b. What is the distance between the observer and each of the speakers after he h
ID: 1386994 • Letter: B
Question
b. What is the distance between the observer and each of the speakers after he has moved from the midpoint? c. What is the frequency of the sound emitted by the speakers? 9. (18 points) A Carnot heat engine operates between two heat reservoirs. The hot reservoir is a vat of boiling water (T=373K) and the cold reservoir is a block of aluminum (T=?). a. 1f the engine does enough work to lift a 375kg object vertically through 3.66m at a constant speed and absorbs 38.4kJ from the water to do so, what is the temperature of the aluminum block? b. During this process, how much heat is exhausted into the aluminum block? c. What is the entropy change of the aluminum during this process? d. What is the entropy change of the whole system during this process?Explanation / Answer
Source tempearture T = 373 K
Mass m =375 kg
Height h = 3.66 m
Work done W = mgh
Where g = 9.8 m/s 2
So, W = 13450.5 J
Efficiency n = W / Q
Given Q = 38.4 kJ = 38400 J
So, n = 0.35
We know n = 1-( T ' / T )
T ' / T = 1- n
= 0.65
Sink temperature T ' = 0.65 T
= 242.4 K
(b). Q ' / Q = T ' / T
From this heat exhausted Q ' = ( T ' / T ) Q
= 24949.5 J
(c).Entropy change of the aluminium dS = Q ' / T '
= 102.9 J / K
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