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You’ve been hired by your state’s environmental agency to monitor carbon dioxide levels just above rivers, with the goal of understanding whether river water acts as a source or sink of CO2. You’ve constructed the apparatus shown in Fig. 12.38, consisting of a boom mounted on a pivot, a vertical support, and a rope with pulley for raising and lowering the boom so its end can extend different distances over the river. In addition, there's a separate rope and pulley for dropping the sampling apparatus so it’s just above the river.
FIGURE 12.38 Passage Problem 64–67
The tension in the boom rope will be greatest when
- a. the boom is horizontal.
- b. the boom rope is horizontal.
- c. the boom is vertical.
- d. in some orientation other than (a), (b), or (c).
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