A ball drops some distance and loses 30 J of gravitational potential energy. Do NOT ignore air resistance. How much kinetic energy did the ball gain?
A) more than 30 J
B) exactly 30 J
C) less than 30 J
C
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General Questions: In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.
A. True B. False C. It depends on whether the collision is a head-on collision or a rear-end collision.
Why is Venus's surface hotter than Mercury's?
A. Clouds in Mercury's atmosphere reflect sunlight back into space and keep its surface cool. B. Venus rotates more slowly, so it "bakes" more in the Sun's heat. C. Venus is closer to the Sun. D. Carbon dioxide in Venus's atmosphere traps heat radiating from its surface, thereby making it warmer.
On a very cold day, a child puts his tongue against a fence post. It is much more likely that his tongue will stick to a steel post than to a wooden post. This is because:
A. steel has a higher specific heat B. steel is a better radiator of heat C. steel has a higher specific gravity D. steel is a better heat conductor E. steel is a highly magnetic material
If 2.0 kg of water at 0°C is to be vaporized, how much heat must be added?
A) 1080 cal B) 1080 kcal C) 1140 cal D) 1280 cal E) 1280 kcal