Flux may be removed by use of a cotton bud and which reagent?

How do you know the gauge is correctly mounted?

To what is the catalyst directly applied?

What is the correct order in which the reagents should be applied to the beam during the cleaning step?

Which direction should the strain gauge terminals face when mounted?

How is the strain gauge reading changed in each iteration?

What piece of laboratory equipment would you use to carefully handle the strain gauge throughout the practical?

3.3 Calculate the final length of the aluminium bar (4 significant figures).

At room temperature (20 °C), there is a 0.38 mm gap between the ends of a copper and an aluminium rod, respectively, as shown in the figure. The copper rod is conical with an outer diameter that changes from 25 mm to 50 mm over 200 mm.  The aluminium rod has a constant outer diameter of 25 mm over 250 mm.

3.1 Calculate the maximum stress in the bars if the temperature is raised to 184 °C. (3 significant figures)

Note that the maximum stress is the largest compressive or tensile strength. Use typical sign convention of a positive value for a tensile stress.

3.2 Calculate the total deformation of the aluminium bar, δ_Al and the copper bar, δ_Cu for the conditions in 3.1.

Use this information to select the correct answer from the choices below.