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When new, a standard tire has 10/32 inches of tread. When only 2/32 inches of tread remains, the tire needs to be replaced. If this occurs after 40,000 miles, what thickness of tire rubber is lost...

it takes a star, with 24 times the mass of the sun, 3 years to orbit a black hole. if the average distance between the star and the center of the black hole is 9 AU, then the mass contained inside...

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