Why can't an object return to a point in spacetime that it previously occupied?
A) It would require going back in time.
B) It would require going faster than the speed of light.
C) It would require deviating from the straightest possible path.
D) It could be possible, but only if the universe has a spherical geometry.
A) It would require going back in time.
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Time Dilation: An astronaut on a spaceship moving at 0.927c says that the trip between two stationary stars took 4.26 y. How long does this journey appear to take to someone in the rest frame of the two stars?
A. 11.4 y B. 1.60 y C. 2.30 y D. 12.6 y
Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
A) measuring the orbital velocities of galaxies in the cluster B) measuring the temperature of x-ray gas in the intracluster medium C) measuring the amount of distortion caused by gravitational lensing
Some quasars show absorption spectra with a smaller redshift than their emission spectra. This indicates that
A) they are much closer than previously thought. B) there is cooler gas between us and the quasar. C) we still don't understand redshifts. D) their black holes are still contracting. E) their black holes are still expanding.
A package is oscillating on a spring scale with a period of 4.60 s. At time t = 0.00 s the package has zero speed and is at x = 8.30 cm. At what time after t = 0.00 s will the package first be at x = 4.15 cm?
A) 0.575 s B) 0.767 s C) 1.15 s D) 1.30 s E) 1.53 s