EM 306 – Statics TEST 1 Spring 2007 - Landis
Name ___________________________________
EID ___________________________________
Unique Number ___________________________
Instructions: Both problems require a correctly drawn and labeled free body diagram. Show all
of your work. Place a box around your final answers and include units.
Problem 1. The bar is 1-m long, and its weight W acts at its midpoint. The distance b = 0.75-m,
and the angle
α
= 30°. The spring constant is k = 100 N/m, and the spring is unstretched when
the bar is vertical. Determine W and the reactions at A. Recall that a linear spring exerts a force
F
s=k L !L0
( )
, where k is the spring constant, L is the stretched (current) length of the spring,
and L0 is the unstretched length of the spring. (25 points)
