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Question
A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. The acceleration of the block isA) 1 m/s2.
B) 2 m/s2.
C) 5 m/s2.
D) 10 m/s2.
E) none of the above
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
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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.
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B) released.
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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
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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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B) the same as that of simmering water.
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Q:
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C) both of these
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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.
C) off.
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Q:
A good reflector of radiation is a
A) good absorber of radiation.
B) good emitter of radiation.
C) poor absorber of radiation.
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Q:
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A) thermal energy decreases.
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B) the outcome of radioactivity in Earth's interior.
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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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Q:
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B) a tent.
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Q:
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A) stops heat flow.
B) slows heat flow.
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D) all of the above
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A) calories.
B) Calories.
C) joules.
D) any or all of the above for special cases
Q:
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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.