A lawnmower blade has a diameter of 30 inches. If the blade rotates at a speed of 126 revolutions per minute, find the linear speed of the tips of the blade in feet per second.

Answer :

The relationship between linear speed and angular speed is given by:

[tex]\begin{gathered} \omega=\frac{v}{r} \\ where\colon \\ \omega=Angular_{\text{ }}sped \\ v=Linear_{\text{ }}speed \\ r=radius \end{gathered}[/tex]

so:

[tex]\begin{gathered} r=30in=0.762m \\ \omega=126rpm \\ so\colon \\ v=\omega\cdot r \\ v=126\cdot0.762 \\ v\approx\frac{10.1m}{s} \end{gathered}[/tex]

therefore:

[tex]v\approx\frac{33.14ft}{s}[/tex]

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