PHYSICS · Multi-part · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
A playground turntable starts from rest, accelerates uniformly for 4s with an angular acceleration of 1.5rads−2, then rotates at the constant angular velocity reached for the next 3s, and finally decelerates uniformly to rest in 5s. Treat all motion as about the same fixed axis.
(i) Calculate the angular velocity attained at the end of the first 4s.
(ii) Compute the angular displacement during each of the three stages and hence find the total angular displacement for the entire motion.
(iii) Determine the average angular velocity for the whole interval of motion.
(iv) Find the instantaneous angular velocity 4s after the beginning of the deceleration phase.