Question

Problem 2. A sailboat and the drag force The force exerted by the wind on a suilboat is approximately perpendicular to proportional to the component of the wind velocity perpendicular to the sail. For the 800-kg 25 points) sailboat shown in Figure 2, the force exerted by the wind on the sailbost is F--(550m .) where twind, is the component of the wind velocity perpendicular a force along the keel (bottom) of the boat that prevents it from moving sideways. Once the boat starts moving forward, water also exerts a drag force backwards on the boat, opposing the forward motion. The magnitude of the drag force is proportional to the speed of the sailboat, i.e., to the sail. Water exerts where thost is the speed of the sailboat and Carng is a constant. kedl |30e Figure 2 (a) [4 points] List forces excerting on the sailboat at the moment of departure. (b) [6 points] If a 17-knot wind (1 knot -0.514 m/s) is blowing to the east, what is the initial acceleration of the sailboat? (e) [4 points] Write down the unit of the constant Carsg in terms of kg, m and s. (d) [4 points) List forces excerting on the sailboat during the sailing (e) [7 pointsl Sketch the speed va. time graph, and explain your graph. (Your graph does not need to be perfect, but must show how the slope changes.)

Answer 1

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