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Question
The power expended for a barbell raised 2.0 m in 2 s isA) 1 W.
B) 4 W.
C) 8 W.
D) not enough information
Answer
This answer is hidden. It contains 1 characters.
Related questions
Q:
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
D) all the same
Q:
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
D) none of the above
Q:
As a block of ice at 0C melts, the block absorbs energy
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B) and increases in temperature.
C) without a temperature change.
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When snow falls, the surrounding air is normally
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B) warmed.
C) both of these
D) none of the above
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When a gas changes phase to become a solid, energy is
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Foreign ions introduced to water
A) lower the freezing point of water.
B) raise the freezing point of water.
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When bringing water to a boil in the mountains, the time needed to reach the boiling point is
A) less than at sea level.
B) more than at sea level.
C) the same as at sea level.
Q:
A good cook knows that the temperature of violently boiling water is
A) higher than that of simmering water.
B) the same as that of simmering water.
C) actually lower than 100C.
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When water boils, energy added to the water is counteracted by
A) decreased pressure in the water.
B) static equilibrium.
C) energy carried away by steam.
D) energy of the whole system.
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Q:
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A) speed.
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C) both of these
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The molecules in a room-temperature glass of water jostle around at
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Q:
Long ago a runaway greenhouse effect greatly transformed the planet
A) Mercury.
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A) conduction.
B) convection.
C) radiation.
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Q:
When you leave your warm house for an hour or so on a cold day, to save energy you should turn the thermostat
A) down.
B) up.
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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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Q:
A piece of pizza is normally a net radiator of energy when its temperature is
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A) thermal energy decreases.
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Radiant energy emitted by our planet is
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Q:
If a volume of air is warmed, it expands. If a volume of air expands, it
A) warms.
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A) still warm.
B) cool.
C) neither of these
Q:
Coastal winds that shift from night to day illustrate
A) conduction.
B) convection.
C) radiation.
D) all about equally
Q:
A water-filled paper cup held in a flame will not catch fire because
A) the inside of the paper is wet.
B) water is an excellent conductor of heat.
C) paper is a good conductor of heat.
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B) good insulation.
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C) snow
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In practice, a good insulator
A) stops heat flow.
B) slows heat flow.
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A) calories.
B) Calories.
C) joules.
D) any or all of the above for special cases
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Heat is thermal energy that matter
A) contains.
B) transfers.
C) both of these
D) none of the above
Q:
Heat energy is measured in units of
A) degrees.
B) joules.
C) calories.
D) both joules and calories.