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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Application +4 | -1

A wheel of mass

20 \mathrm{~kg}

and radius

30 \mathrm{~cm}

is rotating at an angular speed of

80 \mathrm{~rev} / \mathrm{min}

when the motor is turned off. Neglecting the friction at the axis, calculate the force that must applied tangentially to the wheel to bring it to rest in 5 revolution.

View answer and explanation

Correct option: A

1.06\,\pi \mathrm{N}

Option A (

1.06\pi \mathrm{N}

) is correct because it is the tangential force required to bring the wheel to rest in 5 revolutions, calculated using rotational kinematics and torque.

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t = 1\,sec

\left( {rad\,{s^{ - 2}}} \right)