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Question
An 800-N woman stands at rest on two bathroom scales so that one scale shows a reading of 500 N. The reading on the other scale isA) 200 N.
B) 300 N.
C) 400 N.
D) 800 N.
E) none of the above
Answer
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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
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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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Q:
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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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
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When water boils, energy added to the water is counteracted by
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Q:
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Long ago a runaway greenhouse effect greatly transformed the planet
A) Mercury.
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A) conduction.
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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) warms.
B) cools.
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A) still warm.
B) cool.
C) neither of these
Q:
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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.
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A) an igloo.
B) a tent.
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Q:
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B) wood
C) snow
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A) stops heat flow.
B) slows heat flow.
C) speeds negative heat flow.
D) all of the above
Q:
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A) calories.
B) Calories.
C) joules.
D) any or all of the above for special cases
Q:
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.