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Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsMedium2 minPYQ_2013

PhysicsMediumsingle choice

The velocity of a car travelling on a straight road is $3.6 kmh^{- 1}$ at an instant of time. Now travelling with uniform acceleration for $10 s$ , the velocity becomes exactly double. If the wheel radius of the car is $25 cm$ , then which of the following is the closest to the number of revolutions that the wheel makes during this 10 s?

Options:

Answer:

Solution:

We have, $θ = 2 πn = \frac{( \frac{v _{f}^{2}}{r ^{2}} - \frac{v _{1}^{2}}{r ^{2}} )}{( 2 \frac{a}{r} )}$ $n = \frac{v _{f}^{2} - v _{i}^{2}}{( 2 a r ) ( 2 π )} = 95$

Stream:WBJEESubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2013

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