[" 31.An electric kettle of "2000W" is used to boil "20" litres of water.Find the time required to boil the water "],[" from its initial temperature of "20^(@)C" .Take specific heat of water as "4200Jkg^(-1)K^(-1)" ."]

An electric kettle of 2000 Wis used to boil 20 litres of water. Find the time required to boil to the water from its initial temperature of 20^(@)C . (Take specific heat of water as 4200 J kg^(-1) K^(-1) . Density of water = 1000kg m^(-3) )

Find the heat energy required to boil 5 kg of water iff its initial temperature is 30^(@)C (specific heat of water is 4200 J kg^(-1)" "k^(-1) and boiling point is 100^(@)C )

Obtain the value of specific heat of water in terms of Jkg^(-1)K^(-1) .

An electric kettle of 1200W has 1 kg water at 20^@C . The water equivalent of the kettle is 500g . The time required to heat water from 20^(@) to 100^(@)C will be (specific heat of water = 4200 J//kg^(@)C) .

Calculate the heat energy required to raise the temperature of 2 kg of water from 10^@ C to 50^@ C. Specific heat capacity of water is 4200 J kg^(-1) K^(-1) .

Calculate the heat energy required to raise the temperature of 2 kg of water from 10^@C to 50^@C . Specific heat capacity of water is 4200 JKg^(-1) K^(-1)

A 210 W heater is used to heat 100 g water. The time required to raise the temperature of this water from 25^(@)C to 100^(@)C is (specific heat capacity of water =4200" J/Kg-"^(@)C )

10 litres of hot water at 70^@C is mixed with an equal volume of cold water at 20^@ C . Find the resultant temperature of the water. (Specific heat of water = 4200 J//kg -K ).

An electric kettle was marked 500 W,220 V and was found to raise 1 kg of water to 20^(@) to the boiling point in 20 minutes. Calculate the heat efficiency of the kettle. Sp. Heat of water = 4200 J kg^(-1) K^(-1) .