If you punch a wall with the force of 30N, what force will you feel on your fist

When an object is heated it contracts. a. true b. false

Explain what happens at the saturation point when adding salt to water at room temperature.

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?