Acceleration is the time rate of change of what?
a. distance
b. speed
c. displacement
d. velocity
Ans: d. velocity
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Two coins, each with a Head and a Tail, are tossed randomly onto a table. The microstate is defined as the "number of Heads showing". The number of Heads can be, 0, 1, 2. What value for the "number of Heads showing" has the greatest number of microstates?
A. 0 B. 1 C. 2
What would happen if the fusion rate in the core increased but the core could not expand?
A) The Sun's core would heat and the rate of fusion would increase further. B) The Sun's core would reach a new equilibrium, but at a higher temperature. C) The Sun's core would reach a new equilibrium, but at a cooler temperature. D) The Sun's core would cool and the rate of fusion would decrease.
What do we mean by the event horizon of a black hole?
A) It is the point beyond which neither light nor anything else can escape. B) It is the center of the black hole. C) It is the distance from the black hole at which stable orbits are possible. D) It is the place where x-rays are emitted from black holes.
What do sunspots tell us about the Sun's rotation rate?
What will be an ideal response?