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16 August, 21:09

A car of mass 1000 kg travels around a level curve of radius 40 m. If the maximum frictional force that can be exerted upon the car by the road (determined by the coefficient of friction between the tires and the road) is 7000 N how fast can the car travel without "spinning out?"

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  1. 16 August, 23:39
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    The car can travel V=19.8m/s without spinning out

    Explanation:

    Given that

    Mass of the car m=1000kg

    Radius of curve r = 40m

    frictional force R=7000N

    Coefficient of friction u=?

    We know that F=uR

    But F=ma

    F=1000*9.81

    F=9810N

    Therefore u=F/R

    u=9810/7000

    u=1.40

    For the car to travel without spinning out we

    Equate it centripetal force formula to frictional force formula

    F=mv²/r

    F=ur

    hence mv²/r=uR

    Making velocity subject of formula we have v²=u*r*R/m

    V² = (1.4*40*7000) / 1000

    V²=392

    V=√ 392

    V=19.8m/s
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