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Calculate the final temperature of the mixture of water. Find the time taken by a 500 W heater to raise the temperature of 50 kg of material of specificheat capacity `960 "J kg"^-1"K"^-1`, from 18°C to 38° C. assume that all the heat energy supplied by the heater is given to the material. Describe a method to determine the specific heat capacity of a solid (say, a piece of copper). How does green house effect help in keeping the temperature of earth’s surface suitable for living of human beings? A substance is in the form of a solid at 0°C. Explain, why do sandy soils, get heated up quickly as compared to wet soils? 1 kg of water is contained in a 1.25 kW kettle. 1 cal/gram C o = 4186 J/kg o C ; 1 J/kg C o = 10-3 kJ/kg K = 10-3 J/g C o = 10-6 kJ/g C o = … An equal quantity of heat is supplied to two substances A and B. Why do doctors advise to put a strip of wet cloth on the forehead of a person having high fever (temperature)? State the condition for the flow of heat energy from one body to another. Steam at 100°C is passed over 1000 g of ice at 0°C. If the specific heat capacity of water is 4.2 J/g°C and of copper is 0.4 J/g°C, find: (i) the heat gained by water, (ii) the heat gained by calorimeter, (iii) total heat supplied by the metal piece, and (iv) the specific heat capacity of metal. A piece of iron of mass 2.0 kg has a thermal capacity of `966 "J" "K"^-1`. Let mass of ice added be x then we have heat lost by water = Heat used by ice. Explain, why is water sprayed on roads in evening in hot summer? Write the approximate values of the specific latent heat of fusion of ice. A Bunsen burner raises the temperature of 500g of water from 10°C to 100°C in 5 minutes. What impact will global warming have on the health of the affected population? Find the mass of water used. If, in a central heating system, steam enters a radiation pipe at 100°C and water leaves the radiation pipe at 100°C, can this radiation pipe heat a room? If the specific latent heat of ice is 336 J/g, find the specific heat capacity of copper. (a) The heat lost by steam in terms of m1, (b) The heat gained by ice in terms of m2, (ii) Form a heat equation find the ratio of m2 : m1, Specific latent heat of vaporization of steam = 2268 kJ/kg, Specific latent heat of fusion of ice = 336 kJ/kg, Specific heat capacity of water = 4200 J/kg°C. To enable Verizon Media and our partners to process your personal data select 'I agree', or select 'Manage settings' for more information and to manage your choices. (ii) What conclusion can you draw regarding the 110°c nature of ice from the above graph? What can you say about the heat capacity of A as compared to that of B? (Specific latent heat of fusion of ice = 336 J/g, specific latent heat of vaporization of steam = 2260 J/g, specific heat capacity of water = 4.2 J/g°C). that can be asked in the final exam. Write down the expression for the heat Q supplied. Some heat is provided to a body to raise its temperature by 25°C. Why water get cooled in a ‘Surahi’ in hot season? Name two factors on which the heat absorbed or given out by a body depends. Why does the heat supplied to a substance during its change of state not cause any rise in its temperature? [Specific heat capacity of water = 4.2 J g-1 ° C-1 Specific latent heat of fusion of ice = 336 J g-1], A. hot solid of mass 60 g at 100°C is placed in 150 g of water at 20° C. The final steady temperature recorded is 25°C. Explain, why are big tubs of water kept in underground cellars for storing fresh fruit and vegetables in cold countries. Calculate the total amount of heat required to convert 100g ice at 0°C to steam at 100°C. A heater supplies heat at the rate of 800 J/s. 250 g of water at 30 °C is present in a copper vessel of mass 50 g. Calculate the mass of ice required to bring down the temperature of the vessel and its contents to 5 °C.Specific latent heat of fusion of ice = 336 × 103 J kg-1Specific heat capacity of copper vessel = 400 J kg-1 °C-1Specific heat capacity of water = 4200 J kg-1 °C-1. 1 kg of water freezes to form ice at 0°C. Explain why water is used in hot water bottles for fomentation and also as a universal coolant. Specific latent heat of fusion of ice = 336 Jg-1. A copper calorimeter of mass 50g contains 100g of water at 20°C. When it is allowed to solidify at the same temp, it gives out 75000 J of heat. Specific heat capacity of substance A is 3.8 J g-1 K-1whereas the specific heat capacity of substance B is 0.4 J g-1 K-1. 50 g of ice at 0°C is added to 300 g of a liquid at 30°C. What impact will global warming have on the lakes and oceans?

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