Circle the letter of the number of energy levels needed for a lithium atom’s three electrons when the atom is in its ground state. A) zero B) two C) one D) three

What is binding energy and separation energy

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?