Question

A flywheel rotates at a constant speed of 3000 rpm. The angle described by the shaft in radian in one second is

• A. 2 π
• B. 30 π
• C. 100 π
• D. 3000 π

Answer 1

Answer: (C)

100 π

Answer 2

Angular speed $= 3000rpm = 50rps$ $= 50 \times 2\pi rad/\sec = 100\pi rad/\sec$

i.e. angle described by the shaft in one second is $100\pi$rad.