1.

retrigerator converts 100 g of water at 20°C to iceat 10°C in 73.5 min. Calculate the average rate ofheat extraction in watt. The specific heat capacity ofwater is 4.2 J g K-1, specific latent heat of ice is336 J g1 and the specific heat capacity of ice isAns. 10 w21 Jg K-

Answer»

Total amount of heat = 8400 + 33600 + 2100 = 44100J.

Time taken = 73.5min = 4410s.

Average rate of heat extraction (power).

P = E/t = 44100/4410 = 10W



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