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Calculate the change in internal energy ...

Calculate the change in internal energy of a block of copper of mass 200 g when it is heated from` 25^@ C` to `75^@ C.` Specific heat of copper `= 0.1 cal /g/ ""^(@)`C and assume change in volume is negligible.

Text Solution

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`dQ = cm Delta T = 0.1 xx 200 ( 75-25 ) = 100 ` calorie
` dW = pdv =0`
`dU = dQ - dW = 100 -0 =100 ` calorie `= 4200 J`
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