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प्रश्न
1 kg of water freezes to form ice at 0°C. What amount of heat is withdrawn?
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उत्तर
3,36,000 J.
संबंधित प्रश्न
What property of water makes it an effective coolant?
Heat supplied to a solid change it into liquid. What is this change in the phase called?
Write the approximate value of specific heat capacity of water in S.I. unit.
Name two green house gases ?
m kg of a substance of specific heat capacity s J/kg °C is heated so that its temperature rises from θ1°C to θ2°C. Write down the expression for the heat Q supplied.
Does the specific heat capacity of a substance depend upon its mass and rise in temperature only?
Derive an expression for finding out the specific heat capacity of a body (solid) from the readings of an experiment given below:
(i) Mass of empty calorimeter (with stirrer) = m1 gm
(ii) Mass of the metal piece = M gm
(iii) Mass of colorimeter and water = m2 gm
(iv) Initial temperature and water = t1°C
(v) Temperature of hot solid (metal piece) = t2 °C
(vi) Final temperature of the mixture = t°C
(vii) Specific heat of calorimeter = 0.4 J gm / °C
Explain how heat capacity of a solid can be determined by the method of mixture.
50 g of copper is heated to increase its temperature by 10° C. If the same quantity of heat is given to 5 g water, the rise in its temperature is [Specific heat of copper = 420 joule-kg-1 °C-1 , specific heat of water = 4200 joule-kg-I °C-1]
Calculate the amount of heat energy required to raise the temperature of 200 g of copper from 20°C to 70°C. Specific heat capacity of copper = 390 J kg-1 K-1.
