A 23.0-kg backpack is suspended midway between two trees
Chapter 9, Problem 70(choose chapter or problem)
A 23.0-kg backpack is suspended midway between two trees by a light cord as in Fig. 9–51. A bear grabs the backpack and pulls vertically downward with a constant force, so that each section of cord makes an angle of \(27^{\circ}\) below the horizontal. Initially, without the bear pulling, the angle was \(15^{\circ}\); the tension in the cord with the bear pulling is double what it was when he was not. Calculate the force the bear is exerting on the backpack.
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