Question

Calculate the velocity of the disc if the angular speed is 5 rad/s and radius is 2 m.

(a) 25 m/s

(b) 20 m/s

(c) 25 m/s

(d) 10 m/s

I had been asked this question in a national level competition.

This interesting question is from Starting in section Starting of Electric Drives

Answer 1

Right choice is (d) 10 m/s

Explanation: The velocity of the disc can be calculated using the relation V=ω×r. The velocity is the vector product of angular speed and radius. V = ω×r = 5×2 = 10 m/s.