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Question
Consider two planets in space that gravitationally attract each other. If the masses of both planets are doubled, and the distance between them doesn't change, then the force between them isA) one-quarter.
B) half as much.
C) twice as much.
D) four times as much.
E) none of the above
Answer
This answer is hidden. It contains 1 characters.
Related questions
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Heat energy is measured in units of
A) degrees.
B) joules.
C) calories.
D) both joules and calories.
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When the temperature of a fixed volume of air initially at 0 C is lowered by 1 degree, its pressure
A) decreases by 1/273.
B) decreases by 100/273.
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Which of these is the smallest?
A) 1 Celsius degree
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Distinguish between the concepts of thermal energy, temperature, and heat.
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Water at 4C will expand when it is slightly
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C) both of these
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If water at 0C slightly increases in temperature, the water
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If water at 20C slightly increases in temperature, the water
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A kg of 40C water and a kg of 20C water, after being mixed, have a temperature of 30C. However, the final temperature of a 1-kg iron block at 40C placed into 1 kg of water at 20C is
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A) becomes more ordered.
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C) reaches equilibrium.
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When work is done by a system and heat is subtracted, the temperature of the system
A) increases.
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C) remains unchanged.
Q:
Which law of thermodynamics addresses the direction of heat flow?
A) First law
B) Second law
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Q:
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Q:
At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same when this point is
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B) increase.
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Newton discovered
A) gravity.
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C) neither of these
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B) rise and fall back to Earth's surface.
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A) nearest the Earth.
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An Earth satellite in an elliptical orbit travels fastest when it is
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