Question

The wind is blowing at 10 knots. Sailboat racers look for a sailing angle to the 10-knot wind that produces maximum sailing speed. This situation is now represented by the polar graph in the figure shown below. Each point (r, θ) on the graph gives the sailing speed, r, in knots, at an angle θ to the 10-knot wind. What is the speed to the nearest knot, of the sailboat sailing at 120° angle to the wind?



A. 8 knots

B. 9 knots

C. 7 knots

D. 10 knots

Answer 1

Just look at the point at 120 degrees, then compare it to the reference circles (which give the length of the radius, which gives the value of the speed)

Answer 2

SO ITS B. 9 @Numb3r1

Answer 3

It's either A or B. It looked closer to 8 to me, but taking a closer look I think 9 is right.

Answer 4

OK THANK YOU @Numb3r1