An automobile moves on a road with a speed of 54 km 
. The radius of its wheels is 0.45 
and the moment of inertia of the wheel about its axis of rotation is 3 kg 
. If the vehicle is brought to rest in 15 
, the magnitude of average torque transmitted by its brakes to the wheel is
Text Solution
Verified by ExpertsC
: Here,
Speed of the automobile,
km 
Radius of the wheel of the automobile, 
Moment of inertia of the wheel about its axis of rotation, 
kg 
Time in which the vehicle brought to rest, 
The initial angular speed of the wheel is
rad 
and its final angular speed is
(as the vehicle comes to rest)
The angular retardation of the wheel is
rad 
The magnitude of required torque is
kg 
rad 
kg 
kg 
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