The apparent weight of a fish in an elevator is greatest when the elevator
a. moves downward at constant velocity.
b. moves upward at constant velocity.
c. accelerates downward.
d. accelerates upward.
e. is not moving.
d
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Why does the rotation of a protostar slow down over time?
A) Magnetic fields can transfer angular momentum to the protostellar disk and protostellar winds can carry angular momentum away. B) All rotating objects slow down over time. C) The onset of fusion causes the rotation rate to slow dramatically. D) Magnetic fields of other stars interact with the magnetic fields of the protostars, slowing its rotation.
In which of the following processes does the system's total mass change?
A) An automobile speeds up. B) A rubber ball is squeezed. C) The total mass changes in both of the above processes. D) The total mass changed in neither of the above processes.
When red, green, and blue lights shine on a golf ball, the shadows cast are
A) red, green, and blue. B) black. C) magenta, cyan, and yellow. D) none of the above
An iron stove, used for heating a room by radiation, is more efficient if:
A. its inner surface is highly polished B. its inner surface is covered with aluminum paint C. its outer surface is covered with aluminum paint D. its outer surface is rough and black E. its outer surface is highly polished