L PreCal
posted by Norah .
A car is moving at a rate of 65 miles per housr and the diameter of it's wheels is 2.5ft. Find the number of revolutions per minute the wheels are rotating.
I have no idea where to begin on this question. How do you find rev per min?? Can someone walk me step by step how to answer a problem this?

First convert miles per hour to feet per second.
65 mph = 95.3 ft/s
The rotation rate of the wheels in radians per second, w, is
w = (speed)/(radius) = (95.3 ft/s)/(1.25 ft)
= 76.3 radians/s
Convert that to rpm by multiplying by
(60 s/min)*[1/(2 pi)] rev/rad)
729 rpm
Respond to this Question
Similar Questions

Honors PreCalculus
It is known that when a car with wheels of radius 14 in. is driven at 35 mph, the wheels turn at an approximate rate of 420 revoulutions for minute. Show how to obtain this rate of turn. If you ride a bicycle a distance of 5 miles … 
Precalc
A car is moving at the rate of 60 miles per hour, and the diameter of its wheels is 2.5 feet (1 mile=5280 feet) a) Find the angular speed of the wheels in radians per minute b) Find the number of revolutions per minute the wheels are … 
Trignometry
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. 
trigonometry
A truck with 48in.diameter wheels is traveling at 55 mi/h. Find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes: __rad/min How many revolutions per minute do the wheels make? 
Math
A car is moving at a rate of 60 miles per hour. the diameter of the wheels are 2.6 ft. how do you find the revolutions per minute that the wheels are rotating? 
Math
A truck with 40in.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? 
precalc
The wheels of a car have a radius of 11 inches and are rotating at 600 revolutions per minute, find the speed of car in mileage per hour. 
Math
A truck with 36in.diameter wheels is traveling at 55 mi/h. Find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes How many revolutions per minute do the wheels make? 
Trigonometry
a bicycle with 24inch diameter wheels is traveling at 15mi/hr. a) Find the angular speed of the wheels in rad/min. b)How many revolutions per minute do the wheels make? 
algebra
A car is moving at the rate of 80km/h. the diameter of its wheel is 60cm. a, find the number of revolutions per minute that the wheels are rotating. b, find the angular speed of the wheels in radians per second.