You are inside a jet plane moving at a constant velocity. You toss a rock straight up in the air, and then you keep your hand at the point of release. The rock comes down in your hand. This example illustrates
A) that light is a wave.
B) the Michelson-Morley experiment.
C) the principle of relativity.
D) the principle of the constancy of lightspeed.
E) that moving clocks go slow.
C
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Of the main sequence stars, those of type ________ have the longest main-sequence life spans
A) K B) M C) O D) B E) G
If the speed of light were infinite but the postulates of special relativity still held, then
A. time dilation would be obvious at low speeds. B. length contraction would not occur. C. objects could have negative kinetic energy. D. any moving object would have infinite momentum.
The equation 1/2 N2 + 3/2 H2? NH3 is not appropriately written because
a. the number of atoms of each element on each side is not the same. b. fractional coefficients are not generally used. c. nitrogen is not diatomic. d. the product is N2H4, not NH3.
A track star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth?