(adsbygoogle = window.adsbygoogle || []).push({}); torque/force problem - two door hinges - help anyone?

A large door of height - 2.1 m - along y axis that extends vertically upward and width - 0.95 m - along x axis that extends outward from the hinged edge of the door. A hinge at 0.30 m from the top and a hinge at 0.30 m from the bottom, each support half the door's mass which is 28 kg.

(a) In unit-vector notation, what is the force on the door at the top hinge?

___ N i +____ N j

(b) In unit-vector notation, what is the force on the door at the bottom hinge? ___ N i +____ N j

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I don't understand where the horizontal force - vector in i direction - is coming from if there's no horizontal movement and only gravity is acting along the y-axis or j hat

so my answers for the j hat vectors are simply 9.8x14= 137.2N which is the correct answer... but i don't understand parts A and C???

help anyone???

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# Homework Help: Force on door from two hinges - easy - help anyone?

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