1.

Let FG be the gravitational force, FD be the drag force and FB be the buoyant force. Which of the following best describes the relation between these forces when a sphere falls into a fluid with terminal velocity?

A. F<sub>G</sub> + F<sub>D</sub> = F<sub>B</sub>
B. F<sub>G</sub> + 2F<sub>B</sub> = F<sub>D</sub>
C. 2F<sub>B</sub> + F<sub>D</sub> = F<sub>G</sub>
D. F<sub>B</sub> + F<sub>D</sub> = F<sub>G</sub>
Answer» E.


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