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The radius of a car wheel is 15 inches. How many revolutions per minute is the wheel making when the car is traveling at 60 mph?

AdamTaurus  Jan 30, 2018

Best Answer 

 #1
avatar+11278 
+2

60 m/hr  x  5280 feet/m  x  12 in/ft  x  1 hr/60min =  63360 in/min

 

Circumference = pi x 2r = pi x 30 = 94.2477 inches/circumf

 

63360 in /min  x  1 circumf/94.2477 inches = 672.27 circumf/min = rpm

ElectricPavlov  Jan 30, 2018
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3+0 Answers

 #1
avatar+11278 
+2
Best Answer

60 m/hr  x  5280 feet/m  x  12 in/ft  x  1 hr/60min =  63360 in/min

 

Circumference = pi x 2r = pi x 30 = 94.2477 inches/circumf

 

63360 in /min  x  1 circumf/94.2477 inches = 672.27 circumf/min = rpm

ElectricPavlov  Jan 30, 2018
 #2
avatar+733 
+2

Okay. I got the right answer. Thanks!

AdamTaurus  Jan 30, 2018
 #3
avatar+11278 
+2

Great!  If we BOTH got the same answer, it is likely I got the right answer too!     Thanx    !

ElectricPavlov  Jan 30, 2018

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