Physics-
General
Easy
Question
A circular platform is mounted on a vertical frictionless axle. Its radius is r = 2m and its moment of inertia is I = 200 kg - m2. It is initially at rest. A 70 kg man stands on the edge of the platform and begins to walk along the edge at speed v0 = 1.0 m/s relative to the ground. The angular velocity of the platform is -
- 1.2 rad/s
- 0.4 rad/s
- 2.0 rad/s
- 0.7 rad/s
The correct answer is: 0.7 rad/s
Related Questions to study
Physics-
A particle of mass 1 kg is moving along the line y = x + 2 (here x and y are in metres) with speed 2 m/s. The magnitude of angular momentum of particle about origin is -
A particle of mass 1 kg is moving along the line y = x + 2 (here x and y are in metres) with speed 2 m/s. The magnitude of angular momentum of particle about origin is -
Physics-General
Physics-
A disc is rotating with an angular velocity 0. A constant retarding torque is applied on it to stop the disc. The angular velocity becomes 
after n rotations. How many more rotations will it make before coming to rest ?
A disc is rotating with an angular velocity 0. A constant retarding torque is applied on it to stop the disc. The angular velocity becomes after n rotations. How many more rotations will it make before coming to rest ?
Physics-General
Physics-
Two rings of same radius (r) and mass (m) are placed such that their centres are at a common point and their planes are perpendicular to each other. The moment of inertia of the system about an axis passing through the centre and perpendicular to plane of one of the ring is -
Two rings of same radius (r) and mass (m) are placed such that their centres are at a common point and their planes are perpendicular to each other. The moment of inertia of the system about an axis passing through the centre and perpendicular to plane of one of the ring is -
Physics-General
Physics-
Four particles of mass m1 = 2m, m2 = 4m, m3 = m and m4 are placed at four corners of a square. What should be the value of m4 so that the centre of mass of all the four particles are exactly at the centre of the square ?
Four particles of mass m1 = 2m, m2 = 4m, m3 = m and m4 are placed at four corners of a square. What should be the value of m4 so that the centre of mass of all the four particles are exactly at the centre of the square ?
Physics-General
Physics-General
Physics-
A ring of mass 100 kg and diameter 2m is rotating at the rate of 
rpm. Then-
A ring of mass 100 kg and diameter 2m is rotating at the rate of rpm. Then-
Physics-General
Physics-
For particle of a purely rotating body, v = r, so correct relation will be -
For particle of a purely rotating body, v = r, so correct relation will be -
Physics-General
Physics-
In the figure given below, the end B of the rod AB which makes angle with the floor is pulled with a constant velocity v0 as shown. The length of rod is . At an instant when = 37º
In the figure given below, the end B of the rod AB which makes angle with the floor is pulled with a constant velocity v0 as shown. The length of rod is . At an instant when = 37º
Physics-General
Physics-General
Physics-
Portion AB of the wedge shown in figure is rough and BC is smooth. A solid cylinder rolls without slipping from A to B. If AB = BC, then ratio of translational kinetic energy to rotational kinetic energy, when the cylinder reaches point C is – 
Portion AB of the wedge shown in figure is rough and BC is smooth. A solid cylinder rolls without slipping from A to B. If AB = BC, then ratio of translational kinetic energy to rotational kinetic energy, when the cylinder reaches point C is – Physics-General
Physics-General
Physics-
The speed of wave traveling on the uniform circular ring, which is rotating about an axis passing through its center and perpendicular to its plane with tangential speed v in gravity free space is -
The speed of wave traveling on the uniform circular ring, which is rotating about an axis passing through its center and perpendicular to its plane with tangential speed v in gravity free space is -
Physics-General
Physics-
At any instant, a rolling body may be considered to be in pure rotation about an axis through the point of contact but this axis is translating forward with a speed -
At any instant, a rolling body may be considered to be in pure rotation about an axis through the point of contact but this axis is translating forward with a speed -
Physics-General
Physics-
A L shaped rod whose one rod is horizontal and other is vertical is rotating about a vertical axis as shown with angular speed . The sleeve shown in figure has mass m and friction coefficient between rod and sleeve is . The minimum angular speed for which sleeve cannot sleep on rod is –
A L shaped rod whose one rod is horizontal and other is vertical is rotating about a vertical axis as shown with angular speed . The sleeve shown in figure has mass m and friction coefficient between rod and sleeve is . The minimum angular speed for which sleeve cannot sleep on rod is –
Physics-General
Physics-General
Physics-
Figure shows a smooth inclined plane of inclination fixed in a car. A sphere is set in pure rolling on the incline. For what value of 'a' (the acceleration of car in horizontal direction) the sphere will continue pure rolling ?
Figure shows a smooth inclined plane of inclination fixed in a car. A sphere is set in pure rolling on the incline. For what value of 'a' (the acceleration of car in horizontal direction) the sphere will continue pure rolling ?
Physics-General
Physics-General
Physics-
A disc is performing pure rolling on a smooth stationary surface with constant angular velocity as shown in figure. At any instant, for the lower most point of the disc.
A disc is performing pure rolling on a smooth stationary surface with constant angular velocity as shown in figure. At any instant, for the lower most point of the disc.
Physics-General
Physics-General
Physics-
When a wheel of radius R moves a distance smaller than 2R making one rotation then -
When a wheel of radius R moves a distance smaller than 2R making one rotation then -
Physics-General
Physics-
A body of radius R and mass m is rolling horizontally without slipping with speed v. It then rolls up a hill to a maximum height h = 
. The body might be a -
A body of radius R and mass m is rolling horizontally without slipping with speed v. It then rolls up a hill to a maximum height h = . The body might be a -
Physics-General
