A certain heat engine extracts 1.30 kJ of heat from a hot temperature reservoir and discharges 0.70 kJ of heat to a cold temperature reservoir. What is the efficiency of this engine?
A) 54% B) 86% C) 46% D) 13% E) 27%
C
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You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1370 Hz
You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1330 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s. A) 38.4 m/s B) 30.0 m/s C) 39.2 m/s D) 40.0 m/s E) 41.7 m/s
At the highest point on the path of a projectile, its vertical acceleration
a. equals g pointing downwards. b. equals g pointing upwards. c. is zero. d. is undetermined. e. does not exist.
A 29.0-pm-wavelength photon is scattered by a stationary electron. What is the maximum energy loss the photon can have?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 4.0 keV B) 6.1 keV C) 10 keV D) 12 keV E) 15 keV
What is not a life-cycle cost associated with a power plant?
a. capital cost b. maintenance c. cost of electricity sold d. fuel cost e. staffing