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In a certain experiment, liquid helium at an initial temperature of is to be further cooled by bringing it into contact with a paramagnetic salt which is initially at temperature . The heat capacity of liquid helium is expressed as and that of salt is expressed as . Assume that the mixture is thermally and mechanically isolated and no work is done during the process. If the final temperature of the system is , the initial temperature of the salt is
(a)
(b)
(c)
(d)

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Important Questions on Thermal Properties of Matter
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Two identical blocks of ice move in opposite directions with equal speed and collide with each other. What will be the minimum speed required to make both the blocks melt completely, if the initial temperatures of the blocks were each? (Specific heat of ice is and latent heat of fusion of ice is

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Assuming no loss of heat to the environment, the mass of ice in the final mixture is closest to

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(Given: room temperature , specific heat of copper )

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