Suppose the moon orbit were not tilted how many total solar eclipses would u expect to see from earth in a year

What are similarities and differences of reflection, refraction, diffraction and absorption?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

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