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Drag-race tires in contact with an asphalt surface have a very high coefficient of static fric.tion. Assuming a constant acceleration and no slipping of tires, estimate the coefficient of static friction needed for a drag racer to cover 2.1 km in 8 s, starting from rest.

Coefficient of static friction =

  • physics -

    d = (1/2) a t^2
    solve for a
    F = m a = mu m g
    so
    mu = a/g

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