The inner boundary of the Sun's habitable zone currently lies
A) between the orbits of the Earth and Venus
B) between the orbits of Venus and Mercury
C) exactly at the distance of the Earth's orbit
D) exactly at the distance of Venus
A
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A ball bearing rolls along a smooth horizontal tabletop, and crashes head-on into a second ball bearing of half its mass. If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision, what was the velocity of the first ball bearing after the collision?
A. -2.4 m/s B. +2.4 m/s C. -1.2 m/s D. +1.2 m/s E. -0.6 m/s F. +0.6 m/s
Relative to a stationary observer, a moving clock
A) always runs slower than normal. B) always runs faster than normal. C) keeps its normal time. D) can do any of the above. It depends on the relative velocity between the observer and the clock. E) can do any of the above. It depends on the relative energy between the observer and the clock.
The planet HAT-P-32b has more than twice the radius of Jupiter, yet is only the same mass. It orbits its star more than a factor of ten closer than Mercury's orbit around the Sun. Which is the most plausible explanation for its large size?
A) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. B) Planets that are close to a star are hotter, causing them to puff up. C) It is made of elements other than hydrogen and helium which do not compress under their own gravity. D) The hydrogen and helium gas compressed under their own gravity.
A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water. What happens to the surface level of the pond?
a. It stays the same. b. It goes up. c. It goes down. d. More information is needed to reach a conclusion.