How much will the temperature of 100g of water be rised by doing 4200 J of work in stirring the water?

4200 J of work is required for

Water of volume 4L in a closed container is heated with a coil of 2 kW. While water is heated, the container loses energy at a rate of 120 J/s. In how much time will the temperature of water rise from 27^(@)C to 77^(@)C ? (Specific heat of water is 4.2 kJ/kg and that of the container is negligible).

Water of volume 2L in a closed container is heated with a coil of 1 kW. While water is heated, the container loses energy at a rate of 160 J/s. In how much time will the temperature of water rise from 27^(@)C" to "77^(@)C ? (Specific heat of water is 4.2 kJ / kg and that of the container is negligible).

How much heat to be supplied to raise the temperature of 100 g water from 20^(@)C to the normal boilling point of water ?

How much time heater will take to increase the temperature of 100g water by 50^(@)C , if resistance of heating coil is 484Omega and supply voltage is 220V

A piece of ice of mass 100 g and at temperature 0^@ C is put in 200 g of water of 25^@ C . How much ice will melt as the temperature of the water reaches 0^@ C ? (specific heat capacity of water =4200 J kg^(-1) K^(-1) and latent heat of fusion of ice = 3.4 xx 10^(5) J Kg^(-1) ).

A piece of ice of mass 100 g and at temperature 0^@ C is put in 200 g of water of 25^@ C . How much ice will melt as the temperature of the water reaches 0^@ C ? (specific heat capacity of water =4200 J kg^(-1) K^(-1) and latent heat of fusion of ice = 3.4 xx 10^(5) J Kg^(-1) ).

How much water do we waste ?