Acopper wire is 1.6 m long and its diameter is 1.1 mm. if the wire hangs vertically, how much weight (in n) must be added to its free end in order to stretch it 2.8 mm?

Weight required = 194.51 N

Explanation:

The elongation is given by

Length , L= 1.6 m

Diameter, d = 1.1 mm

Area

Change in length, ΔL = 2.8 mm = 0.0028 m

Young's modulus of copper, E = 117 GPa = 117 x 10⁹ Pa

Substituting,

Weight required = 194.51 N

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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.