The time taken by an electric heater to rise the temperature of 100cc of water through `10^(@)C` is 7s. If there is no loss in energy. Power of that motor is (J=4.2J/cal)

A calorimeter takes 200 cal of heat to rise its temperature through 10^(@) C. Its water equivalent in gm is

A calorimeter takes 200 cal of heat to rise its temperature through 10^@C . Its water equivalent in gm is

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

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 )

A calorimeter takes 400 cal of heat to rise its temperature through 10C .Its water equivalent in gm is N times10 then the value of N is

A metal block is placed in a room which is at 10^(@)C for long time. Now it is heated by an electric heater of power 500 W till its temperature becomes 50^(@)C . Its initial rate of rise of temperature is 2.5^(@)C//sec . The heater is switched off and now a heater of 100W is required to maintain the temperature of the block at 50^(@)C . (Assume Newtons Law of cooling to be valid) What is the rate of cooling of block at 50^(@)C if the 100W heater is also switched off?

A metal block is placed in a room which is at 10^(@)C for long time. Now it is heated by an electric heater of power 500 W till its temperature becomes 50^(@)C . Its initial rate of rise of temperature is 2.5^(@)C//sec . The heater is switched off and now a heater of 100W is required to maintain the temperature of the block at 50^(@)C . (Assume Newtons Law of cooling to be valid) What is the rate of cooling of block at 50^(@)C if the 100W heater is also switched off?

A metal block is placed in a room which is at 10^(@)C for long time. Now it is heated by an electric heater of power 500W till its temperature becomes 50^(@)C Its initial rate of rise of temperature is 2.5^(@)C//sec The heater is switched off and now a heater of 100W is required to maintain the temperature of the block at 50^(@)C The heat radiated per second when the block was 30^(@)C is given as alpha watt. Find the value of ((alpha)/(10)) (Assume Newton's law of cooling to be valid .

10 g of water is supplied with 420 J of energy. The rise in temperature of water is