Answer: 7.5 rev/s
Explanation:
We are given the angular velocity [tex]\omega[/tex] a helicopter's main rotor blades:
[tex]\omega=450 rpm=450 \frac{rev}{min}[/tex]
However, we are asked to express this [tex]\omega[/tex] in the International Systrm (SI) units. In this sense, the SI unit for time is second ([tex]s[/tex]):
[tex]\omega=450 \frac{rev}{min} \frac{1 min}{60 s}[/tex]
[tex]\omega=7.5 \frac{rev}{s}[/tex]
