Which type of generating plant would you expect to be more energy efficient, steam-electric or hydroelectric?
A) Hydroelectric, because the lake and river water provides natural cooling for the exhaust.
B) Steam-electric, because there is so much more energy per ton in fossil fuels than in water behind a dam.
C) Hydroelectric, because it is not a heat engine and so is not restricted by the second law of thermodynamics.
D) Hydroelectric, because there is so much energy in a large lake raised up behind a dam.
E) Steam-electric, because it can have a very high operating temperature due to having a large and thick boiler.
C
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A pool ball moving at 3 m/s collides head-on with an identical pool ball that's initially at rest. Just after the collision, the second ball moves away at 2 m/s while the first ball
A) moves at 3 m/s in a direction opposite to the second ball. B) continues moving at 3 m/s in the same direction. C) is at rest. D) moves at 1 m/s in the same direction as the second ball. E) moves at 1 m/s in a direction opposite to the second ball.
The average distance from Earth to the Sun is 1 AU
a. True b. False Indicate whether the statement is true or false
Imagine you throw a tennis ball vertically into the air. At the exact top of its trajectory it is at rest. What is the magnitude of its acceleration at this point?
A. 9.8 m/s2
B. –9.8 m/s2
C. 0 < 
< 9.8 m/s2
D. 0
E. Other (specify)
The pressure of sunlight was one of the forces that cleared the solar nebula
Indicate whether the statement is true or false