, this means that her far point is:
Far Point (FP) = 1/P = 1/(-0.500 D) = -2 meters
The negative sign indicates that the woman is myopic (nearsighted), and can clearly see objects up to a distance of 2 meters.
To find the near point, we consider the power for near vision. The near correction is +2.00 diopters, which means that her near point is:
Near Point (NP) = 1/P = 1/(+2.00 D) = 0.50 meters or 50 cm
Thus, the woman's near point is 50 cm, which is the closest distance at which she can see objects clearly without the need for further accommodation.
The far point of the woman's eyes is at infinity, and the near point is 50.0 cm in front of her eyes.
To understand why, let's consider the purpose of bifocal glasses. The upper half of the lens with a power of -0.500 diopters is used to correct the woman's far vision. Since the power of the lens is negative, it is designed to diverge light slightly so that the woman can focus on distant objects (at infinity) when looking through the upper half of the lens. This implies that her far point, without the glasses, would be slightly beyond infinity, but with the glasses, it is effectively at infinity.
The lower half of the lens has a power of +2.00 diopters, which is used to correct her near vision. This positive power converges light, allowing the woman to focus on close objects. The power in diopters (P) is the reciprocal of the focal length (f) in meters. Therefore, we can calculate the focal length of the near vision correction as follows:
[tex]\[ P = \frac{1}{f} \] \[ f = \frac{1}{P} \] \[ f = \frac{1}{2.00 \text{ diopters}} \] \[ f = 0.500 \text{ meters} \] \[ f = 50.0 \text{ cm} \][/tex]
This focal length represents the near point of her eyes when she is wearing the glasses. It means that with the glasses on, she can focus clearly on objects that are 50.0 cm away from her eyes when looking through the lower half of the lens.
In summary, the far point of her eyes with the glasses is at infinity, and the near point is 50.0 cm away. This is consistent with the typical use of bifocal glasses, which is to enable clear vision at both distant and near objects.
A rogue band of colonists on the moon declares war and prepares to use a catapult to launch large boulders at the earth. Assume that the boulders are launched from the point on the moon nearest the earth. For this problem you can ignore the rotation of the two bodies and the orbiting of the moon.1) What is the minimum speed with which a boulder must be launched to reach the earth? Hint: The minimum speed is not the escape speed. You need to analyze a three-body system.2) Ignoring air resistance, what is the impact speed on earth of a boulder launched at this minimum speed?
Answer:
2.3 km/s11 km/sExplanation:
The system is made up of three body system which are the boulder, earth and the moon also the sum of potential ad kinetic energies are assumed to be the same also note that the boulder was launched from the moon at an initial velocity
A ) Minimum speed of the boulder for it to reach the earth = 2.3 km/s
B) ignoring air resistance the impact speed on earth of a boulder launched at this minimum speed = 11 km/s
find attached the solution in details
A disk of mass 2M and radius R is freely spinning in space at a constant speed ω when a second disk of mass M and radius R with no angular speed is carefully dropped on top such that the centers of the disks align. Friction causes the two items to move together as one. What is the new angular speed of the pair?
Answer:
The new angular speed is 2/3omega
Explanation:
See attached handwritten document for more details
Answer:
2ω/3
Explanation:
The moments of inertia of the 1st disk is:
[tex]I_1 = (2MR^2)/2 = MR^2[/tex]
The moments of inertia of the 2nd disk is:
[tex]I_2 = MR^2/2[/tex]
So the total moments of inertia of the system of 2 disks after the drop is:
[tex]I = I_1 + I_2 = MR^2 + MR^2/2 = 1.5MR^2[/tex]
Using law of angular momentum conservation we have the following equation for before and after the drop
[tex]I_1\omega = I\omega_2[/tex]
[tex]\omega_2 = \omega\frac{I_1}{I} = \omega\frac{MR^2}{1.5MR^2} = 2\omega/3[/tex]
What happens to a path of a light ray parallel to the principal axis, after it passes through a converging
lens?
Answer: The ray that passes through the focal point on the way to the lens will refract and travel parallel to the principal axis. ... All three rays should intersect at exactly the same point.
Explanation: Once these incident rays strike the lens, refract them according to the three rules of refraction for converging lenses.
When a light ray parallel to the principal axis passes through a converging lens, it is bent towards the principal axis and converges to a point called the focal point.
