A transformer actually transforms
A) energy from one value of voltage to another.
B) magnetic and electric field lines.
C) generators into motors.
D) motors into generators.
E) all of the above
Answer: A
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Multiple star systems in our galaxy
A) are extremely rare, making up less than 1% of the total B) are very common, making up about 50% of the total C) are fairly common, making up around 30% of the total D) do not exist
Which of the following processes is approximately reversible?
a) lighting a match b) pushing a block up a frictionless inclined plane c) frying an egg d) swimming across a pool e) stretching a spring by a small amount A. b only B. e only C. b, d and e D. b and e
Tarzan swings back and forth on a long vine. His friend Jane notices 30. swings in 2.4 minutes
(a) What is the frequency of the swing? (b) What is the vine length?
One mole of an ideal gas has a temperature of 25°C. If the volume is held constant and the pressure is doubled, the final temperature (in °C) will be
a. 174 b. 596 c. 50 d. 323 e. 25