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100g of water is heated from 30^@C to 50...

100g of water is heated from `30^@C to 50^@C`. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is `4184J//kg//K`):

A

`84kJ`

B

`2.1kJ`

C

`4.2kJ`

D

`8.4kJ`

Text Solution

Verified by Experts

The correct Answer is:
D
`Q = msDeltatheta= 0.1 xx 4184 xx 20 = 8.4kJ`
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ALLEN -GEOMETRICAL OPTICS-EXERCISE - 05 (A)
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