A square sheet of rubber has sides that are 20 cm long. If you stretch it so that the area of the rubber is four times larger, how long is each of the sides now?
Each side = cm

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

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.