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aev [14]
2 years ago
5

12*8A hollow steel ball weighing 4 pounds is suspended from a spring. This stretches the spring 13 feet. The ball is started in

motion from the equilibrium position with a downward velocity of 2 feet per second. The air resistance (in pounds) of the moving ball numerically equals 4 times its velocity (in feet per second) . Suppose that after t seconds the ball is y feet below its rest position. Find y in terms of t. (Note that the positive direction is down.) Take as the gravitational acceleration 32 feet per second per second

Physics
1 answer:
max2010maxim [7]2 years ago
6 0

Answer:

See attached pictures.

Explanation:

See attachments for explanation.

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Traffic officials indicate, it takes longer to ______ when you drive fast.
nignag [31]
The answer in the blank is that it is difficult to accelerate at decelerate the vehicle when it is on a fast speed because having a fast speed makes it difficult to adjust the meter as well as if you try to decelerate the vehicle, it could burn out the tires and engine as it is in the fast speed, in accelerating it, it could also be complicated because it would only make the car faster enough that you may no longer control of how to stop it.
7 0
2 years ago
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The magnetic field of an electromagnetic wave in a vacuum is Bz =(2.4μT)sin((1.05×107)x−ωt), where x is in m and t is in s. You
tatiyna

Answer:

Explanation:

Given

B_z=(2.4\mu T)\sin (1.05\times 10^7x-\omega t)

Em wave is in the form of

B=B_0\sin (kx-\omega t)

where \omega =frequency\ of\ oscillation

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B_0=Maximum\ value\ of\ Magnetic\ Field

Wave constant for EM wave k is

k=1.05\times 10^7 m^{-1}

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\lambda =\frac{2\pi }{1.05\times 10^7}

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7 0
2 years ago
5. How much does a suitcase weigh if it has a mass of 22.5 kg?
Aloiza [94]
27 pounds might be the answer cause 5.4 is 9 pound wick is an average size of an suite case
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2 years ago
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Carly places one end of a steel bar in a Bunsen flame and the other end in an ice cube.
slamgirl [31]

Answer:

answer a) 2

Explanation:

Assuming stationary state, following Fourier's law:

Q = A*k* dT/dL

where Q= heat flow , A= cross sectional area, dT/dL= temperature gradient along the bar

if the cross sectional area is doubled , then the gradient is the same ( since the heat sources do not change in temperature or position , and the length of the bar is the same). Since the gradient is same , the temperature is the same under stationary conditions , then we can assume k remains constant in the cross section.Therefore

Q₁= A₁*k* dT/dL

Q₂= A₂*k* dT/dL

dividing both equations

Q₂ / Q₁ = A₂/A₁ = 2

then the correct answer is a)

Note:

Since the cross sectional area is doubled, then heat loss to the surroundings will be

Q loss= h* A exposed * ΔT

then

Q loss₂ / Q loss ₁ = A exposed ₂/ A exposed  ₁

for a circular cross section or a squared cross section

A exposed ₂/ A exposed  ₁ = √2

then

Q loss₂ / Q loss ₁ = √2

therefore we did not take into account the increase in heat loss due to the increased in exposed area to the environment

5 0
2 years ago
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One way of thinking of energy is to say the energy is the ability of the body to do work. If you have a body that is moving that body has kinetic energy, as said above this energy can be used to do work. The amount of work done is equal to the amount of energy that body has.
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And that is exaclty how much work you would have to put in to stop the cylinder.

3 0
2 years ago
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