The particle P moves down the spiral path which is wrapped around the surface of a right circular cone of base radius b and altitude h. The angle γ between the tangent to the curve at any point and a horizontal tangent to the cone at this point is constant. Also the motion of the particle is controlled so that θ˙ is constant. Determine the expression for the radial acceleration a_r of the particle for any value of θ.

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b h - y Problem 2/181