Explanation:When a light ray parallel to the principal axis passes through a converging lens, it is bent towards the principal axis and converges to a point. This point is known as the focal point of the lens. The path of the light ray after passing through the lens depends on the distance of the object from the lens and the focal length of the lens.
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A block of mass m attached to the end of a spring of spring constant k undergoes simple harmonic motion with amplitude A and angular frequency ω. The position of the block is described by a cosine function with an initial phase angle ϕ = 0. Which of the variables m, k, A, or ϕ should you increase if you want to increase the frequency of oscillation?
Answer:
To increase the frequency the spring constant k should be increased.
Explanation:
In simple harmonic motion, the frequency is expressed as;
f = (1/2π)√(k/m)
where;
k is spring constant
m is mass of the object
From the frequency formula i wrote, It’s obvious that frequency depends on only the spring constant and mass while Amplitude(A) and phase angle(ϕ) are not related and would have no effect on the frequency. Thus, by inspection, an increase in spring constant increases frequency while an increase in mass decreases frequency
On the planet Arrakis, a male ornithoid sings at a frequency of 1180 Hz. When flying toward her mate at a speed of 30 m/s, a female ornithoid hears the sound at a frequency of 1250 Hz. What is the speed of sound in the atmosphere of Arrakis?
Answer:
775m/s
Explanation:
See attached file
Answer:
The speed of sound in the atmosphere of Arrakis is 505.7 m/s.
Explanation:
given information:
male frequency, [tex]f_{m}[/tex] = 1180 Hz
female speed, [tex]v_{f}[/tex] = 30 m/s
female frequency, [tex]f_{f}[/tex] = 1250
to calculate the speed of sound in the atmosphere of Arrakis, we can use Doppler effect
[tex]f_{l} = \frac{v + v_{l} }{v+v_{s} } f_{s}[/tex]
where
[tex]f_{l}[/tex] = the frequency of listener
[tex]f_{s}[/tex] = the frequency of source
[tex]v[/tex] = speed of sound wave
[tex]v_{l}[/tex] = speed of listener
[tex]v_{s}[/tex] = speed of source
in this case, the male ornithoid is the source while the female is the listener.
[tex]v_{l}[/tex] or speed of listener is positive since the listener move toward the source, so
[tex]f_{l} = \frac{v + v_{l} }{v+v_{s} } f_{s}[/tex]
[tex]1250 = \frac{v +30}{v+0} 1180[/tex]
[tex]\frac{1250}{1180} = \frac{v+30}{v}[/tex]
[tex]\frac{125}{118} = \frac{v+30}{v}[/tex]
[tex]125v = 118v+3540[/tex]
[tex](125-118) v = 3540[/tex]
[tex]v = \frac{3540}{7}[/tex]
= 505.7 m/s
Formulate and write a computer program to determine the effects of pressure ratio, minimum/maximum temperature ratio, compressor efficiency, and turbine efficiency on overall cycle efficiency, net-work output per unit mass, and back-work ratio of an actual gas turbine (Brayton cycle).
Answer:
A gas turbine, also called a combustion turbine, is a type of continuous and internal combustion engine. The main elements common to all gas turbine engines are:
an upstream rotating gas compressor
a combustor
a downstream turbine on the same shaft as the compressor.
A fourth component is often used to increase efficiency (on turboprops and turbofans), to convert power into mechanical or electric form (on turboshafts and electric generators), or to achieve greater thrust-to-weight ratio (on afterburning engines).
The basic operation of the gas turbine is a Brayton cycle with air as the working fluid. Atmospheric air flows through the compressor that brings it to higher pressure. Energy is then added by spraying fuel into the air and igniting it so the combustion generates a high-temperature flow. This high-temperature high-pressure gas enters a turbine, where it expands down to the exhaust pressure, producing a shaft work output in the process. The turbine shaft work is used to drive the compressor; the energy that is not used for compressing the working fluid comes out in the exhaust gases that can be used to do external work, such as directly producing thrust in a turbojet engine, or rotating a second, independent turbine (known as a power turbine) which can be connected to a fan, propeller, or electrical generator. The purpose of the gas turbine determines the design so that the most desirable split of energy between the thrust and the shaft work is achieved. The fourth step of the Brayton cycle (cooling of the working fluid) is omitted, as gas turbines are open systems that do not use the same air again.
Gas turbines are used to power aircraft, trains, ships, electrical generators, pumps, gas compressors, and tanks.[1]
Explanation: As applied above.
