CAN SOMEONE PLS HELP ME. My homework is due tomorrow and I’m just so confused. I’ll give 100 points to anyone who answers them.
1.
The copper wire used has a diameter of 0.24 mm. What is its cross-sectional area in mm2?
What is this in m2?
2.
A load of 10 N is applied to the wire. What tensile stress does this cause? Remember to include the units in your answer.
3. The load caused the wire to stretch by 3.5 mm from its original length of 1.6 m. What is the tensile strain?
4.
Calculate the Young modulus of copper. Extension questions:
5.
Suppose this sample of wire was replaced with one of half the diameter.
What would be the new value of the stress?
6.
What extension would be produced?
Using steel wire
The copper wire was replaced with a 1.6 m sample of steel wire of diameter 0.24 mm. Steel is stiffer
than copper. Assume that the Young modulus of the steel used is twice that of copper.
7.
What value of extension would you expect for the same load of
10 N?
What length of wire would be needed to give an extension of 3.5 mm?