A hydrogen atom is in its lowest energy level when its orbital electron: is within the nucleus
is stationary
has escaped from the atom
is in its ground state

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.