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The two trees in Fig. 9–58 are 7.6 m apart. A back-packer is trying to lift his pack out
Chapter 9, Problem 24P(choose chapter or problem)
The two trees in Fig. 9–58 are 7.6 m apart. A back-packer is trying to lift his pack out of the reach of bears. Calculate the magnitude of the force that he must exert downward to hold a 19-kg backpack so that the rope sags at its midpoint by (a) 1.5 m, (b) 0.15 m.
Questions & Answers
QUESTION:
The two trees in Fig. 9–58 are 7.6 m apart. A back-packer is trying to lift his pack out of the reach of bears. Calculate the magnitude of the force that he must exert downward to hold a 19-kg backpack so that the rope sags at its midpoint by (a) 1.5 m, (b) 0.15 m.
ANSWER:
Solution 24P
Step 1 of 2
Part a
We are required to calculate the magnitude of force when the rope sags by 1.5 m.
Let us have a look at the following figure.
The weight of the pack N
N
From the figure,
And,
N
N
Therefore, the required force is N.