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A copper calorimeter, blackened outside,...

A copper calorimeter, blackened outside, is filled with some hot liquid and placed on a table. It is found to cool from `60^(@)C` to `50^(@)C` in 4 minutes and `40^(@)C` to `30^(@)C` in 8 minutes. What is the temperature of the surroundings? Why is blackened?

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The correct Answer is:
`15^(@)C`, to promote radiation
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NN GHOSH-CALORIMETRY-All Questions
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  2. Find the result of mixing 1kg of ice at 0^(@)C with 1.5kg of water at ...

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  6. How should 2kg of water at 60^(@)C be divided so that when one part of...

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  7. The specific heat capacities of n liquid are s(1),s(2),s(3),……..s(n) r...

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  8. 1kg of ice at 0^(@)C contracts by 91x10^(-6)m^(3) on melting. A solid ...

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  9. The volume of a mixture of ice and water is found to decrease by 0.125...

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  10. A body cools from 50^(@)C to 40^(@)C is 5 minutes when its surrounding...

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  11. A copper calorimeter, blackened outside, is filled with some hot liqui...

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  12. The temperature of a body falls from 30^(@)C to 20^(@)C in 5 minutes. ...

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  13. A body initially at 80^(@)C cools to 64^(@)C in 5 minutes and to 52^(@...

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  14. A liquid of denisty 850kgm^(-3) flows through a calorimeter at the ra...

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  15. The temperature of three different liquids A,B and C are 14^(@)C, 24^(...

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  16. A calorimeter contains ice. Determine the heat capacitiy of the calori...

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  17. In an industrial process 10 kg of water per hour is to be heated from ...

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  18. About 5g of water at 30^(@)C and 5g of ice at -20^(@)C are mixed toget...

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  19. A vessel is completely filled with 500g of water and 1000g of mercury....

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  20. Ice with mass m(1)=600g and at temperature t(1)=-10^(@)C is placed int...

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