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2)If a force of 500 Ib toward the center must be exerted by the road to keep your car moving around acircular track at 30 miles/hr ; what would
be the required road force at 60 miles/hr at 90miles/hr?



3)the friction between acrate and the floor is characterized by astatic friction coefficientMs=0.4 and akinetic friction coefficient Mk=0.2. how much force will
be required to start the 140 Ib crate in motion and how much force will be required to keep it in motion at a constant speed




4)Tow masses,3kg and 8kg are attached by a rigid uniform bar of mass 2kg such that their centers are 50cm apart .find the ******** of the center of gravity of this combination .(Assume that the masses may be treated as point masses on the ends of a50cm rod,and that the mass of the bar itself can treated as a point mass at the center 0f the bar)