Young's modulus is expressed as:
, where F is force for stretch, l0 is the initial length, A is the area where the force acts perpendicularly.
A student is testing a 1.0 m length of 4.0-mm steel wire.
How much force is required to stretch this wire by 1.0 mm? Young's modulus for steel is 20x1010 N/m2. Express your answer to two significant figures and include the appropriate units.
What length of 8.0-mm-diameter wire would be stretched by 1.0 mm by this force?
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