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Question
What is the primary difference between a fuel cell and a battery?A) Fuel cells do not run down because they can be refueled; batteries run down and need to be recharged.
B) Batteries can be recharged, fuel cells cannot.
C) Batteries supply electricity; fuel cells supply heat.
D) Fuel cells oxidize to supply electricity, batteries reduce to supply electricity.
E) Fuel cells do not use metals as oxidants and reductants, batteries have a static reservoir of oxidant and reductant.
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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E) none of the above
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A) kinetic energy.
B) potential energy.
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If water had a lower specific heat capacity, would ponds and lakes be more or less likely to freeze in winter?
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.
C) bottom 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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B) expands.
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If water at 20C slightly increases in temperature, the water
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Q:
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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The moderate temperatures of islands throughout the world has mainly to do with water's
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Q:
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A) iron
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Q:
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A) becomes more ordered.
B) becomes less ordered.
C) reaches equilibrium.
D) moves toward destruction.
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
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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:
According to Newton, the greater the distance between gravitationally interacting objects, the
A) less the gravitational force between them.
B) more the gravitational force between them.
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Q:
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 is
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
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B) increase.
C) remain the same.
Q:
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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B) farthest from the Earth.
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A) nearest the Earth.
B) farthest from the Earth.
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
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B) lower.
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The fastest moving planet in a solar system is the
A) smallest planet.
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C) planet nearest the Sun.
D) planet farthest from the Sun.
E) none of the above