In order to maintain the balance of the lever, the force and distance shall conform to the following relationship,$$F_1l_1$$=$$F_2l_2$$ .$$l_1$$=2m,$$l_2$$=3m . $$F_1$$=12N,$$F_2$$=?
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数学PS
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In order to maintain the balance of the lever, the force and distance shall conform to the following relationship,$$F_1l_1$$=$$F_2l_2$$ .$$l_1$$=2m,$$l_2$$=3m . $$F_1$$=12N,$$F_2$$=?
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正确答案: C