A person bends over to push a couch across the room. Their arms are angled up at 18 degrees as they apply a 400N force. How hard are they
pushing the couch horizontally?

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom

What are the dimensions of the cross section that passes through the points a, f, g, and d?

In which of these cases are the two wave points considered to be in phase with each other?