An Earth satellite in an elliptical orbit travels fastest when it is
A) nearest the Earth.
B) farthest from the Earth.
C) neither of these
Answer: A
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How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm?
a) same amount of work b) twice the work c) 4 times the work d) 8 times the work
The intrinsic brightness of a star is referred to as its
A) radiance B) luminosity C) surface temperature D) apparent brightness
While ionized hydrogen glows bright red, neutral hydrogen is transparent visibly and best studied with 21-cm radio waves
Indicate whether the statement is true or false
The reason that we can calculate the change in entropy of a system is that
a. entropy always decreases. b. entropy always increases. c. the entropy of the universe always remains constant. d. it depends only on the properties of the initial and final equilibrium states. e. systems always follow reversible paths.