(a) Find the length of a wire in the shape of the helix r(t) = 2 sint, y = 2 cost, z=3t, 0t 2 then deduce its mass if density is a constant k. (b) Find the mass of a wire in the shape of the helix x(t)=t, y = cost, z = sint, 0t 2 if the density at any point is equal to the square of its distance from the origin.