# physics

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An automobile tire is rated to last for 45,000 miles. Estimate the number of revolutions the tire will make in its lifetime.

• physics -

Dia. = 20in.

1rev = 3.14 * 20 = 62.8in = 5.2ft.

45000mi * 5280ft/mi * (1/5.2)rev/ft =
45,692,308.rev.

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