The outer planets are mostly formed of the lighter elements, hydrogen and helium, because these elements condense at a temperature, further from the sun. 1. lower 2.equal 3.higher

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

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