Determine the angle formed by the two cords. Engineers Academy

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3.41 The 20-in. tube AB can slide along a horizontal rod. The ends A and B of the tube are connected by elastic cords to the fixed point C.
For the position corresponding to x = 11 in., determine the angle
formed by the two cords, (a) using Eq. (3.32), (b) applying the law of cosines to triangle ABC.

3.42 Solve Prob. 3.41 for the position corresponding to x = 4 in.

Chapter 3
Vector mechanics for engineers by beer and Johnston

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Determine the angle formed by the two cords