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devlian [24]
3 years ago
8

While standing in a low tunnel, you raise your arms and push against the ceiling with a force of 100 n. your mass is 70 kg. what

force does the ceiling exert on you?
Physics
1 answer:
alekssr [168]3 years ago
3 0
This is a manifestation of Newton's third law of motion called the Law of Action-Interaction. It states that when a body is at rest or not moving, for every force exerted on the object, an equal,opposite force is exerted also towards you. Thus, the ceiling also exerts an equal force of 100 Newtons.
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The height of the Washington Monument is measured to be 170 m on a day when its temperature is 35.0°C. What will the change in i
Alecsey [184]

Answer:

The deformation is 0.088289 m

The final height of the monument is 170-0.088289 = 169.911702 m

Explanation:

Thermal coefficient of marble varies between (5.5 - 14.1) ×10⁻⁶/K = α

So, let us take the average value

(5.5+14.1)/2 = 9.8×10⁻⁶ /K

Change in temperature = 35-(-18) = 53 K = ΔT

Original length = 170 m = L

Linear thermal expansion

\frac{\Delta L}{L} = \alpha\Delta T\\\Rightarrow \Delta L=\frac{\alpha\Delta T}{L}\\\Rightarrow \Delta L=9.8\times 10^{-6}\times 53\times 170

The deformation is 0.088289 m

The final height of the monument is 170-0.088289 = 169.911702 m (subtraction because of cooling)

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A 5kg object is moving at a height of 2 m. The potential energy of the object is closest to ___ j
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Answer:

In this case, a body of mass 5 kg kept at a height of 10 m. So the potential energy is given as 5 * 10 *10 = 500 J.

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he graph shows the distance (x) traveled by an aircraft traveling at constant velocity in corresponding time intervals (t). What
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Explanation:

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Answer:

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Explanation:

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