If $50$ calorie are added to a system and system does work of $30$ calorie on surroundings, the change in internal energy of system is ________________.

20

cal

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50

cal

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40

cal

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30

cal

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Solution

The correct option is A $20$ cal
q= $Δ U + W$
50= $Δ$ U + 30
... $Δ$ U = 20 cal

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If 50 calorie are added to a system and system does work of 30 calorie on surroundings, the change in internal energy of system is ________________.

The correct option is A 20 cal q=ΔU + W∆U + W 50=Δ∆U + 30 ... Δ∆U = 20 cal

If $50$ calorie are added to a system and system does work of $30$ calorie on surroundings, the change in internal energy of system is ________________.

The correct option is A $20$ cal
q= $Δ U + W$
50= $Δ$ U + 30
... $Δ$ U = 20 cal