At what speed would an astronaut need to travel so that he would age 4.20 years while traveling a distance of 4.20 ly as measured by a stationary observer?
A. 1.00 c
B. This cannot be done.
C. 1.00 c/2
D. .707 c
E. .750 c
D. .707 c
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When we look into the band of light in our sky that we call the Milky Way, can we see distant galaxies? Why or why not? (Assume we are looking with visible light telescopes.)
A) Yes, distant galaxies appear as small, fuzzy patches of light within the Milky Way band. B) yes, but only when we look in the direction of the constellation Sagittarius C) no, because the stars, gas, and dust of the Milky Way block our view of more distant objects D) no, because galaxies exist only above and below the plane of the Milky Way E) no, because distant galaxies are too dim to be seen even with powerful telescopes
As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that
A) its length will increase and its clock will run more slowly. B) its length will decrease and its clock will run faster. C) its length will decrease and its clock will run more slowly. D) its length will increase and its clock will run faster. E) None of these will happen.
When the distance between the two charges is doubled, the force between them is
A) doubled. B) quadrupled. C) reduced by a factor of 3. D) reduced by a factor of . E) reduced by a factor of 4.
Quasars are far more luminous than Type I supernovae; why not use them to calibrate Ho and the age of the universe?
What will be an ideal response?