यदि एक पतली वृत्ताकार वलय (ring) की उसके केंद्र से गुजरने वाली और उसके तल के लंबवत अक्ष के परितः घूर्णन त्रिज्या (radius of gyration) 10√2 cm है, तो उसके व्यास के परितः उसकी घूर्णन त्रिज्या क्या होगी?

The angular speed of a flywheel is increased from 600 rpm to 1200 rpm in 10 s. The number of revolutions completed by the flywheel during this time is:

If F = 6î - 3ȷ + 2k̂ is a force acting on a point P whose position vector with respect to origin is r = 2î + ȷ - k̂, then the torque τ acting on the point is: