# Answer to Question #72013 in Molecular Physics | Thermodynamics for jojo

Question #72013

Water at a temperature of 15°C produces ice cubes at a temperature of −5°C. Water is taken in at the

rate of 1 kg every 7 minutes and the input power to the machine is 300 W. The specific heat capacity of

water is 4187 Jkg−1K

−1, the specific heat capacity of ice is 2100 Jkg−1K

−1 and the specific latent heat of

fusion is 335 Jkg−1

i) Calculate the heat energy extracted per kg of ice produced

ii) Calculate the thermal efficiency of the ice making machine.

rate of 1 kg every 7 minutes and the input power to the machine is 300 W. The specific heat capacity of

water is 4187 Jkg−1K

−1, the specific heat capacity of ice is 2100 Jkg−1K

−1 and the specific latent heat of

fusion is 335 Jkg−1

i) Calculate the heat energy extracted per kg of ice produced

ii) Calculate the thermal efficiency of the ice making machine.

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