The two containers of water below are completely insulated so that no heat can be transferred in or out. The water in both containers started at room temperature (20 0C), and heat was transferred to both using heating coils until they reached the indicated final temperatures.
Which container had more heat transferred on it.?
Complete Question
The complete question is shown on the first uploaded image s
Answer:
The container that had more heat transfer is container B
Explanation:
From the question we are told that
The initial temperature of water i both container is [tex]\theta_i = 20^oC[/tex]
generally the rate of heat transfer is mathematically represented as
[tex]Q = mc\Delta T[/tex]
in the question we can see that the temperature is same for the both water in the container but their masses are the same and from the equation we can see that each parameter varies directly with the rate of heat transfer so it then mean that the water in container B would have more heat transfer because its mass is greater.
The container with more water had more heat transferred to it, as the heat required to change the temperature of a substance is proportional to its mass and specific heat capacity.
Explanation:The question addresses a scenario involving two water containers with different volumes heated to certain temperatures and asks which container had more heat transferred to it. This is a classic example in the study of calorimetry, where heat transfer results in temperature changes. To determine which container received more heat, the concept of heat capacity and the formula Q = mcΔT (where Q is heat energy, m is mass, c is specific heat capacity, and ΔT is the change in temperature) can be applied.
In this case, since both containers started at room temperature and reached their respective final temperatures, the amount of heat absorbed or lost is directly proportional to the mass (volume of water) and their specific heat capacity. Given that water's specific heat capacity is constant, the container with the larger volume of water would require a larger amount of heat to reach its final temperature.
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A simple pendulum consists of a point mass suspended by a weightless, rigid wire in a uniform gravitation field. Which of the following statements are true when the system undergoes small oscillations? Check all that apply. Check all that apply. The period is inversely proportional to the suspended mass. The period is proportional to the square root of the length of the wire. The period is proportional to the suspended mass. The period is inversely proportional to the length of the wire. The period is independent of the length of the wire. The period is independent of the suspended mass.
Explanation:
The time period of the simple pendulum that consists of a point mass suspended by a weightless, rigid wire in a uniform gravitation field is given by :
[tex]T=2\pi \sqrt{\dfrac{l}{g}}[/tex]
l is length of simple pendulum
g is acceleration due to gravity.
It is clear that, the time period is independent of the mass. Also, the period is proportional to the square root of the length of the wire.
Hence, the correct options are (B) and (F).
One cubic foot of water can store 312 Btu of thermal energy. On a cold winter day a well-constructed home may require 100,000 Btu of nighttime space heating. What is the volume of water required to store this energy?
Answer:
Explanation:
Heat capacity = mass x specific heat
heat capacity ∝ mass
∝ volume
heat capacity ∝ volume
H₁ / H₂ = V₁ / V₂
H₁ and H₂ are heat capacity corresponding to volume V₁ and V₂.
312 / 100000 = 1 / V₂
V₂ = 100000 / 312
= 320.51 cubic foot.
An Arrow (0.5 kg) travels with velocity 60 m/s to the right when it pierces an apple (1 kg) which is initially at rest. After the collision, the arrow and the apple are stuck together. Assume that no external forces are present and therefore the momentum for the system is conserved. What is the final velocity (in m/s) of apple and arrow after the collision
Answer:
Velocity after collision will be 20 m/sec
Explanation:
We have given mass of arrow [tex]m_1=0.5kg[/tex]
Mass of arrow [tex]v_1=60m/sec[/tex]
Mass of apple [tex]m_2=1kg[/tex]
Apple is at rest so velocity of apple [tex]v_2=0m/sec[/tex]
According to conservation of momentum
Momentum before collision is equal to momentum after collision
[tex]m_1v_1+m_2v_2=(m_1+m_2)v[/tex]
[tex]0.5\times 60+1\times 0=(0.5+1)v[/tex]
[tex]1.5v=30[/tex]
v = 20 m/sec
Two speakers are placed 500 meters away from each other. A person stands right in the middle of the two speakers. One of the speakers sends a sound wave traveling at 343m/s towards the person standing in the middle and the other speaker sends a sound wave traveling at 342m/s. How long after the person in the middle hears the first sound wave will he hear the second wave ( ) (please answer the question with unit of seconds)
Answer:
the second wave will be heard at [tex]2*10^{-3} \ sec[/tex] after the first sound wave.
