A heat engine exhausts 3 000 J of heal while performing 1 500 J of useful work W

Question

A heat engine exhausts 3 000 J of heal while performing 1 500 J of useful work What efficiency of the engine? 15% 33% 50% 60% According to the second law of thermodynamics, which of the following applies to the received from a high temperature reservoir by a heat engine operating in a complete must be completely converted to work equals the entropy increase converted completely into internal energy cannot be completely converted to work A large spring requires a force of 150 N to compress it only 0.010 m. What is the constant of the spring? 125 000 N/m 15 000 N/m 15 N/m 1.5 N/m if a radio wave has speed 3.00 Times 108 m/s and frequency 94.7 MHz, what is 8.78 m 1.20 m 2.50 m 3.17m A sound wave coming from a tuba has a wavelength of 1.50 m and travels to speed of 345 m/s. What is the frequency of the sound you hear? 517 Hz 1/517 Hz 230 Hz 1/230 Hz The speed of sound at 0°C is 331 m/s. What is the speed of sound at 25°C?

Explanation / Answer

6) efficiency n = work/heat = 1500/3000 = 0.5 = 50%

option C

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7) option D

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8)

for a spring

Force is propotional to extension

F = Kx

contant k = F/x

k = 150/.01 = 15000 n

option B

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9)

speed = wavelength * freqency

wavelngth = speed/f = 3e8/94.7e6 = 3.17 m

option D

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10)

fo = v/wavelength = 345/1.5 = 230 Hz

option C

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