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A calorimeter of mass 0.2 kg and specifi...

A calorimeter of mass `0.2 kg` and specific heat `900 J//kg-K`. Containing `0.5 kg` of a liquid of specific heat `2400 J//kg-K`. Its temperature falls from `60^(@)C` to `55^(@)C` in one minute. Find the rate of cooling.

A

5 J`//`s

B

15 `J//s`

C

100 `J//s`

D

115 `J//s`

Text Solution

Verified by Experts

The correct Answer is:
D
Rate of cooling (rate of heat loss) -
`(dQ)/(dt) = (mc +W)(dT)/(dt)=(m_l c_l +m_c c_c)(dT)/(dt)`
`implies (dQ)/(dt)=(0.5 xx 2400 + 0.2 xx 900 )((60-55)/(60))=115` J `//` s
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