Answer: Youve been hired by your states environmental agency to monitor carbon dioxide

Chapter 12, Problem 64

(choose chapter or problem)

Youve been hired by your states 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. Youve 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, theres a separate rope and pulley for dropping the sampling apparatus so its just above the river. Boom rope Sampling rope Pulley Sampling apparatus Boom Pulley Pivot Figure 12.38 Passage 6467 When the boom rope is horizontal, it cant exert any vertical force. Therefore, a. its impossible to hold the boom with the boom rope horizontal. b. the boom rope tension becomes infinite. c. the pivot supplies the necessary vertical force. d. the boom rope exerts no torque.