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When my car has wheels with a diameter of 24 inches, its speedometer reports the correct speed of my car. I recently replaced my 24-inch wheels with 28-inch diameter wheels. I didn’t change my speedometer, however. When the speedometer tells me that the car is going 40 miles per hour (and I’m driving with my 28-inch wheels), how fast is my car really going?

 Oct 19, 2021
 #1
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28/24   * 40 = _________ m/hr

 Oct 19, 2021
 #2
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The post above is not the correct solution for this question.

 

The circumference of the wheels is proportional to the square of the radius.

 

\(\dfrac {28^2}{24^2} * 40 =\)

 

 

 

GA

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 Oct 19, 2021
 #3
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The AREA if the circle is proprtional to the SQUARE of the RADIUS.   ( your equation uses diameter....also wrong)

The Circumference = pi * d   

    circumference is proportional to the diameter....   not diameter squared

Guest Oct 19, 2021
 #4
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You are right! I was very careless. Sorry. 

 

GA

--. .-

Guest Oct 20, 2021

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