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qUESTIONS

MCQs-PYQs-12th-jee

The moment of inertia of a body about a given axis is 1.2 kg m2. · Initially, the body is at rest. In order to produce a rotational kinetic energy of 1500 J, an angular acceleration of 25 rad/s2 must be applied about that axis for a duration of

MCQs-PYQs-12th-jee

A solid spherical ball rolls on an inclined plane without slipping. The ratio of rotational and total energy is

MCQs-PYQs-12th-jee

A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its centre of mass is K, If radius of the ball be R, then the fraction of total energy associated with its rotational energy will be

MCQs-PYQs-12th-jee

A round disc of moment of inertia I2 about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I1 rotating with an angular velocity ω about the same axis. The final angular velocity of the combination of discs is.

MCQs-PYQs-12th-jee

A small mass attached to a string rotates on a frictionless table top as shown in Fig. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will

MCQs-PYQs-12th-jee

When a man stands on a turn-table stretching with two equal loads in hand and rotates. Then he folds his arm. Which of the following statements is correct?

MCQs-PYQs-12th-jee

The principle of conservation of angular momentum, states that angular momentum

MCQs-PYQs-12th-jee

A uniform heavy disc is rotating at constant angular velocity ω about a vertical axis through its centre and perpendicular to the plane of the disc. Let L be its angular momentum. A lump of plasticine is dropped vertically on the disc and sticks to it. Which of the following will be constant?

MCQs-PYQs-12th-jee

A cord is wound over the rim of a flywheel of mass 20 kg and radius 25 cm. A mass 2.5 kg attached to the cord is allowed to fall under gravity. Calculate the angular acceleration of the flywheel

MCQs-PYQs-12th-jee

A force F=2.0 N acts on a particlein the x z-plane. The force F is parallel to x-axis. The particle P (as shown in the figure) is at a distance 3 m and the line joining P with the origin makes angle 30^∘ with the x-axis. The magnitude of torque on P with respect to origin O( in N-m) is

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