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Mechanical Properties Of Fluids

Question
CBSEENPH11020524
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A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is [Latent heat of ice is 3.4 x 105 J/kg and g =10 N/kg]

  • 544 km

  • 136 km

  • 68 km

  • 34 km

Solution

B.

136 km

As per conservation of energy, energy gained by the ice during its fall from height h is given by,
straight E space equals space mgh
Given, only one-quarter of its energy is absorbed by the ice.
So, 
mgh over 4 space equals space m L subscript f rightwards double arrow space h space equals space fraction numerator m L subscript f space x space 4 over denominator m g end fraction space space space space space space space space space space equals space fraction numerator L subscript f x 4 over denominator g end fraction space space space space space space space space space equals space fraction numerator 3.4 space x space 10 to the power of 5 x 4 over denominator 10 end fraction space space space space space space space space equals space 13.6 space x space 10 to the power of 4 space space space space space space space space equals space 13600 space m space space space space space space space space space equals space 136 space k m

Some More Questions From Mechanical Properties of Fluids Chapter

What is the SI unit of molar specific heat?

Define heat capacity.

What are the units of heat capacity?

Define Dulong and Pettit’s law of specific heat.

Who explained the correct variation of specific heat with temperature in the lower range of temperature?

Do the gases have only one value of specific heat?

What is thermometry?

Define temperature.

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