Water falls from height 500,m . rise in temperature of water at bottom if whole of energy remains in

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10-1.Thermometry, Thermal Expansion and Calorimetry

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Water falls from height $500\,m$. The rise in temperature of water at bottom if whole of energy remains in water, will be ........ $^oC$ [sp. heat of water $4.2\,KJ/kg$ ]

A

$0.23$

B

$1.16$

C

$27$

D

$1.02$

Solution

By energy conservation

$\mathrm{mgh}=\mathrm{ms} \Delta \mathrm{T}$

$\Delta \mathrm{T}=\frac{\mathrm{gh}}{\mathrm{S}}=\frac{9.8 \times 500}{4200}$

$1.16^{\circ} \mathrm{C}$

Standard 11

Physics

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