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Q.

A waterfall is 84 meters high. If half of the potential energy of the falling water gets converted to heat, then rise in temperature of water will be

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a

0.098°C

b

9.8°C

c

0.98°C

d

0.0098°C

answer is A.

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Detailed Solution

W=JQ 12(mgh)=J×mcΔθ⇒Δθ=gh2JS     ∴Swater =4200Jkg×0C
⇒Δθ=9.8×842×4200=0.0980C

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A waterfall is 84 meters high. If half of the potential energy of the falling water gets converted to heat, then rise in temperature of water will be