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Plasma2

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I am in an engineering summer camp, but since this is a condensed course and it seems the professors assumed the class already had some background in the subject, I am slowly getting lost. They gave us practice tests from previous years, and I was wondering if someone could show me how to complete a few problems. Though I know you wonderful people will explain your answers, could you also tell what conversions you use as well since that is likely what we will have to apply ourselves? Thanks in advance!

1)

You have two samples of the same material. These samples have different lengths and diameters.

- Sample 1: 10 cm long and 1.0 mm diameter -- Buckling load at failure: 10kN
- Sample 2: 20 cm long and 1.0 mm diameter

2)

A circular rod with a diameter of 10 mm experiences a tensile force of 100 kN. What is the stress in the rod in MPa?

3)

A wire that is 1.0 mm in diameter is stretched from 10.6 cm to 10.9 cm by a force of 150 N. Assuming the elastic limit is not exceeded, what is the force required to stretch the wire from 10.6 cm to 11.1 cm?