Your professor has put 5 objects near the top of an inclined plane: a uniform density solid sphere, a hollow sphere, a hollow cylinder, a special solid cylinder in which the density is proportional to the radius (rho(r) = αr), and a solid cube. The spheres and cylinders have radius R and will roll down the plane, while the cube has sides of length 2R and a frictionless coating, so it will slide down the plane. All objects are released at the same time. Which is the last to get to the bottom of the plane?