Explanation:
Given that:
two speakers are placed 500 meters away from each other and a person is standing in the middle;
that implies that the distance of the speed of the wave travelling is divided into two equal which is 250 m
Now; from the first speaker, time to reach sound wave is;
[tex]t_1 = \frac{250}{v_1}[/tex]
[tex]t_1 = \frac{250}{343}[/tex]
[tex]t_1 = 0.728 \ sec[/tex]
Also from the second speaker; time to reach sound wave is;
[tex]t_2 = \frac{250}{v_2}[/tex]
[tex]t_2 = \frac{250}{342}[/tex]
[tex]t_2 =0.730 \ sec[/tex]
[tex]t_2 - t_1 = (0.730 - 0.728 )\ sec[/tex]
[tex]= 0 .002 \ sec\\\\= 2*10^{-3} \ sec[/tex]
Thus, the second wave will be heard at [tex]2*10^{-3} \ sec[/tex] after the first sound wave.
Benzene gas (C6H6) enters a well-insulated reactor operating at steady state at 77oF, 1 atm, and burns completely with dry air entering as a separated stream at 300oF, 1 atm. The combustion products exit the reactor at 1600oF. Kinetic and potential energy effects are negligible. Determine the percent of theoretical dry air provided.
Answer:
The the percent of theoretical dry air provided is 35.71%
Explanation:
Refer to attached handwritten document for calculation
When light of wavelength 236 nm shines on a metal surface the maximum kinetic energy of the photoelectrons is 1.99 eV. What is the maximum wavelength (in nm) of light that will produce photoelectrons from this surface?
(Use 1 eV = 1.602 ✕ 10−19 J, e = 1.602 ✕ 10−19 C, c = 2.998 ✕ 108 m/s, and h = 6.626 ✕ 10−34 J · s = 4.136 ✕ 10−15 eV · s as necessary.)
Answer:
Explanation:
Energy of photon = h c / λ , h is planks constant , c is velocity of light and λ is wave length
= 6.626 x 10⁻³⁴ x 2.998 x 10⁸ / 236 x 10⁻⁹
= .08417 x 10⁻¹⁷ J
Kinetic energy of photoelectron = 1.99 e V
= 1.99 x 1.602 x 10⁻¹⁹ J
= 3.18798 x 10⁻¹⁹
= .03188 x 10⁻¹⁷ J
Diff of energy = .08417 - .03188 x 10⁻¹⁷
= .05229 x 10⁻¹⁷ J
This will be the work function of the metal
If λ be the maximum wave-length required
h c / λ = .05229 x 10⁻¹⁷
6.626 x 10⁻³⁴ x 2.998 x 10⁸ / λ = .05229 x 10⁻¹⁷
λ = 6.626 x 10⁻³⁴ x 2.998 x 10⁸ / .05229 x 10⁻¹⁷
= 379.89 x 10⁻⁹ m
= 379.89 nm .
(1 point) Suppose a spring with spring constant 1 N/m is horizontal and has one end attached to a wall and the other end attached to a mass. You want to use the spring to weigh items. You put the spring into motion and find the frequency to be 1.4 Hz (cycles per second). What is the mass? Assume there is no friction.
Answer:
Explanation:
Given that,
The spring constant
K = 1N/m
Frequency of motion
f = 14Hz
We want calculate the mass m?
The frequency of spring system is related to the mass by
From w = √k/m
Where w = 2πf
f = 1/2π √k/m
Where,
w is angular frequency in rad/s
m is mass of object attached in kg
k is the spring constant in N/m
f Is the frequency in Hz
Then, make m subject of formula
Multiply both sides by 2π
2πf = √k/m
Square both sides
4π²f² = k/m
Then, k= 4π²f² × m
m = k / 4π²f²
m = 1 / (4π² × 1.4)
m = 1 / 55.27
m = 0.0181 kg
m= 18.1 g
The mass of the object attached in 18.1 g or 0.0181 kg
Final answer:
To find the mass attached to a spring with a known frequency of 1.4 Hz and a spring constant of 1 N/m, we use the formula for the frequency of a spring-mass system, resulting in a mass of approximately 0.081 kg.
