The force of repulsion between two like–charged table tennis balls is 8.2 × 10-7 newtons. if the charge on the two objects is 6.7 × 10-9 coulombs each, what is the distance between the two charges? (k = 9.0 × 109 newton·meters2/coulomb2)

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction

In a system, when potential energy decreases, then entropy also decreases. true false

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 .