Physics-
General
Easy

Question

A ball of mass m moving with constant velocity u collides with a smooth horizontal surface at O as shown. Neglect gravity and friction. The y-axis is drawn normal to the horizontal surface at the point of impact O and x-axis is horizontal as shown in the figure. About which point will the angular momentum of ball be conserved.

  1. point A    
  2. point B    
  3. point C    
  4. None of these    

The correct answer is: point B

Related Questions to study

General
physics-

A particle of mass m is moving at speed v perpendicular to a rod of length d and mass M = 6m which pivots around a frictionless axle running through its centre. It strikes and sticks to the end of the rod. The moment of inertia of the rod about its centre is M d to the power of 2 end exponent divided by 12. Then the angular speed of the system just after the collision is

A particle of mass m is moving at speed v perpendicular to a rod of length d and mass M = 6m which pivots around a frictionless axle running through its centre. It strikes and sticks to the end of the rod. The moment of inertia of the rod about its centre is M d to the power of 2 end exponent divided by 12. Then the angular speed of the system just after the collision is

physics-General
General
physics-

A uniform rod of length l is sliding such that one of its ends is always in contact with a vertical wall and its other end is always in contact with horizontal surface. Just after the rod is released from rest, the magnitude of acceleration of end points of the rod are a and b respectively. The angular acceleration of rod at this instant will be

A uniform rod of length l is sliding such that one of its ends is always in contact with a vertical wall and its other end is always in contact with horizontal surface. Just after the rod is released from rest, the magnitude of acceleration of end points of the rod are a and b respectively. The angular acceleration of rod at this instant will be

physics-General
General
physics-

A uniform rod of mass M and length L lies radially on a disc rotating with angular speed omega in a horizontal plane about its axis. The rod does not slip on the disc and the centre of the rod is at a distance R from the centre of the disc. Then the kinetic energy of the rod is :

A uniform rod of mass M and length L lies radially on a disc rotating with angular speed omega in a horizontal plane about its axis. The rod does not slip on the disc and the centre of the rod is at a distance R from the centre of the disc. Then the kinetic energy of the rod is :

physics-General
parallel
General
physics-

A uniform rod of mass m, length lambda is placed over a smooth horizontal surface along y-axis and is at rest as shown in figure. An impulsive force F is applied for a small time capital deltat along x-direction at point A. The x–coordinate of end A of the rod when the rod becomes parallel to x–axis for the first time is (initially the coordinate of centre of mass of the rod is (0, 0)):

A uniform rod of mass m, length lambda is placed over a smooth horizontal surface along y-axis and is at rest as shown in figure. An impulsive force F is applied for a small time capital deltat along x-direction at point A. The x–coordinate of end A of the rod when the rod becomes parallel to x–axis for the first time is (initially the coordinate of centre of mass of the rod is (0, 0)):

physics-General
General
physics-

A uniform equilateral prism of mass m rests on a rough horizontal surface with coefficient of friction mu. A horizontal force F is applied on the prism as shown in the figure. If the coefficient of friction is sufficiently high so that the prism does not slide before toppling, then the minimum force required to topple the prism is :

A uniform equilateral prism of mass m rests on a rough horizontal surface with coefficient of friction mu. A horizontal force F is applied on the prism as shown in the figure. If the coefficient of friction is sufficiently high so that the prism does not slide before toppling, then the minimum force required to topple the prism is :

physics-General
General
physics-

A small block of mass blank to the power of ´ end exponent m to the power of ´ end exponent is rigidly attached at ‘P’ to a ring of mass blank to the power of ´ end exponent 3 m to the power of ´ end exponentand radius text ´r´ end text. The system is released from rest at theta equals 90 to the power of ring operator end exponent and rolls without sliding. The angular acceleration of hoop just after release is –

A small block of mass blank to the power of ´ end exponent m to the power of ´ end exponent is rigidly attached at ‘P’ to a ring of mass blank to the power of ´ end exponent 3 m to the power of ´ end exponentand radius text ´r´ end text. The system is released from rest at theta equals 90 to the power of ring operator end exponent and rolls without sliding. The angular acceleration of hoop just after release is –

physics-General
parallel
General
physics-

A uniform disc is performing pure rolling on a smooth stationary surface with constant angular velocity as shown in figure. At any instant, for the lowermost point of the disc

A uniform disc is performing pure rolling on a smooth stationary surface with constant angular velocity as shown in figure. At any instant, for the lowermost point of the disc

physics-General
General
physics-

A square plate of edge a/2 is cut out from a uniform square plate of edge 'a' as shown in figure. The mass of the remaining portion is M. The moment of inertia of the shaded portion about an axis passing through 'O' (centre of the square of side a) and perpendicular to plane of the plate is :

A square plate of edge a/2 is cut out from a uniform square plate of edge 'a' as shown in figure. The mass of the remaining portion is M. The moment of inertia of the shaded portion about an axis passing through 'O' (centre of the square of side a) and perpendicular to plane of the plate is :

physics-General
General
physics-

A planar object made up of a uniform square plate and four semicircular discs of the same thickness and material is being acted upon by four forces of equal magnitude as shown in figure. The coordinates of point of application of forces is given by

