A figure skater with arms initially extended starts spinning on the ice at 3 rad/s. She then pulls her arms in close to her body. Which of the following results?
a. a smaller rotational rate b. a greater rotational rate
c. a greater angular momentum d. a smaller angular momentum
b
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A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
A. on all three. B. only on the book. C. only on the chair. D. upwards on the chair and downwards on the book. E. only on the objects that you have defined to be part of the system.
A speeding car traveling at a constant velocity of 24 m/s passes a police care initially at rest beside the roadway. If the police car with constant acceleration of 3.0 m/s2 immediately pursues the speeding car, how far down the road does it draw even with the speeding car?
a. 190 m b. 290 m c. 380 m d. 770 m
Which reason best explains why both Venus's and Mars's atmospheres are primarily carbon dioxide, but Earth's is much less than 1% carbon dioxide?
A. Each planet has a significantly different surface temperature. B. Venus and Mars, being smaller than Earth, can't retain the same mixture of gases as Earth. C. Earth's rocks had much less carbon and oxygen in them. D. Plant life has existed on Earth for an extended amount of time.
The Sun is a G2V type star.
Answer the following statement true (T) or false (F)