A person in a rocket ship traveling past the earth at a speed of 0.500c fires a laser gun in the forward direction. With what speed does an observer on Earth measure for the light pulse?
What will be an ideal response?
c = 3.00 × 108 m/s
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During the eighteenth and nineteenth centuries, attempts to precisely measure the astronomical unit relied largely on rare:
A) total solar eclipses. B) transits of the inferior planets across the Sun. C) passages of comets close to the Earth. D) maximum elongations of Venus. E) oppositions of Mars.
Two objects are dropped from a bridge, an interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation
A) decreases. B) increases at first, but then stays constant. C) increases. D) stays constant. E) decreases at first, but then stays constant.
Is space expanding within clusters of galaxies?
A) No, because the universe is not old enough yet for these objects to have begun their expansion. B) No, because expansion of the universe affects only empty space, not space in which matter is present. C) Yes, and that is why clusters tend to grow in size with time. D) No, because their gravity is strong enough to hold them together even while the universe as a whole expands.
Two water waves, call them X and Y, have the same amplitude but different wavelengths: X has a larger wavelength than Y. Regarding their frequencies and their energies,
A) Y has the larger frequency and carries the greater energy. B) Y has the larger frequency and X carries the greater energy. C) X has the larger frequency and Y carries the greater energy. D) X has the larger frequency and carries the greater energy. E) Y has the larger frequency and the two waves carry the same energy.