(Answered) A in friction problems the text uses r in place of the

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A) In friction problems, the text uses R in place of the frictional force and normal force. Derive R. and why is Micro= tan (Q). Q is not theta, not Beta, not gamma. I don't know how to explain, I think it is called Si.

B) What is the difference between Truss and a Frame? And what is the difference between frame and machine?

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