Two particles with charges 6e and -5e are initially very far apart (effectively an infinite distance apart). They are then fixed at positions that are 6.64 x 10-11 m apart. What is EPEfinal - EPEinitial, which is the change in the electric potential energy

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Which is not true about oxygen-17 and oxygen-18?

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.