The mass of the earth is about 6x1024 kg and its radius is about 6x106 meters. suppose you build a runway along the equator, line-up a million f-16's, bolt them down, and have them all fire their engines (eastward) simultaneously for 1/2 hour. estimate the effect that would have on the rotational speed of the earth. assume the thrust of each plane's engines is 30,000 lbs = 133,000 newtons.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

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.