what is a unit vector and
A tractor of weight of 15000N crosses a single span bridge of weight 8000N and of leaned 21.0 m.The bridge span is supported half a met re from either end the tractor,s front wheels take 1/3 of the total weight of the tractor, and the rear wheels are 3m behind the front wheels.the total Lent of the bridge spam is 20m.calculate the force on the bridge supports when the rear wheels are at the middle of the bridge span.
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1. A unit vector is a normalized vector n and is defined as vector quantity V divided by the magnitude of |V|
n= V/ |V|
2. Please restate the problem more clearly or supply a drawing.