Question

5)

A river salty water is flowing with a velocity of 4m/s. If the density of the water is
2.4gm/c.c Then the kinetic energy of each of cubic metre of water is
1. 19.2 kJ
2. 4.8 kJ
3. 2.4kJ
4.9.8kJ
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Answer 1

Answer:

2.4 KJ is the correct answer Dude ✌

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@PrincessPalak

Answer 2

Answer:

Concept:

A particle or an item that is in motion has a sort of energy called kinetic energy. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.

Explanation:

Given:

$velocity \ of \ river, (\mathrm{v})=4 \mathrm{~m} / \mathrm{s}$

$Density \ of \ water, \rho= 2.4 \mathrm{~g} / \mathrm{cc}$

Find:

The Kinetic Energy of each cubic meter of water

Solution:

First, let us find out the "m" that is mass in the kinetic energy formula

Mass of each cubic meter:

To Calculate the mass of each cubic meter we have the formula,

           $&\quad \mathrm{m}=\frac{2.4 \times 10^{-3}}{10^{-2\left(3^{\prime}\right)}}=2.4 \times 10^{3} \mathrm{~kg}$

Now we know the formula for Kinetic energy,

  Kinetic Energy =  $\frac{1}{2} \mathrm{mv}^{2$

where, m = mass

             v = velocity

By substituting the values in the kinetic energy formula,

          K.E  $&=\frac{1}{2} \times 2.4 \times 10^{3} \times(4)^{2}$

          K.E  $&=19.2 \times 10^{3} \mathrm{~J}$

          K.E   $&=19.2 \mathrm{~kJ}$  

Hence the correct option is (1) 19.2 KJ

#SPJ3