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Question Description
A TIRE FOR A COMPACT CAR IS 21 INCHES IN DIAMETER. IF THE CAR IS TRAVELING AT A SPEED OF 80MI/HR, FIND THE NUMBEROF REVOLUTIONS THE TIRE MAKES PER MINUTE
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Explanation & Answer
Circumference =Πd
=22/7*21
=66 inches
Speed is 80 miles per hour
In 1 minute the wheel covers
80miles/60 minutes
=1.3333miles per minute
Since 1 mile =63630 inches,
1.3333 miles= 1.3333miles*63360inches
=84480 inches
Revolutions per minute=84480/66
=1280 revolutions
Qvpxraf V
(421)
Purdue University
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