Explanation:
The question asks about finding the mass attached to a spring when the frequency of motion is known, assuming no friction. The formula to determine the frequency of a spring-mass system is given by f = (1/2π)∙(k/m)^½, where f is the frequency in hertz, k is the spring constant in Newtons per meter, and m is the mass in kilograms. Given the frequency of 1.4 Hz and a spring constant of 1 N/m, we rearrange the formula to solve for m: m = k / (2πf)^². Substituting the given values, we calculate the mass as follows: m = 1 / (2π(1.4))^² ≈ 0.081 kg. Therefore, the mass attached to the spring is approximately 0.081 kilograms.
Sound travels through water at a speed of 1500 m/s. If the frequency of a sound is 1000 Hz, what is the wavelength?
Answer:
1.5m
Explanation:
Velocity=1500m/s
Frequency=1000hz
Wavelength =velocity ➗ frequency
wavelength =1500 ➗ 1000
Wavelength=1.5m
The wavelength of a sound, given a frequency of 1000 Hz and a speed of 1500 m/s, is 1.5 meters as determined by using the formula Wavelength = Speed / Frequency.
Explanation:In the field of Physics, the wavelength of a sound is calculated using the speed of sound and its frequency. The speed at which sound travels is given as 1500 m/s, and the frequency of sound as 1000 Hz. The formula used to calculate wavelength is Speed = Frequency x Wavelength. In this case, rearranging to find wavelength gives us, Wavelength = Speed Frequency. Therefore, the wavelength of the sound is 1500m/s / 1000Hz, which equals 1.5 meters.
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A chemist must dilute 58.00ml of 13.5 aqueous silver(II) oxide solution until the concentration falls to 5.00M. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in milliliters. Round your answer to 3 significant digits.
Answer:
Explanation:
The given solution of silver oxide = 58 ml of 13.5 M of silver oxide
When we increase its volume , its molar concentration becomes less . To calculate the concentration of diluted solution , we can apply the following relation .
S₁ V₁ = S₂ V₂ .
S₁ is molar strength when volume is V₁ . S₂ is molar strength when volume is V₂
Puting the given values in the formula above ,
58 x 13.5 M = V₂ x 5
V₂ = 58 x 13.5 / 5
= 156.6 ml .
= 157 ml after rounding off.
A flat coil of wire consisting of 15 turns, each with an area of 40 cm 2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 1.5 T to 5.1 T in 2.0 s. If the coil has a total resistance of 0.20 Ω, what is the magnitude of the induced current?
Answer:
0.54 A
Explanation:
Parameters given:
Number of turns, N = 15
Area of coil, A = 40 cm² = 0.004 m²
Change in magnetic field, ΔB = 5.1 - 1.5 = 3.6 T
Time interval, Δt = 2 secs
Resistance of the coil, R = 0.2 ohms
To get the magnitude of the current, we have to first find the magnitude of the EMF induced in the coil:
|V| = |(-N * ΔB * A) /Δt)
|V| = | (-15 * 3.6 * 0.004) / 2 |
|V| = 0.108 V
According to Ohm's law:
|V| = |I| * R
|I| = |V| / R
|I| = 0.108 / 0.2
|I| = 0.54 A
The magnitude of the current in the coil of wire is 0.54 A
Two plane mirrors are facing each other. They are parallel, 6 cm apart, and 24 cm in length, as the drawing indicates. A laser beam is directed at the top mirror from the left edge of the bottom mirror. What is the smallest angle of incidence with respect to the top mirror, such that the laser beam hits the mirrors in each way
Answer: 33.69 degrees
Explanation:
Given
Distance between the two mirrors, = 6 cm
Length of the two mirrors, = 24 cm
Assuming the laser is shone from just clear of the left edge of the bottom mirror,
a)
Tan L = (O/A)
Tan L = (6 / 12)
Tan L = 0.5
L = Tan^-1 (0.5)
L = 26.57 degrees
(90 - 26.57) = 63.43 deg. to the normal.
Tan L = (6 / [24/6])
Tan L = (6 / 4)
Tan L = 1.5
L = Tan^-1 (1.5)
L = 56.31 degrees
(90 - 56.31) = 33.69 deg. to the normal.
Thus, the angle at which, with respect to the mirror, the laser beam hits the mirrors in each way is 33.69 degrees
Answer:
86degrrss
Explanation:
tan L =BC/AB
= 3/12 = 1/4
L= tan^-1 0.25
=4.0 degrees
= 90-4= 86degrees
A proton is located at the origin and an electron is located at (1.0, 1.0) mm:
(a) Determine the electric dipole moment of these two particles in unit vector notation.
