In the certain process, 400 Cal of heat are supplied to a system and at the same time 105 J of mechanical work was done on the system. The increase in its internal energy is

Question

In the certain process, 400 Cal of heat are supplied to a system and at the same time 105 J of mechanical work was done on the system. The increase in its internal energy is, 20 cal, 303 cal, 404 cal, 425 cal

MARKS App · Accepted Answer

d Q = 400 c a l , d W = - 105 J d U = d Q - d W d U = 400 - - 25 = 425 cal Note d W is negative because work is done on the system

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