Science circles back on itself so that useful ideas are built upon and used to learn even more about the natural world.
1.)true
2.)false

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

What are chlorofluorocarbons and what impact do they have on the atmosphere?

The material that keeps its new shape after it is stretched is called?