A point moves in a circle of radius 0.10m with constant angular speed 4rad s−1. Its projection on a fixed diameter is considered. When the point is at an angle of 30∘ from the positive end of that diameter, what is the ratio of the speed of the projection to the speed of the point on the circle?
(a) 0.58
(b) 0.50
(c) 0.87
(d) 1.00