Question

A wheel of moment of inertia 50kgm^2 is running at 240 rpm. Calculate the K.E. lost by it when its speed falls to 120 rpm.

Answer 1

this is answer for this question these questions are so simple

Answer 2

Answer:

Concept:

Kinetic energy is proportional to the velocity and mass of the body. If the velocity of the body is 0, the kinetic energy is also zero.

Explanation:

To Find Kinetic Energy we have the formula

$\\ K \cdot E=\frac{1}{2} l w^{2}\\ \\Case I\\\\ K E_{1}=\frac{1}{2} \times 50 \times 240=6000 \\\\Case II\\\\ K E_{1}=\frac{1}{2} \times 50 \times \ 120=3000 \\\\difference = Case I -Case II \\\\= 6000-} 3000 \\\\lost =3000 \mathrm{~kg} \mathrm{~m}^{2}$

Hence the K.E lost by the wheel when its speed falls to 120 rpm is 3000.

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