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qUESTIONS

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

MCQs-PYQs-12th-jee

A torque of 30 N-m is applied on a 5 kg wheel whose moment of inertia is 2 kg-m^2 for 10 sec. The angle covered by the wheel in 10 sec will be

MCQs-PYQs-12th-jee

A constant torque of 1000Nm turns a wheel of M.I 200kg m^2 about an axis through centre. the angular velocity after 3 sec is

MCQs-PYQs-12th-jee

A wheel of radius 0.4 m can rotate freely about its axis as shown in the figure. A string is wrapped over its rim and a mass of 4 kg is hung. An angular acceleration of 8rad−s −2 is produced in it due to the torque. Then, moment of inertia of the wheel is (g=10 ms −2 )

MCQs-PYQs-12th-jee

A 10 kg body hangs at rest from a rope wrapped around a cylinder 0.2 m in diameter. The torque applied about the horizontal axis of the cylinder is

MCQs-PYQs-12th-jee

A uniform rod of length ‘2L’ has mass per unit length ‘m’. The moment of inertia of the rod about an axis passing through its centre and perpendicular to its length is

MCQs-PYQs-12th-jee

Two rods each of mass m and length ℓ are joined at the centre to form a cross. The moment of inertia of this cross about an axis passing through the common centre of the rods and perpendicular to the plane formed by them, is :

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