If you push five times as hard against a non-moving wall, the amount of work you do A) remains constant but non-zero.
B) doubles.
C) quadruples.
D) is cut in half.
E) zero.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for 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.

In science and physics what is the standard unit of measure for speed?