Physics-
General
Easy
Question
A uniform disc rotates freely about a perpendicular axis making 
revolutions per minute. wax of mass m falls vertically and sticks to the disc at distance x from the axis Rotational speed reduced to 
, then moment of inertia of the disc is
The correct answer is:
Related Questions to study
physics-
Two similar beads each of mass m slide smoothly along a uniform rod mass M and length l. the rod can rotate along an axis passing through its centre and normal to its length. Initially the rod is rotated with angular speed 
when beads are at the centre C of the rod. The angular speed 
of the rod when beads slide to the two ends of the rod without any external force is given by
Two similar beads each of mass m slide smoothly along a uniform rod mass M and length l. the rod can rotate along an axis passing through its centre and normal to its length. Initially the rod is rotated with angular speed when beads are at the centre C of the rod. The angular speed of the rod when beads slide to the two ends of the rod without any external force is given by
physics-General
Physics-
A circular turn table circulates about its normal axis with uniform angular speed 
. A circular thick of layer of ice and of radius much smaller than the table - top rotates along with the table. The new angular speed 
of the table when ice starts melting is
A circular turn table circulates about its normal axis with uniform angular speed . A circular thick of layer of ice and of radius much smaller than the table - top rotates along with the table. The new angular speed of the table when ice starts melting is
Physics-General
Physics-
A man stands at the centre of a turn table, his arms extended horizontally, with a 5 kg mass in each hand. He is set into rotation with an angular velocity of one revolution in 2 s. His new angular velocity if he drops his hands to his sides is (Assume the moment of inertia of the man is 
. The initial distance of the weights from the axis is 1 m and their final distance is 0.2 m )
A man stands at the centre of a turn table, his arms extended horizontally, with a 5 kg mass in each hand. He is set into rotation with an angular velocity of one revolution in 2 s. His new angular velocity if he drops his hands to his sides is (Assume the moment of inertia of the man is . The initial distance of the weights from the axis is 1 m and their final distance is 0.2 m )
Physics-General
maths-
Find the area of the shaded region from the adjacent figure
Find the area of the shaded region from the adjacent figure
maths-General
Maths-
The area of shaded region from the adjacent figure is
The area of shaded region from the adjacent figure is
Maths-General
Maths-
The area of shaded region from the adjacent figure is
The area of shaded region from the adjacent figure is
Maths-General
physics-
When a force F is applied on a block of mass m resting on a horizontal surface then there are two possibilities, either the block moves by translation or it moves by toppling. If the surface is smooth then the block always translates but on a rough surface it topples only when the torque of the applied force F is greater than the torque of mg about a point in contact with the ground. When the force F is applied the body
When the block topples about A, the normal force:
When a force F is applied on a block of mass m resting on a horizontal surface then there are two possibilities, either the block moves by translation or it moves by toppling. If the surface is smooth then the block always translates but on a rough surface it topples only when the torque of the applied force F is greater than the torque of mg about a point in contact with the ground. When the force F is applied the body
When the block topples about A, the normal force:
physics-General
physics-
In the figure shown, the masses of blocks A and B have mass 
and 
respectively. Pulley having moment of inertia, 
can rotate without friction about a fixed axis. The inner and outer radii of the pulley are a=10 cm, and b=15 cm. respectively. B is hanging with the thread wrapped around the pulley. While a lies on a rough inclined plane. Coefficient of friction being 
The tensions in the threads are
In the figure shown, the masses of blocks A and B have mass and respectively. Pulley having moment of inertia, can rotate without friction about a fixed axis. The inner and outer radii of the pulley are a=10 cm, and b=15 cm. respectively. B is hanging with the thread wrapped around the pulley. While a lies on a rough inclined plane. Coefficient of friction being The tensions in the threads are
physics-General
physics-
An uniform block of mass M, height h and base width a is kept on a rough inclined plane as shown in figure. Friction is enough to prevent any slipping between inclined plane and block. The angle of inclined plane is then increased. Determine the limiting value of 
so that the block does not tip over ?
An uniform block of mass M, height h and base width a is kept on a rough inclined plane as shown in figure. Friction is enough to prevent any slipping between inclined plane and block. The angle of inclined plane is then increased. Determine the limiting value of so that the block does not tip over ?
physics-General
physics-
A uniform disc of radius R, specific gravity 3 and mass ' M ' is immersed in water and fixed at the top point 'p' on its rim as shown in the fig. If can rotate in the plane of the fig about the axis passing through ' P ' If the disc is displaced by a small angle from the vertical position what is net torque that acts on the disc about point P.
A uniform disc of radius R, specific gravity 3 and mass ' M ' is immersed in water and fixed at the top point 'p' on its rim as shown in the fig. If can rotate in the plane of the fig about the axis passing through ' P ' If the disc is displaced by a small angle from the vertical position what is net torque that acts on the disc about point P.
physics-General
physics-
A uniform rod of length 2l and mass m is placed on fixed sphere and the rod is held horizontal. The rod is released from rest with one fourth of length on one side of sphere. The normal reaction of sphere on the rod as soon as rod is released is
A uniform rod of length 2l and mass m is placed on fixed sphere and the rod is held horizontal. The rod is released from rest with one fourth of length on one side of sphere. The normal reaction of sphere on the rod as soon as rod is released is
physics-General
physics-
A uniform rod of length 1 is pivoted at point A. It is struck by a horizontal force which delivers an impulse J at a distance x from point A as shown in fig, impulse delivered by pivot is zero if x is equal to
A uniform rod of length 1 is pivoted at point A. It is struck by a horizontal force which delivers an impulse J at a distance x from point A as shown in fig, impulse delivered by pivot is zero if x is equal to
physics-General
physics-
A rod AB of length 1 m is placed at the edge of a smooth table as shown in fig. It is hit horizontally at point B. If the displacement of centre of mass in 1 s is 
. The angular velocity of the rod is 
A rod AB of length 1 m is placed at the edge of a smooth table as shown in fig. It is hit horizontally at point B. If the displacement of centre of mass in 1 s is . The angular velocity of the rod is
physics-General
physics-
A small block of mass ' m ' is rigidly attached at ' P ' to a ring of mass ' 3 m ' and radius ' r '. The system is released from rest at 
and rolls without sliding. The angular acceleration of hoop just after releases is -
A small block of mass ' m ' is rigidly attached at ' P ' to a ring of mass ' 3 m ' and radius ' r '. The system is released from rest at and rolls without sliding. The angular acceleration of hoop just after releases is -
physics-General
physics-
A smooth horizontal tube of length l rotates about a vertical axis as shown. A particle placed at the extreme end of the tube is projected towards 0 with a velocity 
, while at the same time the tube rotates about the axis with constant angular speed . The path of the particle is given by
A smooth horizontal tube of length l rotates about a vertical axis as shown. A particle placed at the extreme end of the tube is projected towards 0 with a velocity , while at the same time the tube rotates about the axis with constant angular speed . The path of the particle is given by
physics-General
