Which of these weights is required to balance the scales, 90 kg, 128 kg or 160 k

游客2024-08-23 11

问题 Which of these weights is required to balance the scales, 90 kg, 128 kg or 160 kg?

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答案 128kg

解析根据杠杆平衡原理，动力×动力臂=阻力×阻力臂，用代数式表示为F×L1=W×L2，所以80×160=?×10，从而可得出结果。

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