A roller coaster is going through a vertical loop (diameter 35 m) at a constant speed. How fast should the roller coaster be going so the passengers will feel no
more than 3.5 times their normal weight at the bottom of the loop? What force
will they feel from the seat at the top of the loop? What force would they feel halfway between the top and the bottom of the loop?

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.