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Class 11 Physics Practice Test: System of Particles and Rotational Motion - Kinematics of Rotational Motion about a Fixed Axis
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Class 11 Physics Practice Test: System of Particles and Rotational Motion - Kinematics of Rotational Motion about a Fixed Axis
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8 Questions

1. A body is in pure rotational motion about an axis. Its angular acceleration is given by: a = 2t. What is the angular distance covered by the body from t=2s to t=3s? It starts from rest at t=0.
2. The rate of change of angular speed is constant. What will be the expression for change in angular speed after time dt, if angular acceleration is ‘a’? The initial angular speed is ‘w’.
3. A body has a moment of inertia = 5kgm2 about an axis. What should be the torque for increasing its angular speed from 0 to 10rad/s in 4s? Assume that the body rotates purely about that axis.
4. A ring of diameter 1m is rotating about a central axis perpendicular to its diameter. It is rotating with a speed of 10rad/s. What force should be applied on it tangentially to stop it in exactly 3 rotations? Let the mass of the ring be 2kg.
5. A circular disc is rotating about a central axis perpendicular to its diameter with a speed of 5rad/s. If a constant force of 2N is applied tangentially on it, in how much time will it come to a stop? Radius of disc = 1m & mass = 1kg.
6. The angular acceleration of a body = 3t2. What will be its speed at t=10s, if initial speed = 10rad/s?
7. The angular speed of a body is 2rpm. What should be the angular acceleration for the angular speed to double up in 5s?
8. A body is under an angular deceleration of 5rad/s2. Its initial speed is 3rad/s. How much angular distance ‘θ’ will it cover before coming to rest?

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