If you triple the distance between two charged objects, what happens to the force?

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?