Physics · Thermodynamics
In a cold storage, ice melts at the rate of 2 kg per hour when the external temperature is 20 °C. The minimum power output of the motor used to drive the refrigerator which just prevents the ice from melting is: (latent heat of fusion of ice = 80 cal/g, 1 cal = 4.2 J)
- 116.4 W
- 29.75 W
- 313.6 W✓
- 428.5 W
Correct answer
13.6 W
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