A postive charge is placed next to an unkown charge. There is a repulsive force between them. What charge is the unknown force and how do you know?

Most energy in an ecosystem comes originally from_

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Wave functions describe orbitals in a hydrogen atom. each function is characterized by 3 quantum numbers: n, l, and ml. if the value of n = 2: the quantum number l can have values from to . the total number of orbitals possible at the n = 2 energy level is .