A refrigerator has a performance coefficient (COP) of 1.15, and it extracts 7.95 J of energy from the cold reservoir during each cycle
(a) How much work is done on the gas in each cycle?
(b) How much energy is exhausted into the hot reservoir in each cycle?
(a) 6.91 J (b) 14.9 J
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What is the approximate surface temperature of a star with weak hydrogen absorption lines and strong absorption lines of ionized calcium?
A) 4,500 K B) 6,500 K C) 5,500 K D) 3,500 K
On planet Z, the standard unit of length is the foose. Ann the Astronaut is 5.2 feet tall on Earth. She lands on planet Z and is measured to be 88 foosi tall. Her partner Rachael is 92 foosi tall. How tall is Rachael on Earth?
a. 5.9 feet b. 5.4 feet c. 5.2 feet d. 5.1 feet e. 5.6 feet
In a system of N gas molecules, the individual speeds are v1, v2, ..., vN . The rms speed of these molecules is:
A. 1 N ?v1 + v2 + ... + vN B. 1 N v2 1 + v2 2 + ... + v2 N C. (v2 1 + v2 2 + ... + v2 N )/N D. [(v1 + v2 + ... + vN )/N] 2 E. 0(v1 + v2 + ... + vN )2/N
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.