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