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题:用右图所示的滑轮组吊装100袋水泥,每袋水泥的质量是50千克,绳子能承受的最大拉力为1200牛,问至少要用多少次才能吊完?(g=10牛/千克,不计滑轮重力和摩擦)。错误思路:先求出100袋水泥的总
Problem: Lift the 100 bags of cement with the pulley block shown in the right figure. The quality of each bag of cement is 50 kg. The maximum tensile force that the rope can withstand is 1200 N. How many times will it take to hang? (g=10 N/kg , regardless of pulley gravity and friction). Wrong way of thinking: first find the total of 100 bags of cement