March 28, 2017

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A 710kg car drives at a constant speed of 23m/s . It is subject to a drag force of 500 N. What power is required from the car's engine to drive the car (a) on level ground? (b) up a hill with a slope of 2.0∘ ?

  • Physics - ,

    P=Fv=500•23 =11500 N
    F=F(dr)+mgsinα=500+710•9.8•sin2=500+242.8 =742.8 N
    P=Fv=742.8•23=17085 N

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