Shown in the diagram a 4800 kg cable cars descending a Highhill a counterweight of mass 4600 kg on the other side of the hill age the brakes in controlling the cable car speed the Rolling friction of both the cable car and the counterweight are negligible  how much braking force does the cable car need to descend constant speed

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.