The relativistic effect of time dilation has been verified by which of the following?
a. twin experiments
c. muon experiments
b. red shift in distant galaxies
d. the discovery of black holes
C
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In a contest, two tractors pull two identical blocks of stone the same distance over identical surfaces. However, block A is moving twice as fast as block B when it crosses the finish line. Which statement is correct?
a. Block A has twice as much kinetic energy as block B. b. Block B has lost twice as much kinetic energy to friction as block A. c. Block B has lost twice as much kinetic energy as block A. d. Both blocks have had equal losses of energy to friction. e. No energy is lost to friction because the ground has no displacement.
None of the pulsars emit pulses of visible light because
a. pulsars are to hot to emit visible light. b. pulsars contain black holes that won't let visible light escape. c. the gravitational field of a pulsar is so great that the visible light emitted is red shifted. d. pulsars are too far away for the visible light to be bright enough to be detected at Earth. e. A few pulsars do emit visible light pulses.
Which planet could an astronaut visit without the need for a spacesuit (and survive)?
A) the Moon B) Mars C) Mercury D) Venus E) None; an astronaut would need a spacesuit to survive a visit to any other planet in the solar system.
Electric potential is the ratio of electric energy to the amount of electric
A) current. B) resistance. C) charge. D) voltage. E) none of the above