13-95. Using air pressure, the 0.5-kg ball is forced to move through the tube lying in the horizontal plane and having the shape of a logarithmic spiral. If the tangential force

exerted on the ball due to air pressure is 6 N, determine the rate of increase in the ball's speed at the instant 0 = π/2. Also, what is the angle y from the extended radial coordinater to the line of action of the 6-N force? Problem 13-95 r = 0.2e0.10 F = 6 N