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Question
Shoot a cannonball horizontally from a cannon at a mountain top and it gains speed as it falls and hits the ground below. But fire the cannonball fast enough for circular orbit and no change in speed occurs. Why?Answer
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Related questions
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Which requires more energy?
A) melting a gram of 0C ice
B) increasing the temperature of 1 gram of water from 0C to 100C
C) changing 1 gram of 100C water to 100C steam
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In walking barefoot on red-hot coals, providing that bits of coal do not stick to your feet, it would be safer if your feet are
A) wet.
B) dry.
C) either of these
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As a block of ice at 0C melts, the block absorbs energy
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B) and increases in temperature.
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Foreign ions introduced to water
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When bringing water to a boil in the mountains, the time needed to reach the boiling point is
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A good cook knows that the temperature of violently boiling water is
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B) the same as that of simmering water.
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Long ago a runaway greenhouse effect greatly transformed the planet
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When you leave your warm house for an hour or so on a cold day, to save energy you should turn the thermostat
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Q:
A good reflector of radiation is a
A) good absorber of radiation.
B) good emitter of radiation.
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D) both joules and calories.