Which man exerts greater pressure against the floor?
1) a 150-kg man lying on the floor
2) a 150-kg man standing on the floor
3) Both men exert the same pressure.
The reason is that
4) both men have the same weight.
5) the upright man's weight is distributed over a smaller area.
6) the man lying down has his weight equally distributed.
Answer: 2, 5
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What will be an ideal response?
A crate is being pushed with a constant horizontal force, F. Four forces can be identified: 1) F, 2) the gravitational force, 3) the normal force, and 4) the frictional force. Which forces do NO work on the crate?
A. 1 & 4 B. 2 & 3 C. 2 & 3 & 4 D. 1 & 2 & 3
Irregular galaxies, although small, have large H II regions and much on-going star formation for their size
Indicate whether the statement is true or false
Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of the
A) energy emitted by distant quasars, which is far larger than can be explained by the visible matter in the quasars. B) gravitational bending of light from distant galaxies as it passes other galaxies on its way to Earth. C) redshift in the light from the earliest galaxies in the universe. D) force of gravity acting on laboratory objects. E) redshift in the light from the explosions of distant supernovas.