An object moves in clockwise motion from point D to point C and then counterclockwise to point B. What total distance has the object traveled? Round your answer to two significant figures. (Hint: the circumference of a circle is 2πr)

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?