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What is the change is potential energy (...

What is the change is potential energy (in calories) of a 10 kg mass after 41.8m fall?

A

`1980 cal`

B

`2980 cal`

C

`980 cal`

D

`3980 cal`

Text Solution

Verified by Experts

The correct Answer is:
C
Change in potential energy
`Delta U=mgh=10xx10xx41.8=4180J`
If mechanical work/energy(W) in joule produces the same temperature change as heat (H), we write,
`W=JH`
Where `J=4.18` is called mechanical equivalent of heat. J is expressed in joule/calorie.
Hence, equivalent calories will be
`H=(DeltaU)/(J)=(4180)/(4.18)=1000cal`
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