A calorimeter containing first `50g` and then `80g` of water is heated and kept in same surrounding. It is found that the time to cool from `40^(@)C` to `30^(@)C` in the two cases was `28` and `43` minutes respectively. Water equivalent (in g) of the calorimeter is

When a calorimeter contains 40g of water at 50^(@)C , then the temperature falls to 45^(@)C in 10 minutes. The same calorimeter contains 100g of water at 50^(@)C , it takes 20 minutes for the temperature to become 45^(@)C . Find the water equivalent of the calorimeter.

A calorimeter containes 50g of water at 50^(@)C . The temperature falls to 45^(@)C in 10 minutes. When the calorimeter contains 100g of water at 50^(@)C it takes 18 minutes for the temperature to become 45^(@)C . Find the water equivalent of the calorimeter.

Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5 minutes and to 54^(@)C in the next 5 minutes. The temperature of the surrounding is

A liquid cools from 70^(@) C to 60^(@) C in 5 minutes. If the temperautre of the surrounding is 30^(@) C, what is the time taken by the liquid to cool from 50^(@) C to 40^(@) C ?

250 g of water and equal volume of alcohol of mass 200 g are replaced successively in the same calorimeter and cool from 60^@C to 55^@C in 130 s and 67 s, respectively. If the water equivalent of the calorimeter is 10 g, then the specific heat of alcohol in cal//g^@C is

250 g of water and equal volume of alcohol of mass 200 g are replaced successively in the same colorimeter and cool from 606^@C to 55^@C in 130 s and 67 s, respectively. If the water equivalent of the calorimeter is 10 g, then the specific heat of alcohol in cal//g^@C is

A calorimeter contains 10 g of water at 20^(@)C . The temperature falls to 15^(@)C in 10 min. When calorimeter contains 20 g of water at 20^(@)C , it takes 15 min for the temperature to becomes 15^(@)C . The water equivalent of the calorimeter is

A body in a room cools from 85^(@) C to 80^(@) C in 5 minutes. Calculate the time taken to cool from 80^(@) C to 75^(@) C if the surrounding temperature is 30^(@) C.

A body cools from 50^(@)C to 40^(@)C in 5 min. The surroundings temperature is 20^(@)C . In what further times (in minutes) will it cool to 30^(@)C ?

A calorimeter contains 0.2 kg of water at 30^(@)C 0.1 kg of water at 60^(@)C is added to it, the mixture is well stirred and the resulting temperature is found to be 35^(@)C . The thermal capacity of the calorimeter is: