A 0.10-kg ball is dropped from a height of 10 m and rebounds to a height of 8.0 m
a. Is energy conserved in the ball?
b. If not, how much energy was lost, and what happened to it?
a. No
b. 2.0 J, lost primarily to frictional heat
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The bluer the light, the ____ each photon contains
a. more energy b. less energy c. less speed d. more speed e. none of the above
Compared to the Sun, white dwarfs have higher ________ and lower ________.
A. volumes; surface temperatures B. luminosities; surface temperatures C. masses; surface temperatures D. surface temperatures; luminosities
There are positive and negative magnetic charges, analogous to positive and negative electric charges
Indicate whether the statement is true or false
A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg • m2. If the arms are pulled in so the moment of inertia decreases to 1.80 kg • m2, what is the final angular speed?
A) 2.25 rad/s B) 4.60 rad/s C) 6.25 rad/s D) 1.76 rad/s E) 0.810 rad/s