Systems of Part...

Four point masses P, Q, R and S with respective masses 1 kg, 1 kg, 2 kg and 2 kg from the corners of a square of side a. The centre of mass of the system will be farthest from

A particle moves along a circle of radius 20/π m with constant tangential acceleration. If the velocity of the particle is 80 m/s at the end of the second revolution after motion has begin, the tangential acceleration is

In rotational motion of a rigid body, all particles move with

A constant torque of 1000N-m turns a wheel of moment of inertia 200 kg-m² about an axis through its centre. Its angular velocity after 3 sec is

A car is moving at a speed of 72 km/hr. The radius of its wheels is 0.25 m. If the wheels are stopped in 20 rotations by applying brakes, then angular retardation produced by the brakes is

A wheel is rotating at 900 r.p.m. about its axis. When the power is cut-off, it comes to rest in 1 minute. The angular retardation in radian/s² is

In which case application of angular velocity is useful

A wheel rotates with a constant acceleration of 2.0 radian/sec². If the wheel starts from rest the number of revolutions it makes in the first ten seconds will be approximately

A mass is revolving in a circle which is in the plane of paper. The direction of angular acceleration is

The direction of the angular velocity vector is along