A liquid of mass 250 is kept warm in a v...

A liquid of mass 250 is kept warm in a vessel using an electric heater. The liquid is maintained at `57^@C` when the power supplied by the heater is 30 W and surrounding temperature is `27^@C`. As the heater is switched off, it took 10 s time for the temperature of the liquid to fall from `47^@C` to `46.9^@C`. The specific heal capacity of the liquid is

`8000 J kg^-1 K^-1`

`9000 J kg^-1 K^-1`

`6000 J kg^-1 K^-1`

`12000 J kg^-1 K^-1`

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