An inventor suggests that a house might be heated by using a refrigerator to draw energy as heat from the ground and reject energy as heat into the house. He claims that the energy supplied to the house as heat can exceed the work required to run the refrigerator. This:
A. is impossible by first law
B. is impossible by second law
C. would only work if the ground and the house were at the same temperature
D. is impossible since heat energy flows from the (hot) house to the (cold) ground
E. is possible
Ans: E. is possible
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On a clear night when an observer in Los Angeles sees a first quarter Moon an observer in London would see
a. a full moon. b. a first quarter moon. c. a new moon. d. a third quarter moon. e. any of the above, depends on the time
A(n) ____ is a commonly accepted set of scientific ideas and assumptions
a. theory b. paradigm c. hypothesis d. natural law e. model
A car travels at 50.0 km/hr for 2.00 hours. It then travels an additional distance of 40.0 km in 1.00 hour. The average speed of the car for the entire trip is
A. 61.0 km/hr. B. 57.1 km/hr. C. 53.3 km/hr. D. 46.7 km/hr. E. 30.0 km/hr.
A muon formed high in the Earth's atmosphere travels at a speed 0.870c for a distance of 4.00 km before it decays. What is the muon's lifetime as measured in its reference frame?
a. 3.1E–5 s b. 7.6E–6 s c. 1.5E–5 s d. 5.1E–5 s e. 4.3E–5 s