ENGG 202 Lecture Notes - Lecture 1: Unit Vector
26 Jan 2015
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Review 3d vectors: to stabilize a tree partially uprooted in a storm, cables ab and ac are attached to the upper trunk of the tree and then are fastened to steel rods anchored in the ground. Ab is 4. 2 kn, determine (a) the components of the force exerted by this cable on the tree and (b) the angles x, y, z for this force. Therefore, to find the angle, take the inverse cosine of each component of the unit vector. Or use the equations from page 10 of your notes. 2*) given the tension force t = 10 kn, determine the weight of the block, w, necessary for the pulley-cable system to be in equilibrium. Solution strategy: there are 2 cables in this system, cable 1 over pulleys c and b and cable 2 over pulley d. each cable has a different tension. 3*) for each case (a) and (b), determine the force p required to maintain equilibrium.
