A motor converts
a. electricity into magnetism.
b. electrical energy into mechanical energy.
c. mechanical energy into electrical energy.
d. force into power.
b
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According to the principle of equivalence, gravity is equivalent to
A) acceleration. B) the state of free-fall. C) net force. D) energy. E) velocity.
How many times bigger is the Local Group of Galaxies in which the Milky Way resides than the Milky Way Galaxy itself?
a) it isn't bigger than the Milky Way b) about 10 times bigger c) about 1040 times bigger d) about 1010 times bigger e) about 1 million times bigger
Why are main-sequence lifetimes shorter for more massive stars?
A) They aren't; higher mass stars have longer lifetimes. B) Strong stellar winds cause higher mass stars to lose mass quickly. C) Higher core temperatures allow fusion to proceed much more rapidly. D) More massive stars are made of heavier elements that don't fuse as easily.
For which of the graphs was the result most curved, and closest to the one we are familiar with for the planet orbits about the Sun?
A.) 0%. B.) 25%. C.) 50%. D.) 75%. E.) 100%.