Try this problem, useful for Physics Olympiad, based on the propeller's angular velocity.
The Problem:
An airplane propeller is rotating at (1900)rpm (rev/min).
(a)Compute the propeller's angular velocity in rad/s.
(b) How many seconds does it take for the propeller to run through (35^\circ)?
Solution:
An airplane propeller is rotating at (1900)rpm (rev/min).
(1)rpm = (2\pi /60)$$ \omega=(1900)(2\pi /60)=199 $$Hence, the propeller's angular velocity (\omega)=(199)rad/s.
b) (35^\circ)(\pi/180^\circ)=(0.611)rad.
Since angular velocity (\omega)=199rad/s, the time required for the propeller to run through (35^\circ)=$$ \frac{0.611}{199}=3.1\times10^{-3}s$$
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