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Standard XII

Physics

Gravtiational PE

A vessel cont...

Question

A vessel containing $50 k g$ of water is placed at a height $15 m$ above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? Consider $g = 10 m s^{- 2}$ .

5.0 k J

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7.5 k J

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10.0 k J

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12.5 k J

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Solution

The correct option is B $7.5 k J$
Given, $m = 50 k g, h = 15 m, g = 10 m s^{- 2}$
$∴ U = m g h = 50 \times 15 \times 10 = 7500 J = 7.5 k J$

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A vessel containing 50kg of water is placed at a height 15m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? Consider g=10ms−2.

The correct option is B 7.5kJGiven, m=50kg,h=15m,g=10ms−2∴U=mgh=50×15×10=7500J=7.5kJ

A vessel containing $50 k g$ of water is placed at a height $15 m$ above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? Consider $g = 10 m s^{- 2}$ .

The correct option is B $7.5 k J$
Given, $m = 50 k g, h = 15 m, g = 10 m s^{- 2}$
$∴ U = m g h = 50 \times 15 \times 10 = 7500 J = 7.5 k J$