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Angular acceleration

A racing car accelerates from 50 km per hour to 200 km per hour in 3.0 seconds along a straight track, and the acceleration is constant during this period. If the axles are 40 cm above the road, what is the magnitude of the angular acceleration of the wheels?

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Anon

  1. well, in each rotation of the wheel, the wagon goes 2PI*r
    speed car=2PIr/timeforonerotation=w*r
    w=speedcar/r so change those speed in km/hr to m/s, find wi and wf

    angacceleration= (wf-wi)/3sec

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    bobpursley

  2. So 200km/h is 55.5 m/s and 50km/h is 13.75 m/s.

    Wi=55.5/0.4=138.75
    Wf=13.75/0.4=34.36

    (138.75-34.36)/3= 34.7

    Thanks bob. I think this is correct, forgive my lack of units.

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    Anon

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