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Question: 

The two trees in Fig. 9–51 are 6.6 m apart. A backpacker is trying to lift his pack out of the reach of bears. Calculate the magnitude of the force $\vec{F}$ that he must exert downward to hold a 19-kg backpack so that the rope sags at its midpoint by

  1. 1.5 m,
  2. 0.15 m.
Problems 8 and 70.

Figure 9-51.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. $220 \textrm{ N}$
  2. $2.0 \times 10^3 \textrm{ N}$

Giancoli 7th Edition, Chapter 9, Problem 8

(2:42)

Chapter 9, Problem 8 is solved.

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