The diameter of the wheel of a bicycle is 0.6m . Mary is riding this bicycle at a speed of 4km/h. How many revolutions do the wheels make in every minute?
Give the ans correct to the nearest integer.
一題數~~
2007-05-05 12:51 am
回答 (1)
2007-05-05 12:57 am
✔ 最佳答案
The distance that Mary rides in one minute= ( 4 x 1000 ) x 1 / 60
= 4000 / 60
= 400 / 6
= 66 ( 2 / 3 ) m
The circumference of the wheel
= 0.6 π m
So the number of revolutions the wheels make in every minute
= 66 ( 2 / 3 ) / 0.6 π
= 35.367...
= 35 revolutions (corr. to the nearest integer)
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