(b) If we put this electric dipole moment in an external electric field vector(E) = 300vector(i) (N/C), calculate the work done by the electric field to rotate the dipole so that it becomes in the same direction as the field.
Answer:
(a). [tex]{\vec{p} =(1.6*10^{-22}\bold{i}+1.6*10^{-22}\bold{j})m \cdot C.}[/tex]
(b). [tex]U = 4.8*10^{-20}J.[/tex]
Explanation:
(a).
The electric dipole moment of the charges is
[tex]\vec{p} = q \vec{r}[/tex]
In our case
[tex]\vec{r} = (1.0*10^{-3}\bold{i}+1.0*10^{-3}\bold{j})m[/tex]
and
[tex]q =1.6*10^{-19}C[/tex];
therefore, the dipole moment is
[tex]\vec{p} =1.6*10^{-19}C *(1.0*10^{-3}\bold{i}+1.0*10^{-3}\bold{j})m[/tex]
[tex]\boxed{\vec{p} =(1.6*10^{-22}\bold{i}+1.6*10^{-22}\bold{j})m \cdot C.}[/tex]
(b).
The work done [tex]U[/tex] by an external electric field [tex]\vec{E}[/tex] is
[tex]U = -\vec{p}\cdot \vec{E}[/tex]
[tex]U = [1.6*10^{-22}\bold{i}+1.6*10^{-22}\bold{j}] \cdot[300\bold{i}][/tex]
[tex]\boxed{U = 4.8*10^{-20}J.}[/tex]
A cat walks along a plank with mass M= 6.00 kg. The plank is supported by two sawhorses. The center of mass of the plank is a distance d1= 0.850 m to the left of sawhorse B. When the cat is a distance d2= 1.11 m to the right of sawhorse B, the plank just begins to tip.
If the cat has a mass of 2.9 kg, how far to the right of sawhorse B can it walk before the plank begins to tip?
Answer:
d₂ = 1.466 m
Explanation:
In this case we must use the rotational equilibrium equations
Στ = 0
τ = F r
we must set a reference system, we use with origin at the easel B and an axis parallel to the plank , we will use that the counterclockwise ratio is positive
+ W d₁ - w_cat d₂ = 0
d₂ = W / w d₁
d₂ = M /m d₁
d₂ = 5.00 /2.9 0.850
d₂ = 1.466 m
A motor transmits a torque of to the centerof gear A. Determine the angular velocity of each of thethree (equal) smaller gears in 2 s starting from rest. Thesmaller gears (B) are pinned at their centers, and the massesand centroidal radii of gyration of the gears are given in thefigure
Please ignore that i attempted this question
With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (Be careful-the focal length of a lens underwater is not the same as in air! Assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. Assume that the eyeglasses are 1.79 cm in front of the eye
Answer:
Please see the attached picture for the complete answer.
Explanation:
You want to manufacture a guitar such that the instrument will be in tune when each of the strings are tightened to the same tension. The middle (D) string on the guitar should have fundamental frequency 146.83 Hz. The highest (E) string should have fundamental frequency 329.63 Hz. If the D string has linear mass density 0.00256kg/m, what should be the mass density of the E string
Answer:
0.000507 kg/m
Explanation:
L = Length of string
T = Tension
[tex]\mu[/tex] = Mass density of string
E denotes the E string
D denotes the D String
Frequency is given by
[tex]f=\dfrac{1}{2L}\sqrt{\dfrac{T}{\mu}}[/tex]
So
[tex]f\propto \sqrt{\dfrac{1}{\mu}}[/tex]
[tex]\dfrac{f_D}{f_E}=\sqrt{\dfrac{\mu_E}{\mu_D}}\\\Rightarrow \mu_E=\dfrac{f_D^2}{f_E^2}\mu_D\\\Rightarrow \mu_E=\dfrac{146.83^2}{329.63^2}\times 0.00256\\\Rightarrow \mu_E=0.000507\ kg/m[/tex]
The mass density of the E string is 0.000507 kg/m
An airplane is ying in the direction 25 west of north at 800 km/h. (a) (4 points) Find the component form of the velocity of the airplane, assuming that the positive x-axis represents due east and the positive y-axis represents the north. (b) (8 points) What speed and direction should the wind be in order for the airplane to now y 500 km/h due east
Answer:
Explanation:
FIND THE SOLUTION BELOW
Answer:
a) v = (-338.1î + 725ĵ) km/h
b) Velocity of the wind = (-838.1î + 725ĵ) km/h
Magnitude of the wind = 1108.17 km/h
Direction = -40.9°; that is, 40.9° in the clockwise direction from the positive x-axis.
