A person sitting firmly over a rotating stool has his arms stretched. If he folds his arms, his angular momentum about the axis of rotation

No No Yes No No Yes Angular momentum and total energy at all points of the orbit of a comet moving in a highly elliptical orbit around the Sun are constant. Its linear speed, angular speed,...

(d) : Central forces passes through axis of rotation so torque is zero. If no external torque is acting on a particle, the angular momentum of a particle is constant.

(c) 0. Explanation:  The directions of A and B will be perpendicular to each other. Hence A.B = |A|.|B|.Cos90° =0.

(c) 0 Explanation:  Since the body is uniformly rotating, the resultant force on the particle P will be in the radial direction. So again the directions of A and B will be...

The correct answer is (b) Explanation:  Moment of inertia of the ring I = Mr²  Angular Momentum = I⍵  When the masses are attached, the moment of Inertia I'= Mr²+2mr²  =(M+2m)r²  Let the new angular speed...

(b) may pass through the centre of mass (d) may pass through a particle of the body. Explanation:  It is not a necessary condition that the axis of rotation should pass through the center of...

A disc of radius = 10 cm = 0.1 m Angular velocity = 20 rad/s Linear velocity on the rim = ωr = 20 × 0.1 = 2 m/s Linear velocity at the...

(b) may pass through the centre of mass (d) may pass through a particle of the body. Explanation:  It is not a necessary condition that the axis of rotation should pass through the...

(a) Task 1 can not be assigned to either person 1 or 2 i.e. there are 4 options. Task 2 can be assigned to 3 or 4 So, there are only 2 options...

(a) Refer to last sentence of the passage. The two little boys feared the barwing dogs.