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Question
How is it possible that today's diverse universe was able to arise from that which was very homogeneous at its first moments?A) Inflation magnified ultrasmall quantum variations in position and momenta.
B) There is evidence of a second, slightly smaller Big Bang that took place very shortly after the initial Big Bang, which would account for the variation in structure.
C) The rapidly cooling universe created massive quantities of hydrogen, and then helium, which interacted with each other to create regions of relative structure.
D) Entropy immediately came into effect, slowing down some areas of expansion, while increasing others.
Answer
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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.
C) increases by 1/273.
D) increases by 100/273.
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Which of these is the smallest?
A) 1 Celsius degree
B) 1 kelvin
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C) Kelvin
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B) potential energy.
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Q:
Distinguish between the concepts of thermal energy, temperature, and heat.
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A) surface of bodies of water.
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Water at 4C will expand when it is slightly
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B) warmed.
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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Q:
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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.
B) decreases.
C) remains unchanged.
Q:
Which law of thermodynamics addresses the direction of heat flow?
A) First law
B) Second law
C) Third law
D) all of the above
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A) First law
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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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Q:
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A) less the gravitational force between them.
B) more the gravitational force between them.
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B) half as much.
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A) decrease also.
B) increase.
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Q:
Newton discovered
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C) neither of these
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B) lower.
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D) planet farthest from the Sun.
E) none of the above