Charge q1=1.5 nC is located at the coordinate system origin, while charge q2=- -6.31 nC is located at (a, 0), where a-1.3 m. The point P has coordinates (a, b), where b = 0.45 m. A third charge Q3 =-7.5 nC will be placed later. A) Find the electric potential Vp at point P, in volts. Assume that the potential is zero at infinity. B) How much work (W) in joules, would you have to do to bring the third charge, q3 from very far away to point P?
C) What is the total potential energy (U), in joules, of the final configuration of the three charges?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?