# Math

A truck with 40-in.-diameter wheels is traveling at 50 mi/h.
a) Find the angular speed of the wheels in rad/min
b) How many revolutions per minute do the wheels make?

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1. 40 in wheel has circumference 40pi inches

50 mi/hr = 52800 in/min

so, that's 52800/40pi rev/min

or, 52800/40pi * 2pi = 52800/20 = 2640 rad/min

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