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28 February, 10:22

A student drives her car at 54.0 km/h along a level (horizontal) curve. The combined mass of the car is 1250 kg. If the

curve has a radius of 70.0 m, what centripetal force must be supplied by friction to keep the car from skidding?

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  1. 28 February, 12:23
    0
    4020 N

    Explanation:

    First convert km/h to m/s.

    54.0 km/h * (1000 m / km) * (1 h / 3600 s) = 15.0 m/s

    Sum of the forces in the radial direction:

    ∑F = ma

    F = m v² / r

    F = (1250 kg) (15.0 m/s) ² / 70.0 m

    F ≈ 4020 N
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