Which of the following is a reason why low-mass stars cannot get very hot when they contract?
A) They are unable to convert gravitational energy into thermal energy.
B) They have limited gravitational energy.
C) They get very hot and hence can ignite several nuclear fuels.
D) They can sustain hydrogen fusion only if their masses are less than 0.08 solar mass.
B
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Consider two blocks, one made of wood and the other of lead. They have the same dimensions but the lead is much more massive. If they are dropped and fall long enough to reach terminal velocity, which block experiences a larger force from air resistance?
A. The lead block B. The force on each is equal C. The wood block D. It isn't important because air resistance can be ignored
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