All of the objects you see around you are made up of what?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Object a has a length of 3 cm, a width of 2 cm, and a height of 4 cm. object b is dropped into a graduated cylinder. it displaces 19 ml of water. the volume of object a is: a: greater than the volume of object b b: less than the volume of object b c: equal to the volume of object b

Coal contains energy. a. light b. kinetic c. chemical d. mechanical