A solid sphere of charge with radius R has a uniform, positive charge density . What is the VS – VIwhere VS is the potential at point S on the sphere’s surface at (R, 0, 0) and VI is the potential at I inside the sphere at (0, R/2, 0)?

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

The dot diagram represents the motion of the motorcycle as it moves from left to right

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?