Suppose that the plank has a mass 15 kg, and we place 10 kg on the left side at a distance 2.00 m from the fulcrum, and a mass 20 kg on the right side at a distance 1.00 m form the fulcrum (so that the plank is balanced). What will be the force exerted by the fulcrum on the plank

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?