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If 50 calories are added to a system and...

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

A

20 cal

B

50 cal

C

40 cal

D

30 cal

Text Solution

Verified by Experts

The correct Answer is:
A
`Delta U = q + W `
` q= + 50` ( heat is added )
`W =- 30 ` (W.D . On surrounding )
`Delta U = 20 cal `
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