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回答: 借贵宝地，求解一题 由 backup1 于 2017-07-25 20:35
Not very sure, but probably the last one (the 4th) is the strongest and the first is the weakest. On the 4th anchor bar,the resistance force at the end (of the bar) has the greater torque. Let a straight short stick be the anchor,you the ground and your friend the puller. In which way is it easier for your friend to move the stick: (1) You are holding the stick with your two hands on one end of the stick while your friend is holding the stick with his two hands on the other end of the stick. (2) You are holding the stick with one hand on one end of the stick and the other hand on the other end while your friend is holding the stick with his two hands on the middle of the stick. Let me know if I am right or wrong when you get the answer from your teacher.