Asked by David

A car is moving at a rate of 55 mph and the diameter of its wheels is 2 feet.

A) Find the number of revolutions per minute the wheels are rotating.

B) Find the angular speed of the wheels in radians per minutes.

Answers

Answered by Reiny
so the radius is 1 ft
and the circumference is 2π

55 mph = 55(5280)/60 ft/min
= 4840 ft/min

so rotations per min = 4840/2π
= 770.31
since 1 rotation is 2π radians
angular speed = 4840/(2π) * 2π = 4840 radians/min
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