The tower crane is used to hoist a 2.0mg- load upward at constant velocity. the 1.7mg- jib bd and 0.6-mg jib bc have centers of mass at g1 and g2, respectively.

determine the required mass of the counterweight c so that the resultant moment produced by the load and the weight of the tower crane jibs about point a is zero.
the center of mass for the counterweight is located at g3.

This is a classic problem in statics. The counterweight is placed so that the tower crane would be stable, or the total moment is zero. There are four sources of torques: the load, the jib BD, the jib BC, and the counter weight. Staring with the total moment equals zero, and taking clockwise moments as positive. The units of moment here is Mg * m.

M = 0
(2.0)(12.5) + (1.7)(9.5) - (0.6)(4) - (C)(7.5) = 0
7.5C = 38.75
C = 5.17 Mg

Therefore, the counterweight must be 5.17 Mg.

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Iread this book last year so take this with a grain of salt.gene jumps from the tree to compete with finny due to the fact that gene is always trying to do better than finny. he is put under the grasp of peer pressure due to finny almost forcing him to do this. ever since he first jumped finny kept pressuring him to jump since he thought gene enjoyed jumping.rather than uses this answer you should probably just reread chapters 3-4