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 $
