Sketch the schematic diagram of energy transfers for a heat engine
What will be an ideal response?
See Fig. 20-2 in the text.
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Under which of the following conditions would a car have a westward acceleration?
A) As a car travels eastward with its velocity is increasing. B) A a car travels eastward with its velocity is decreasing. C) As a car travels westward with its velocity is decreasing. D) As a car travels westward with its velocity is constant. E) As a car travels eastward with its velocity is constant.
Once a current has been established in a superconducting material, how much energy is needed to keep it going?
a. None. b. Energy must be continuously provided as the same rate that was used to establish the current in the first place. c. Energy must continue to be provided at a lower rate than initially. d. Superconductors remove energy from the environment to maintain the current. e. The power needed to maintain the current is half that to establish it initially.
What causes the seasons?
A. the motion of the equinoxes B. Earth's distance from the Sun varies throughout the year. C. The ecliptic is tilted with respect to the Celestial Equator. D. the tilt of the celestial sphere with respect to the equator E. None of these choices is correct.
The estimated age of the Milky Way Galaxy is about ________.
A. 4.6 billion years B. 13 billion years C. 100,000 years D. 20 billion years