Test Preparation on Rotational Motion-III-Physics Test Series For NEET 2020

An automobile engine develops 100 kW when rotating at a
speed of 1800 rev/min. What torque does it deliver

A mass m hangs with the help of a string wrapped around a
pulley on a frictionless bearing. The pulley has mass m and
radius R. Assuming pulley to be a perfect uniform circular
disc, the acceleration of the mass m, if the string does not
slip on the pulley, is

An automobile moves on a road with a speed of 54 kmh-1.
The radius of its wheels is 0.45 m and moment of inertia of
the wheel about its axis of rotation is 3 kg m2. If the vehicle
is brought to rest in 15s, the magnitude of average torque
transmitted by its brakes to the wheel is

A constant torque acting on a uniform circular wheel
changes its angular momentum from  A0 to  4A0 in 4
seconds. The magnitude of this torque is