Einstein’s basic postulate of general relativity, the principle of equivalence, states:
A. Any new theory has to explain the ‘old’ phenomenon as well as the old theory did.
B. It is impossible to distinguish an acceleration of a frame of reference from the effects of gravity.
C. The laws of physics are the same in any inertial frame of reference.
B. It is impossible to distinguish an acceleration of a frame of reference from the effects of gravity.
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The Crab Nebula is an example of a(n) ________
Fill in the blank(s) with correct word
You have a set of 14 metal weights strung together by nylon fishing line at equal intervals. Each has a weight of 0.20 N. You suspend this array from the ceiling and then observe waves travel up and down by shaking it.
The wave seems to move more rapidly at the top, near weights 1-3. This is because
A. gravity is cancelled by tension, so net force is zero. B. there is more tension in the fishing line near weights 1-3 than down by weight 14. C. weight 14 is balanced by no other weight, but weight 1 is balance by 13 others below it. D. the amount of mass per centimeter is higher toward the top, near weights 1-3.
Which of these statements is true about the rotation of Earth?
a. Earth does not precess. b. Precession only applies in conditions of gravity, so Earth cannot precess. c. Earth is a slightly irregular sphere and precesses very slowly. d. Earth is a very irregular imitation of a sphere, and precesses very fast. e. Earth's North Pole has always pointed toward the star Polaris.
Much of Europa's surface appears chaotic and clogged with huge iceberg-like blocks. This is consistent with
A) a thin icy crust that has been broken into pieces by tidal forces below which is a subsurface ocean of water B) the surface thawing due to heat emitted by Jupiter C) the breaking up of the surface due to plate tectonics D) a giant impact that has recently shattered the crust into pieces