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# Advanced Math/Trigonometry: Solving trig equations

Question
a car is moving at a rate of 65 miles per hour and the diameter of its wheel is 2.5 feet.
(a)find the number of revolutions per minute
(b)find the angular speed of the wheels in radians per minute

1 mile = 5280 feet
1 hour = 60 minutes

speed = 65 mi/h  × 5280 ft/mi × 1 h/(60 min) = 5720 ft/min
circumference of wheel = 2.5π ft

5720 ft/min × 1 rev/(2.5π ft) = 728.3 rev/min

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#### Janet Yang

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