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A disc of mass M and radius R rolls without slipping on a horizontal surface (see figure).

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If the speed of its centre is v0, then the magnitude of the angular momentum of the disc about a fixed point P at a height 5R/2 above the horizontal surface

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Important Questions on Systems of Particles and Rotational Motion

HARD
A uniform thin rod of length 2L and mass m lies on a horizontal table. A horizontal impulse J is given to the rod at one end. There is no friction. The total kinetic energy of the rod just after the impulse will be
HARD
A sphere and a hollow cylinder without slipping, roll down two separate inclined planes A and B respectively. They cover same distance in a given duration. If the angle of inclination of plane A is 30°, then and the angle of inclination of plane B must be (approximately).
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A flat surface of a thin uniform disk A of radius R is glued to a horizontal table. Another thin uniform disk B of mass M and with the same radius R rolls without slipping on the circumference of A, as shown in the figure. A flat surface of B also lies on the plane of the table. The center of mass of B has fixed angular speed ω about the vertical axis passing through the center of A. The angular momentum of B is nMωR2 with respect to the center of A. Which of the following is the value of n?

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A cylinder of mass 2 kg is released from rest from the top of an inclined plane of inclination 30° and length 1 m. If the cylinder rolls without slipping, then its speed when it reaches the bottom is [g=10 m s-2]
HARD

A small roller of diameter 20 cm has an axle of diameter 10 cm (see figure below on the left). It is on a horizontal floor and a meter scale is positioned horizontally on its axle with one edge of the scale on top of the axle (see figure on the right). The scale is now pushed slowly on the axle so that it moves without slipping on the axle, and the roller starts rolling without slipping. After the roller has moved 50 cm, the position of the scale will look like (figures are schematic and not drawn to scale)

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MEDIUM

A solid cylinder of mass m and radius R rolls down inclined plane without slipping. The speed of its C.M. when it reaches the bottom is___

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EASY
In rotational motion of a rigid body, all particles move with _______.
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A small object of uniform density rolls up a curved surface with an initial velocity v. It reaches up to a maximum height of 3v24g with respect to the initial position. The object is 

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HARD
A uniform solid cylindrical roller of mass m is being pulled on a horizontal surface with force F parallel to the surface and applied at its centre. If the acceleration of the cylinder is a and it is rolling without slipping then the value of F is:
EASY
In a bicycle, the radius of rear wheel is twice the radius of front wheel. If rf and rr are the radius, vf and vr are the speeds of top most points of wheel, then
MEDIUM
A disc of mass M and radius R rolls without slipping on a level surface with a linear speed v. Its kinetic energy will be given by
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A roller is made by joining together two cones at their vertices O. It is kept on two rails AB and CD which are placed asymmetrically (see figure), with its axis perpendicular to CD and its centre O at the centre of line joining AB and CD (see figure). It is given a light push so that it starts rolling with its centre O moving parallel to CD in the direction shown. As it moves, the roller will tend to:


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EASY
A solid cylinder of mass M and radius R rolls down a smooth inclined plane about its own axis and reaches the bottom with velocity v. The height of the inclined plane is (g= acceleration due to gravity)
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A solid sphere and solid cylinder of identical radii approach an incline with the same linear velocity (see figure). Both roll without slipping all throughout. The two climb maximum heights hsph and hcyl on the incline. The ratio hsphhcyl  is given by:
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EASY
A cord is wound round the circumference of wheel of radius r, The axis of the wheel is horizontal and the moment of inertia about it is I. A weight mg is attached to the cord at the end. The weight falls from rest. After falling through a distance h, the square of angular velocity of wheel will be
HARD
The velocity of a solid sphere on reaching the bottom of an inclined plane is v when it rolls down and v' when it slides down. The value of vv' will be,
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A solid cylinder of mass m and radius r rolls without slipping down an inclined plane of length l and height h. The speed of its centre of mass when the cylinder reaches the bottom is,
HARD

A sphere of radius a and mass m rolls along a horizontal plane with constant speed v0. It encounters an inclined plane at angle θ and climbs upward. Assuming that it rolls without slipping, how far up the sphere will travel?

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MEDIUM
A uniform sphere of mass 500 g rolls without slipping on a plane horizontal surface with its centre moving at a speed of 5.00 cm s-1. Its kinetic energy is:
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Consider a cylinder of mass M resting on a rough horizontal rug that is pulled out from under it with acceleration 'a' perpendicular to the axis of the cylinder. What is Ffriction at point P ? It is assumed that the cylinder does not slip.
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