. An asteroid orbits the Earth in an asymmetric elliptical orbit shown as the dotted line below. Draw a FBD for the asteroid and use it to explain why the asteroid's speed increases as it approaches its parent body (the Earth) and decreases as it moves away. Hint: The newest equation for gravity may also be helpful.

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

Diamond will scratch quartz. true or false

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