A girl throws a rock horizontally from a bridge that is 24 m above the water. It lands in a toy boat that is 18 m away from the base of the bridge where she stands. With what speed was the rock thrown, assuming negligible air resistance?

Why do astronauts in the space shuttle weigh less?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=