10. A diver is collecting shells under water. They see a very large and beautiful shell so they reach out to pick it up. After several missed attempts to grab the shell, the diver places it in a dive bag and surfaces. At the surface the diver is surprised that the shell is smaller than they thought. Explain this phenomenon.

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Acombination reaction is when two or more combine to form one product. a decomposition reaction is when a substance breaks down into two or more simpler substances in a chemical reaction.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final