Four masses (m= 500g) are at the corners of a very thin rigid sheet (ignore the mass of the sheet), with sides L= 25.0 cm. F1= 2.50 N, F2= 4.25 N. (a) Find the angular acceleration about the center O If F1 is the only force being applied.(b) Find the angular acceleration about the center O for F2is the only force being applied.(c) Find the angular acceleration about the center O if both forces are applied at the same time.

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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.