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(a).A 220-kg sleigh is pulled by one horse at constant velocity for 0.90 km on a snowy, horizontal surface, the coefficient of kinetic friction between the sleigh runners and snow is 0.27. What power must the horse deliver to the sleigh for the trip to take 9 minutes?

(b) Image a motor to lift heavy objects.What must be the minimum power of the motor to lift 750-kg load at 1.0 m/s?

  • Physics -

    Power=work/time= force*distance/time
    = mg*mu*900/timein secnds

    power= mg*velocity

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