Acouch of mass 210 kg is being pushed across the floor with an applied force of 4100 n. the coefficient of kinetic friction between the couch and the floor is 0.38 find the normal force on the couch. find the acceleration of the couch

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?

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force

If you drive 12 miles north and 35 miles east, what is the direct distance between you and your starting point?