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Math Help - Did I answer this correctly? Trig rotation question

  1. #1
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    Smile Did I answer this correctly? Trig rotation question

    A car is traveling at 50 mph. Find the revolutions per minute of the wheels if the car tires have a 26 inch diameter.

    50 mph , 13 inch radius
    50 mph(5280ft in a mile)/60 min an hour = 4400 ft/min
    total distance in 1 minute ---------------^

    13 inches/12 inches in a foot * 2pi = 13pi/6 <--- 1 revolution

    4400 ft/min / 13pi/6 = 646.41 rev per min

    646.41 revolutions per minute? Did I do that right? Thank you for your help in advance.
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  2. #2
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    Hello dpjwilson
    Quote Originally Posted by dpjwilson View Post
    A car is traveling at 50 mph. Find the revolutions per minute of the wheels if the car tires have a 26 inch diameter.

    50 mph , 13 inch radius
    50 mph(5280ft in a mile)/60 min an hour = 4400 ft/min
    total distance in 1 minute ---------------^

    13 inches/12 inches in a foot * 2pi = 13pi/6 <--- 1 revolution

    4400 ft/min / 13pi/6 = 646.41 rev per min

    646.41 revolutions per minute? Did I do that right? Thank you for your help in advance.
    Looks good to me!

    Grandad
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