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Question
A common car engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 MJ/L, how many kilometers per liter does the car achieve?A) 14 km/L
B) 12 km/L
C) 10 km/L
D) 8 km/L
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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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:
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B) and increases in temperature.
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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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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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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.
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Q:
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A) good absorber of radiation.
B) good emitter of radiation.
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Q:
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A) warms.
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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:
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A) the inside of the paper is wet.
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B) slows heat flow.
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B) Calories.
C) joules.
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C) both of these
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Q:
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A) degrees.
B) joules.
C) calories.
D) both joules and calories.