About how much pressure do the feet of a 6000 kg elephant exert on the ground assuming each foot has an area of 0.10 square meter

What’s #16 asking and how do i solve it?

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.

How are positive ions different from neutral atoms