An object of mass 0.40 kg attached to the end of a string is whirled around in a horizontal circle of radius 2.0m with a constant speed of 8ms−¹. Calculate the angular velocity of the object

A. 0.8rads−¹
B. 2 rads−¹
C. 4 rads−¹
D. 8 rads−¹
E. 16 rads−¹

Correct Answer:

Option C – 4 rads−¹

Explanation

V=rw, 8=2w, w=8/2= 4rad/s−¹