Computer Exercise 1 Due Date September 15th 2006 A solid steel rod consisting of n cylindrical elements welded together is subjected to the loading shown. The diameter of element I is denoted by di and the load applied to its lower end by Pi, with the magnitude of Pi of this load being assumed positive if Pi is directed down if it is directed downward as shown and negative otherwise. (a) write a computer program that can be used with either SI or U.S. customary units to determine the average stress in each element of the rod. (b) use this program to solve the problem below. Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Knowing that d1=50mm and d2=30mm, find average normal stress at the midsection of (a) rod Ab and, (b) rod BC. If the average normal stress in either bar must not exceed 140 MPa, determine the smallest allowable values of d1 and d2.

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# Computer Exercise 1