Two charges -72 microcoulomb and +83 microcoulomb if the distance between them is 0.75m. Find the force of attraction.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?