A planar object made up of a uniform square plate and four semicircular discs of the same thickness and material is being acted upon by four forces of equal magnitude as shown in figure. The coordinates of point of application of forces is given by

physics-General
parallel
General
physics-

In the figure shown a ball rolls without sliding. On a horizontal surface. It ascends a curved track up to height h and returns. Value of h is h subscript 1 end subscript for sufficiently rough curved track to avoid sliding and h subscript 1 end subscript for smooth curved track, then:

In the figure shown a ball rolls without sliding. On a horizontal surface. It ascends a curved track up to height h and returns. Value of h is h subscript 1 end subscript for sufficiently rough curved track to avoid sliding and h subscript 1 end subscript for smooth curved track, then:

physics-General
General
physics-

A smooth tube of certain mass is rotated in gravity free space and released. The two balls shown in the figure move towards ends of the tube. For the whole system which of the following quantity is not conserved?

A smooth tube of certain mass is rotated in gravity free space and released. The two balls shown in the figure move towards ends of the tube. For the whole system which of the following quantity is not conserved?

physics-General
General
physics-

In the pulley system shown, if radii of the bigger and smaller pulley are 2 m and 1m respectively and the acceleration of block A is 5 m divided by s to the power of 2 end exponent in the downward direction, then the acceleration of block B will be:

In the pulley system shown, if radii of the bigger and smaller pulley are 2 m and 1m respectively and the acceleration of block A is 5 m divided by s to the power of 2 end exponent in the downward direction, then the acceleration of block B will be:

physics-General
parallel
General
physics-

A uniform thin rod of length 4 l, mass 4m is bent at the points as shown in the figure. What is the moment of inertia of the rod about the axis passing through point O & perpendicular to the plane of the paper?

A uniform thin rod of length 4 l, mass 4m is bent at the points as shown in the figure. What is the moment of inertia of the rod about the axis passing through point O & perpendicular to the plane of the paper?

physics-General
General
physics-

A uniform thin cylindrical disk of mass M and radius R is attached to two identical massless springs of spring constant k which are fixed to the wall as shown in the figure. The springs are attached to the axle of the disk symmetrically on either side at a distance d from its centre. The axle is mass less and both the springs and the axle are in a horizontal plane. The unstretched length of each spring is L. The disk is initially at its equilibrium position with its centre of mass (CM) at a distance L from the wall. The disk rolls without slipping with velocity stack v with rightwards arrow on top subscript 0 end subscript equals stack V with rightwards arrow on top subscript 0 end subscript stack i with tilde on top. The coefficient of friction is mu .The maximum value of v0 for which the disk will roll without slipping is

A uniform thin cylindrical disk of mass M and radius R is attached to two identical massless springs of spring constant k which are fixed to the wall as shown in the figure. The springs are attached to the axle of the disk symmetrically on either side at a distance d from its centre. The axle is mass less and both the springs and the axle are in a horizontal plane. The unstretched length of each spring is L. The disk is initially at its equilibrium position with its centre of mass (CM) at a distance L from the wall. The disk rolls without slipping with velocity stack v with rightwards arrow on top subscript 0 end subscript equals stack V with rightwards arrow on top subscript 0 end subscript stack i with tilde on top. The coefficient of friction is mu .The maximum value of v0 for which the disk will roll without slipping is

physics-General
General
physics-

A uniform thin cylindrical disk of mass M and radius R is attached to two identical massless springs of spring constant k which are fixed to the wall as shown in the figure. The springs are attached to the axle of the disk symmetrically on either side at a distance d from its centre. The axle is mass less and both the springs and the axle are in a horizontal plane. The unstretched length of each spring is L. The disk is initially at its equilibrium position with its centre of mass (CM) at a distance L from the wall. The disk rolls without slipping with velocity stack v with rightwards arrow on top subscript 0 end subscript equals stack V with rightwards arrow on top subscript 0 end subscript stack i with tilde on top. The coefficient of friction is mu. The centre of mass of the disk undergoes simple harmonic motion with angular frequency omega equal to

A uniform thin cylindrical disk of mass M and radius R is attached to two identical massless springs of spring constant k which are fixed to the wall as shown in the figure. The springs are attached to the axle of the disk symmetrically on either side at a distance d from its centre. The axle is mass less and both the springs and the axle are in a horizontal plane. The unstretched length of each spring is L. The disk is initially at its equilibrium position with its centre of mass (CM) at a distance L from the wall. The disk rolls without slipping with velocity stack v with rightwards arrow on top subscript 0 end subscript equals stack V with rightwards arrow on top subscript 0 end subscript stack i with tilde on top. The coefficient of friction is mu. The centre of mass of the disk undergoes simple harmonic motion with angular frequency omega equal to

physics-General
parallel

card img

With Turito Academy.

card img

With Turito Foundation.

card img

Get an Expert Advice From Turito.

Turito Academy

card img

With Turito Academy.

Test Prep

card img

With Turito Foundation.