Explanation:
a) Airplane is flying 800 km/h in a direction 25° west of North.
Velocity of the plane = (vₓ, vᵧ)
vₓ = v cos θ
vᵧ = v sin θ
v = magnitude of the velocity = 800 km/h
θ = angle the velocity makes with the positive x-axis = 90° + 25° = 115°
vₓ = v cos θ
vₓ = 800 cos 115° = - 338.1 km/h
vᵧ = v sin θ
vᵧ = 800 sin 115° = 725 km/h
v = (-338.1î + 725ĵ) km/h
b) What speed and direction should the wind be in order for the airplane to now fly 500 km/h due east
Relative velocity of airplane with respect to the wind
= (velocity of the airplane) - (velocity of the wind)
Note that the velocities on the right hand side are with respect to earth's frame of reference.
Relative velocity of airplane with respect to the wind = 500 km/h east = (500î) km/h
velocity of the airplane = (-338.1î + 725ĵ) km/h
velocity of the wind = ?
500î = (-338.1î + 725ĵ) - (velocity of the wind)
(velocity of the wind) = (-338.1î + 725ĵ) - 500î
= (-838.1î + 725ĵ) km/h
Velocity of the wind = (-838.1î + 725ĵ) km/h
Magnitude = √[(-838.1)² + (725²)] = 1108.17 km/h
Direction = tan⁻¹ (725 ÷ -838.1) = -40.9°
Hope this Helps!!!
Stunt car A and stunt car B are identical cars with the same mass of 43.3 kg. They are both traveling at 70.7 m/s. Stunt car A crashes into a hard wood wall, whereas stunt car B crashes into a large pile of soft sand. They both come to a complete stop after the impact.
Stunt Car A experiences a _____________________ over a _____________ of time. Stunt Car B experiences a _____________________ over a _____________ of time. Because of the force experienced by Stunt Car A, it will sustain ____________ damage than Stunt Car B.
Answer:
1) Stunt car A experiences a large stopping force over a short period of time.
2 stunt car B experiences a small stopping force over a longer period of time
3) stunt car A will sustain more damage than stunt car B
Explanation:
the mass and speed of both stunt cars are equal.
Mass = 43.3kg
Speed = 70.7 m/s
Their initial momentum = mv = 43.3 x 70.7 = 3061.31 kg-m/s
Their final momentum will be equal to zero since they come to a complete stop.
The rate of change of momentum = 3061.31 - 0 = 3061.31 kg-m/s
Rate of change of momentum = impulse
Impulse = force times time duration of impact
I = f x t
From this equation, the answers it can be seen that a shorter time duration of impact will produce a large force and vice versa.
(10 points) Consider a single crystal of some hypothetical metal that has the FCC crystal structure, and its critical resolved shear stress is 3.42 MPa. The crystal is oriented such that a tensile stress is applied at an angle of 39.2 degrees to the slip plane. Slip can occur in two directions( 18.4 and 74.2 degrees to the tensile force). (a) (5 points) Which direction, is slip favored
Complete Question
(10 points) Consider a single crystal of some hypothetical metal that has the FCC crystal structure, and its critical resolved shear stress is 3.42 MPa. The crystal is oriented such that a tensile stress is applied at an angle of 39.2 degrees to the slip plane. Slip can occur in two directions( 18.4 and 74.2 degrees to the tensile force).
(a) (5 points) Which direction, is slip favored?
b) (5 points) What is the yield strength of this crystal during this tensile test ?
