The 0.5kg soccer ball moves toward the net with a force of 4N. What is its acceleration?​

What does the law of conservation of mass state?

Could we see a galaxy that is 20 billion light-years away?

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?