Write a function swap that swaps the first and last elements of a list argument. sample output with input: 'all, good, things, must, end, here' ['here', 'good', 'things', 'must', 'end', 'all']

Knowing that the central portion of link bd has a uniform cross sectional area of 800 mm2 , determine the magnitude of the load p for which the normal stress in link bd is 50 mpa. (hint: link bd is a two-force member.) ans: p = 62.7 kn