Thermodynamic Devices: If the efficiency of a reversible engine is 28%, what is its COP (performance coefficient) operated (a) as a refrigerator, and (b) as a heat pump?
Fill in the blank(s) with the appropriate word(s).
(a) 2.6 (b) 3.6
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When we look toward the constellation Sagittarius, we are looking
A) at the galaxy's central bulge. B) toward Polaris, the "Pole Star." C) toward the Winter Triangle. D) out toward the outer Milky Way.
Consider a classroom 10.0 m long by 6.0 m wide by 4.0 m high at "room temperature" 20.°C and 1.0 atmosphere
(a) How many moles of gas are contained in the room? (b) Assuming an average molecular weight of 28, what is the mass of the room air?
Give some examples of simple harmonic motion:
a. Mass and spring b. pendulum c. light d. a and B
If you rub two transparency sheets with tissue and then hold the two transparency sheets at rest a short distance apart, they will then exert
A) a repulsive electric force on each other, but no magnetic force. B) a repulsive magnetic force on each other, but no electric force. C) an attractive electric force on each other, but no magnetic force. D) an attractive magnetic force on each other, but no electric force. E) no electric or magnetic forces on each other.