Class XI A mass is revolving in a circle, which is in the plane of paper. The direction of angular acceleration if any, is towards the radius upward from the plane of paper At right angles to the plane of paper. Tangential the centre of mass of a system of particles moves as if all the mass of the system was concentrated at the centre of mass and all the external forces were applied at that point as if all the mass of the system was concentrated in a sphere around the centre of mass and all the external forces were zero as if all the mass of the system was concentrated in a sphere around the centre of mass and all the external forces were zero as if all the mass of the system was concentrated at the centre of mass and all the external forces were zero The angular velocity of a body changes form 1 rev / sec to 25 rev/sec. without applying any external torque. The ratio of the radii of gyration in the two cases is it is 1: 25 it is 1: 5 it is 25:1 it is 5:1 The vector product of two vectors a and b is a vector c such that the magnitude of c is given by |a||b||a||b|tanθ |a||b||a||b|cosθ |a||b||a||b|sinθ |a||b||a||b|cosθ In an orbital motion, the angular momentum vector is parallel to the linear momentum in the orbital plane along the radius vector perpendicular to the orbital plane Do you really want to submit this quiz? Cancel Submit Quiz