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Standard X

Physics

Kinetic Energy

A river of sa...

Question

A river of salty water is flowing with a velocity 2 m/ sec. If the density of the water is $1200 k g / m^{3}$ , then the kinetic energy of each cubic meter of water is

2.4 J

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24 J

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2.4 KJ

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4.8 KJ

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Solution

The correct option is B 2.4 KJ
Kinetic energy per cubic meter is $= \frac{1}{2} ρ v^{2}$ $= \frac{1}{2} \times 1200 \times 2^{2} = 2400 J = 2.4 K J$

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A river of salty water is flowing with a velocity 2 m/ sec. If the density of the water is 1200kg/m3, then the kinetic energy of each cubic meter of water is

The correct option is B 2.4 KJKinetic energy per cubic meter is =12ρv2 =12×1200×22=2400 J=2.4 KJ

A river of salty water is flowing with a velocity 2 m/ sec. If the density of the water is $1200 k g / m^{3}$ , then the kinetic energy of each cubic meter of water is

The correct option is B 2.4 KJ
Kinetic energy per cubic meter is $= \frac{1}{2} ρ v^{2}$ $= \frac{1}{2} \times 1200 \times 2^{2} = 2400 J = 2.4 K J$