Question

If a tire rotates at 400 revolutions per minute when the car is traveling 72km/h, what is the circumference of the tire?​

Answer 1

Answer:

20 revolutions of the tire make the car travel travel 60m. So a single revolution should take 3m. ( 60/20) Now the circumference of the tire is the distance travelled in a single revolution.

Step-by-step explanation:

To find the circumference, we will figure out revolutions per second of the tire and meters travelled per second by the car.

Revolutions per second = 400 / 60 = 6.67

For convenience revolutions for 3 seconds = 20

72 kmph = 20 m/s

i.e 72000 m / hr or 1200 / min

72000 / 3600

So for 3 seconds it should be 60m travelled.

So 20 revolutions of the tire make the car travel travel 60m. So a single revolution should take 3m. ( 60/20) Now the circumference of the tire is the distance travelled in a single revolution.

HOPE THIS HELPS YOU !

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