A ball of mass 0.40 kg travels horizontally and strikes a vertical wall with a speed of 5.0 ms–1. It rebounds horizontally with a speed of 3.0 ms–1. The ball is in contact with the wall for a time of 0.20 s. What is the average magnitude of the force exerted by the ball on the wall?

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

Ways that industry and agriculture use physical properties to separate substances

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?