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When a calorimeter contains 40g of water...

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.

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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.

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The time taken for a calorimeter containing 75g of water at 62^(@)C to cool to 58^(@)C is 9 minutes. When the calorimeter contains 105g of water, it takes 12 minutes to cool from 62^(@)C " to " 58^(@)C . The water equivalent of the calorimeter is