Which of the following characteristics are held in common by both gravitational and electrostatic forces when dealing with either point masses or charges?
a. inverse square distance law applies
b. forces are conservative
c. potential energy is a function of distance of separation
d. all of the above choices are valid
d
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Name the four forces of the universe from weakest to strongest
What will be an ideal response?
Which of the following phenomena are not thought to be results of collisions or other interactions between galaxies?
A) the fact that spiral galaxies have both disk and halo components B) the fact that elliptical galaxies are more common in clusters of galaxies than outside clusters C) starbursts D) the presence of very large, central dominant galaxies in clusters of galaxies
The faintest star visible to the naked eye has an apparent magnitude of about
A) 6. B) -1. C) 1. D) 0. E) 10.
What, if any, evidence did Galileo have for the law of inertia?
A) A smooth ball slows down when rolling uphill, and speeds up when rolling downhill, so it should maintain an unchanging speed on a level surface. B) Using a telescope, he observed meteors and comets moving at unchanging velocity through outer space. C) Noting that the length of the year does not change, he concluded that Earth must maintain an unchanging speed when moving around the sun. D) All of the above. E) He didn't have direct evidence, but proposed the law of inertia only because of the known failures of Aristotelian physics.