When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contact about 10 times that of a stiff-legged landing. In this way the average force your body experiences is
A) less than 1/10 as great.
B) more than 1/10 as great.
C) about 1/10 as great.
D) about 10 times as great.
Answer: C
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Consider the loop of flexible wire shown below. If we pass a current through the loop, will it tend to expand (becoming more circular), scrunch up even more tightly, or do nothing?
A. Expand
B. Scrunch up
C. Do nothing
D. The answer depends on the current’s direction.
Much of Mercury's cratered surface closely resembles the lunar ________
Fill in the blank(s) with correct word
Sue is traveling toward you at 90 km/hr. She throws a baseball that, according to her, is going at 90 km/hr in the opposite direction. What do you see the ball doing?
A) You see the ball traveling away from you at 90 km/hr. B) You see the ball remaining stationary. C) You see the ball traveling away from you at 180 km/hr. D) You see the ball traveling toward you at 90 km/hr. E) You see the ball traveling toward you at 180 km/hr.
Most experts believe that, for safe disposal, high-level nuclear wastes should be buried for
A) 100,000 to 1 million years. B) a few million years. C) 100 to 500 years. D) 1000 to 10,000 years. E) as long as humans remain on Earth.