Question

Calculate the velocity of the satellite if the angular speed is 87 rad/s and radius is 7.4 m.

(a) 643.8 m/s

(b) 642.4 m/s

(c) 641.9 m/s

(d) 643.2 m/s

I had been asked this question during an internship interview.

The origin of the question is Speed Control of Series Motor topic in section Speed Control of Direct Current Motors & Induction Motors of Electric Drives

Answer 1

The correct answer is (a) 643.8 m/s

For explanation I would say: The velocity of the satellite can be calculated using the relation V=Ω×r. The velocity is the vector product of angular speed and radius. V=Ω×r = 87×7.4 = 643.8 m/s.