As water is withdrawn from a well, the water table around the well
A) subsides.
B) drops, making a cone of depression around the well.
C) dries up.
D) rises.
Answer: B
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A) the solar plane B) the ecliptic plane C) Earth's axis D) the galactic plane E) an astronomical unit
The attraction of Earth on a skydiver pulls the diver downward. The reaction to this force is
A) air resistance the skydiver encounters while falling. B) Earth pulling upward on the skydiver. C) the attraction to the planets, stars, and every particle in the universe. D) all of the above E) none of the above
If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will
A) increase by a factor of 3. B) increase by a factor of 9. C) increase by a factor of 18. D) increase by a factor of 27. E) increase by a factor of 81.
Momentum: A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the magnitude of the change in the momentum of the ball during the rebound?
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