A rod “X”, has a positive charge of 5. An otherwise identical rod, “Y”, has a negative charge of 12. The rods are touched together and then separated. a) When they touched, what particles moved between them?
b) Did the particles move from “X” to “Y” or from “Y” to “X”.

28. evolution

29. environment, survive, offspring  

explanation:

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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be subject to a force andchange its motion

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.