Home > 0877 > GR0877 Problem 35

## GR0877 Problem 35

PROBLEM STATEMENT: This problem is still being typed.

SOLUTION: (B) Assuming a heat pump is an ideal Carnot engine for its efficiency one has $\eta = W/Q_H = 1 - T_C/T_H$, where $W$ is the work done by the system, $Q_H$ is the heat put into the system, $T_C, T_H$ are the absolute temperatures of the cold and hot reservoirs. $W = Q_H(1 - T_C/ T_H) = 15000 \cdot (1 - 280/300) = 15000/15 = 1000$ (J).

Found a typo? Comment!

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

Want to get a full PDF with solutions? Read THIS.

The comments appending particular solutions are due to the respective users. Educational Testing Service, ETS, the ETS logo, Graduate Record Examinations, and GRE are registered trademarks of Educational Testing Service. The examination questions are © 2008 by ETS.