Answer:
a
the slip would occur 18.4° to the tensile force
b
The yield strength is [tex]\sigma_y = 4.65\ MPa[/tex]
Explanation:
From the question we are told that
The Resolved shear force is [tex]\sigma = 3.2MPa[/tex]
The angle in which the tensile stress is applied is [tex]\O = 39.2^o[/tex]
The first direction of slip is [tex]\theta _ 1 =18.4^o[/tex]
The second direction of the slip is [tex]\theta_2 = 74.2^o[/tex]
Generally the condition for direction in which slip is likely to occur(
direction in which slip is favored ) is that [tex](cos( \O) cos (\theta) )[/tex]
Must be Maximum for that direction
Since [tex]Cos (\O)[/tex] is constant for both direction we would look at the the cos of the the angle for both direction
[tex]Cos (\theta_ 1) = Cos(18.4^o) =0.9488[/tex]
[tex]Cos (\theta_ 2) = Cos(74.2^o) =0.2722[/tex]
From this calculation we can see that the slip would occur 18.4° to the tensile force
Generally critical resolved shear stress is mathematically represented as
[tex]\sigma = \sigma_y * (cos(\O) cos(\theta_1))[/tex]
Where [tex]\sigma_y[/tex] is the yield strength
Making [tex]\sigma_y[/tex] the subject
[tex]\sigma_y = \frac{\sigma }{[cos (\O) cos(\theta_1)]}[/tex]
Substituting value
[tex]\sigma_y = \frac{3.4*10^{6}}{cos (39.2) (cos 18.4)}[/tex]
[tex]\sigma_y = 4.65\ MPa[/tex]
A box with a total surface area of 1.47 m2 and a wall thickness of 3.91 cm is made of an insulating material. A 15.9 W electric heater inside the box maintains the inside temperature at 8.4 ◦C above the outside temperature. Find the thermal conductivity of the insulating material. Answer in units of W/m · ◦ C.
Answer:
0.05 W/m°C
Explanation:
Surface area of box, A = 1.47 m²
thickness of wall, d = 3.91 cm = 0.0391 m
Power of heater, P = 15.9 W
difference in temperature, ΔT = 8.4 °C
Let K is the thermal conductivity.
Heat flows per unit time is given by
[tex]H=\frac{KA\Delta T}{d}[/tex]
[tex]15.9=\frac{K\times 1.47\times 8.4}{0.0391}[/tex]
K = 0.05 W/m°C
Thus, the thermal conductivity of the box is 0.05 W/m°C.
Two rather unequal cars are competing in a drag race. For simplicity, let's assume that the accelerations of the cars are constant. Car 1 has an acceleration of 3.3 m/s2, while Car 2 has an acceleration of 5.9 m/s2. Car 2 gets off to a late start, 0.5 seconds after Car 1.
1. At what time after Car 1 took off will it be overtaken by Car 2?
2. How far down the track will this happen?
3. How much faster will Car 2 be than Car 1 by that time?
Answer:
car1: a=3.1m/s^2 , car2: a=6.1m/s^2
(a) 1/2*3.1*t^2= 1/2*6.1*(t-0.9)^2
1.55t^2= 3.05(t^2-1.8t+0.81)= 3.05t^2-5.49t+2.4705
1.5t^2-5.49t+2.4705= 0
t= 3.13457 = 3.14[s] after.
(b) d= 1/2*3.1*3.13457^2= 15.23[m] approx.
(c) car1: v=at = 3.1*3.13457= 9.717m/s
car2: v=at = 6.1*(3.13457-0.9)= 13.631m/s
13.631-9.717= 3.914 = 3.91[m/s] faster than car1.
At the time after 3.14 seconds, car1 is overtaken by car2, this will happen after 15.23 meters and car2 is 3.914 m/s faster than car1.
What is Acceleration?In mechanics, acceleration is the measure of how quickly an object's velocity changes in relation to time. The quantity is a vector. An object's acceleration is determined by the direction of the net force exerted on it.
Acceleration is a vector quantity since it has a magnitude and a direction. A vector quantity is also velocity. Acceleration is defined as the change in velocity vector over a time interval divided by the time interval.
There are several types of acceleration :
Uniform AccelerationNon-Uniform AccelerationAverage Acceleration(a)
1/2 × 3.1× t²
⇒ 1/2 × 6.1 × (t-0.9)²
⇒1.55t²= 3.05 (t² - 1.8t + 0.81)
⇒ 3.05t² -5.49t + 2.4705
=1.5t² -5.49t +2.4705= 0
t= 3.14 seconds.
(b)
d= 1/2 × 3.1 × 3.14²
= 15.23 meters
(c)
car1: v=at
⇒3.1 × 3.14
= 9.717 m/s
car2:
v=at
⇒ 6.1 × (3.14 - 0.9)
= 13.631 m/s
13.631-9.717= 3.914 m/s
Hence, car2 is 3.914 m/s faster than car1.
To get more information about Acceleration :
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