Properties Of Solids And Liquids Question 52

Question: The height of a waterfall is 84 metre. Assuming that the entire kinetic energy of falling water is converted into heat, the rise in temperature of the water will be $ (g=9.8m/s^{2},\ J=4.2joule/cal) $ [MP PET 1994]

Options:

A) 0.196°C

B) 1.960°C

C) 0.96°C

D) 0.0196°C

Show Answer

Answer:

Correct Answer: A

Solution:

$ W=JQ $

therefore $ mgh=J(m.c.\Delta \theta ) $

therefore $ \Delta \theta =\frac{gh}{Jc}=0.0023h=0.0023\times 84=0.196{}^\circ C $



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