Two metal bars are made of invar and a third bar is made of aluminum. At 0 degre

Question

Two metal bars are made of invar and a third bar is made of aluminum. At 0 degrees Celsius, each of the three bars is drilled with two holes 40.0cm apart. Pins are put through the holes to assemble the bars into an equilateral triangle as in figure P19.44 (I don't know how to include an illustration). (a) First ignore the expansion of the invar. Find the angle between the invar bars as a function of Celsius temperature. (b) Is your answer accurate for negative as well as positive temperatures? (c) Is it accurate for zero degrees Celsius? (d) Solve the problem again, including the expansion of the invar. Aluminum melts at 660 degrees Celsius and invar at 1,427 degrees Celsius, assume the tabulated expansion coefficients are constants What are the (e) the greatest and the (f) smallest attainable angles between the invar bars?

Explanation / Answer

a)ignoring expansion of the invar, find the angles between the invar bars as a function of Celsius temperature b)is the answer accurate for negative as well as positive temps and c) for 0°C d)assuming the tabulated expansion coefficients are constant, solve again including expansion of the invar e and f) find the greatest and smallest attainable angles between the invar bars I know this is a long problem with a lot of work but can anyone at least get me started, im stuck as far as how to even start [b]3. The attempt at a solution[/b aluminum melts at 660°C and invar at 1427°C

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