Ring a race a swimmer completes two laps. the first lap is from point a to b; the second is from b to a. each lap is 60 meters long. the average speed for the first lap is 2 m/s; for the second lap it is 4 m/s.(a) how long does it take the swimmer to complete the race

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?