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finding the net force of beam and beam acceleration



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To begin with, let's identify the forces on the beam.


The force of gravity (the weight of the beam), is mg, or 225kg*9.8 m/s2=2205 Newtons downwards.


The crane lifts the beam by applying a force of 2430N upwards.


The net force, then, must be 2430N-2205N = 225N upwards


The beam's acceleration can be found from Newton's 2nd Law, Fnet=ma, so a=Fnet/m=225N/225kg=1 m/s2 upwards.

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