A cyclist and a motorcyclist ride on a straight road. The speed of a cyclist is 21.6 km/h , of a motorcyclist 68.4 km / h
After what time interval will the distance between them be 550 m , if at the beginning the distance between
them was 1375 m ?

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?