Suppose you know the speed of a spacecraft in kilometers per second. How would you calculate its speed in kilometers per hour?
A) Multiply by 60 and then multiply by 60 again.
B) Divide by 60 and then divide by 60 again.
C) Multiply by 24.
D) Divide by 24.
B) Divide by 60 and then divide by 60 again.
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According to general relativity, why does Earth orbit the Sun?
A) Earth orbits the Sun because the mysterious force that we call gravity holds Earth in orbit. B) Earth is following the straightest path possible through spacetime, but this path happens to go around and around the Sun. C) Earth orbits the Sun because Earth and Sun are connected by a "rope-like" set of invisible, subatomic particles. D) Earth orbits the Sun because a spacetime diagram shows the Sun to be a bowl-shaped dip in a rubber sheet.
The orbit of the binary pulsar, PSR 1936+16, studied by Taylor and Hulse
a. is so small that the orbital period is smaller than the pulsar period. b. is growing smaller, presumably by emitting gravitational waves. c. provides evidence that it is being orbited by at least 6 planets the size of Jupiter. d. shows large changes each time an X-ray burst is emitted from the system. e. contains a white dwarf and a black hole.
Planets do not move in precise ellipses, as had been thought by Kepler, because of
A) dust grains and other material that disturbs the orbits. B) influences due to the other planets. C) Both of the above. D) Nonsense--the planets actually do move in precise ellipses.
The force that holds atoms together to form molecules is
1) electric, 2) magnetic, 3) gravitational, 4) nuclear, and the force that holds the protons in a nucleus together is 5) electric. 6) magnetic. 7) gravitational. 8) nuclear.