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Question:
If 2 kcal, of heat is supplied to a system cause to change the internal energy of a gas is 5030J, and external work done is 3350 J, then what is mechanical equivalent of heat
Answer:

Given,

2kcal heat(energy) is supplied to change the internal energy of gas is 5030 J.

2kcal= 2000 cal

Work done= 3350 J

This work done converts in energy of the system.

So, total energy of the system is= 5030J+3350J= 8380 J

So, the mechanical equivalent = 8380/ 2000 = 4.19 J/cal

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