11. If a 1 kg spear is thrown at 10 m/s and gets imbedded into a 9 kg wooden box that was at rest, how fast does the wooden box and embedded spear move after the collision?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

0.09 moles of sodium sulfate in 12 ml of solution

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.