posted by Sandhu .
(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?
= mg*mu*900/timein secnds