A sagging floor is jacked up and a steel girder 10 ft long whose cross sectional area is 6in^2 is put underneath. When the jack is removed, a strain gauge shows that the girder has been compressed by 0.0080in. Find the weight the girder is supporting in lbs and tons.

Answer 1

delta L/L = w /(E A)

.008/120 = w/(E*6)

w = 6 E * .008/120