Properties Of Solids And Liquids Question 55
Question: Of two masses of 5 kg each falling from height of 10 m, by which 2kg water is stirred. The rise in temperature of water will be [RPET 1997]
Options:
A) 2.6°C
B) 1.2°C
C) 0.32°C
D) 0.12°C
Show Answer
Answer:
Correct Answer: D
Solution:
$ W=JQ $
therefore $ (2m)gh=J\times {m}‘c\Delta \theta $
therefore $ 2\times 5\times 10\times 10=4.2(2\times 1000\times \Delta \theta ) $
therefore $ \Delta \theta =0.1190{}^\circ C=0.12{}^\circ C $
