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Question:

What is the resultant force acting on the following girder?

A crane is lifting a girder up with a force of 3000 NTwo workers help to position the girder by pulling on ropes attached to the girderOne worker pulls with a force of 400 N east and the other worker pulls with a force of 500 N northFind the resultant force that acts on the girder.

Answer:

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Assume that the force up is balanced by the weight down We can ignore the 3000 N UPThis makes sense since we are not given an acceleration upApply the Pythagorean Theorem 500^2 + 400^2 Resultant^2 Then inverse trig to get angle cos^-1 400/Resultant for angle CCW from East

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