(a) Write the formulas similar to Equations 4 for the center of mass (x, y, z) of a thin wire in the shape of a space curve C if the wire has density function p(x, y, z).

(b) Find the center of mass of a wire in the shape of the helix x = 2 sin t, y = 2 cos t, z = 3t, 0 < t < 2π, if the density is a constant k.