A dome-shaped house is more heat efficient than a rectangular house because a dome has

A) no corners to radiate.
B) less interior space.
C) less area compared to its volume.
D) all of the above
E) none of the above


Answer: C

Physics & Space Science

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A hoop (I = MR2) is rolling along the ground at 10 m/s. It comes to a hill and starts going up. Assuming no losses to friction, how far does it travel vertically up the hill before it stops?

a. 10 m b. 3.7 m c. 5.1 m d. 7.7 m

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When you interchange your emitter for one with a smaller work function, you measure

A. An increased current B. A decrease in the necessary stopping voltage C. An increase in the necessary stopping voltage D. No change in either current or stopping voltage E. Either a or c. You cannot determine which from the information given.

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If one of the pair of Magdeburg hemispheres were fastened to a strong tree, the force needed by a single party to pull them apart would be

A) half as much. B) the same. C) twice as much. D) none of the above

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Since 1 kilowatt equals 1000 watts, and 1 hour equals 3600 seconds, it follows that the kilowatt-hour is

A) an energy of 3.6 million joules. B) a power of 3.6 million watts. C) an energy of 3.6 million watts. D) a power of 3.6 million joules. E) None of the above.

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