Question

If the shaft of a flywheel has an angular speed of $120\pi rad/s$, then the number of revolutions made by the flywheel per minute is:

• A. 1200
• B. 2000
• C. 1500
• D. 3600

Answer 1

The correct option is D 3600

$\omega =120\pi \frac{rad}{s}itmeans1s\to 120\pi rad\therefore in△min=60s=60\times 120\pi rad=\frac{60\times 120\pi }{2\pi }rotation=3600rotation$