A 20 C positive charge is held a distance x away from a stationary 10 C negative charge. The positive charge is released and accelerates toward the negative charge, attaining a velocity of 50 m/s when it reaches a distance of 0.5x from the 10 C charge. How far apart were the two particles initially?

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.