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Question
Why does plutonium not occur in appreciable amounts in natural ore deposits?A) Most naturally occurring plutonium deposits have already been depleted in the creation of nuclear weapons.
B) Plutonium is strictly a human-made element.
C) Any plutonium initially in the earth's crust has long since decayed.
D) Plutonium loses electrons to form positively charged particles that have long since washed into the oceans.
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.
C) increases by 1/273.
D) increases by 100/273.
Q:
Which of these is the smallest?
A) 1 Celsius degree
B) 1 kelvin
C) 1 Fahrenheit degree
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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.
B) layer of water slightly below the surface.
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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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The operation of a bimetallic strip relies on differences in
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Q:
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.
B) becomes less ordered.
C) reaches equilibrium.
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Q:
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
Q:
Which law of thermodynamics states that no system can reach absolute zero?
A) First law
B) Second 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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Q:
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A) one-quarter.
B) half as much.
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If Earth's mass somehow decreased with no change in its radius, your weight would
A) decrease also.
B) increase.
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Q:
Newton discovered
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B) that gravity is universal.
C) neither of these
Q:
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A) go into circular orbit about Earth.
B) rise and fall back to Earth's surface.
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B) farthest from the Earth.
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An Earth satellite in an elliptical orbit travels fastest when it is
A) nearest the Earth.
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C) neither of these
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From Earth, one satellite appears to overtake another. The faster satellite that is seen to overtake the other is
A) higher.
B) lower.
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The fastest moving planet in a solar system is the
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D) planet farthest from the Sun.
E) none of the above