Ball 1 is thrown straight down from the top of a building with a given initial speed. At the same time ball 2 is thrown straight up from the top of the same building with the same initial speed. Air resistance is negligible. If ball 1 has a speed v just before hitting the ground, what is the speed of the ball 2 just before hitting the ground? V/2
7/4
4v
2v

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet. whats one advantage of using electromagnetic in devices

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. when you increase the plate separation, what happens to the following quantities?