A painter of mass 80 kg climbs 3.0 m up a ladder. The painter has gained momentum in the amount of
A. 240 J.
B. 2352 J.
C. 784 J.
D. Can't say without knowing his velocity change (if any)
Answer: D
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A refrigerator extracts 65 J of heat from a heat reservoir at
If the coefficient of performance of the refrigerator is 2.5, then how much work is needed to run the refrigerator?
A. 26 J B. 48 J C. 75 J D. 90 J
Suppose you built a scale-model atom in which the nucleus is the size of a tennis ball. About how far would the cloud of electrons extend?
A) several kilometers B) several centimeters C) a few meters D) to the Sun
Two strings of identical material and radius are stretched with the same tension with their ends fixed, but one string is 8.0 mm longer than the other. Waves on these strings propagate at 420 m/s
The fundamental frequency of the longer string is 528 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency? A) 22 Hz B) 11 Hz C) 16 Hz D) 5.5 Hz E) 27 Hz
What is one atomic mass unit?
a. The mass of a hydrogen atom at the Earth's surface. b. The mass of an oxygen atom in outer space. c. The mass of a carbon atom. d. One-twelfth of a carbon atom. e. One-twentieth the mass of a uranium atom.