Physics Q&A

Question

You are standing in a moving bus, facing forward, with closed-toe shoes on, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forward?
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Answer

There is no force leading to your fall.

Question

A horizontal force accelerates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?
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Answer

It increases to more than double its original value.

Question

What is the mass of a person who weighs 110 lb?
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Answer

50 kg

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Question

A person rides in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates downward with an acceleration of 4.90 m/s^2, what is the reading on the scale?
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Answer

883 N

Question

What is the conversion factor between km/hr^2 and m/s^2?
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Answer

7.72 x 10^-6 m/s^2

Question

A hot air balloon rises to an altitude of 600 fathoms. What is this height in feet? (1 fathom = 6 feet)
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Answer

3600 ft

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Question

Concrete is sold by the cubic yard. 5.00 cubic yards of concrete would equal how many cubic meters? (1m = 1.094 yds)
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Answer

3.82 m^3

Question

An average human heart has a heart rate of 70 beats per minute. Using that average how many times has a teenager's heart beaten over 17 years?
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Answer

6.3 x 10^8

Question

The radius of the earth is 3963 mi. (1mi = 1609m) If you jogged at a 10 min/mi pace, how many days would it take to jog around the world?
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Answer

173 days

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