Abeetle crawling around on a desk walks 19 cm in 17 seconds to the right. it then changes direction and walks 6 cm in 6 seconds to the left. what is the average speed of the beetle in cm/s?

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?