Ovens cook food by heating up coils which heats up the air inside the oven. Imagine placing cookie dough into an oven that only has coils in the middle of the oven on the bottom. Where would you want to place the cookie dough so that it cooks the slowest? Explain using your knowledge of convection.

Which of the following changes to a pipe would increase the conductance by a factor of 12? 1.quadrupling the length and tripling the radius.2.reducing the length by a factor of and doubling the radius.3.tripling the length and reducing the radius by a factor of .4.reducing the length but a factor of and doubling the radius.

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

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?