The process in which thermal energy flows by the mass movement of molecules from one place to another is known as
A) conduction.
B) convection.
C) radiation.
B
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Satellites that lack craters are generally old, inactive bodies
Indicate whether the statement is true or false
The work?
done by the force exerted by the spring on a mass attached to the end of the spring when the mass has displacement 
is
A. ?negative half the time, positive the other half of the time. B. ?always negative. C. ?always positive. D. ?negative more than it is positive.
You are driving your car and set your sunglasses on the dashboard. When you make a left turn, the sunglasses go sliding off to the right. Explain
What will be an ideal response?
Astronauts in orbit around Earth feel weightless because
A) they are moving with constant velocity. B) no forces at all are acting on them. C) they must lose weight for the space program. D) there is no gravity out there. E) they are in "free fall" around Earth.