What conditions must be met in order for work to be done? Check all that apply.
A. The output force must be greater than the input force.
B. The applied force must make the object move.
c. At least part of the applied force must be in the same direction as
the movement of the object.
D. The work must be greater than the momentum.

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?