An electric heater supplies 1.8 kW of power in the form of heat to a tank of water. How long will it take to heat the 200 kg of water in the tank from `10^@` to `70^@`C ? Assume heat losses to the surroundings to be negligible.

Time taken by a 836 W heater to heat 1 litre of water from 10^@C to 40^@C is

A 100 watt immersion heater is placed in a pot containing 1 litre of waterr at 20^(@) C. How long will it take to heat water to boiling temperature if 20% of the available energy is lost to surroundings?

A 220V-500W aluminium electric kettle weighing 1.2kg is used to boil water from a 180V supply. How long will it take 1kg of water from 30^(@)C "to" 100^(@)C ? (Relative heat heat capacity of aluminimum =0.3)

The specific heat of water is 4180 J / kg°C . How much the heat capacity of 2 kg water ?

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).

A metal ball of mass 1.0 kg is kept in a room at 15^(@)C . It is heated using a heater. The heater supplies heat to the ball at a constant rate of 24 W. The temperature of the ball rises as shown in the graph. Assume that the rate of heat loss from the surface of the ball to the surrounding is proportional to the temperature difference between the ball and the surrounding. Calculate the rate of heat loss from the ball when it was at temperature of 20^(@)C .

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).