A reversible engine takes in heat at a rate of 555 W and exhausts heat at 482 W
(a) How much power does it produce?
(b) What is its efficiency?
(c) If operated in reverse as a refrigerator, what would be its performance coefficient (COP)?
(a) 73 W (b) 13.2% (c) 6.6
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A sound intensity of 70 dB is observed at a distance d from the source of sound. What sound intensity would be observed at a distance 2d from the source?
a. 68 dB b. 67 dB c. 64 dB d. 62 dB
An auditorium has dimensions 10 m × 10^ m × 60 m. How many moles of air fill this volume at one atmosphere and 0°C?
a. 2.7 × 10^2 b. 2.7 × 10^4 c. 2.7 × 10^3 d. 2.7 × 10^5 e. 2.7 × 10^6
A device that makes use of a bimetallic strip is a
a. thermometer b. thermostat c. choke control in an old automobile d. all of the above e. none of the above
A mass attached to a spring is drawn back 2 cm from equilibrium and released. If a second spring were used that had a smaller spring constant than the first but the mass was the same, which of the following would be larger?
A. Amplitude B. Initial restoring force C. Frequency D. Period