Statics - 3D Moment about a point example 5

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Sir please tell me about Fb, Fb is clockwise, so why you not right - sign

shahfaisal
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As usual beautiful explanation... Sir.. One small query please. in these questions, coordinates are pre draw, if we are in some practical scenario and we have to then choose coordinate, how do we draw them ? if there are certain points we need to consider as to where to choose origin and x, y, z direction ? if Hibbeler book mentions about it in some chapter in detail ? Thank you

shailkumarjain