Explain why aluminium and potassium nitrate solution will not react when mixed together.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

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 is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.