Physics Unit9: Static Equilibrium, Elasticity and Fracture (id: 7fc81a576)

本题目来源于试卷: Physics Unit9: Static Equilibrium, Elasticity and Fracture，类别为 通用国际物理

[单选题]
A lever is 5.0 m long. The distmcmg-5+tt+tb xa*wc 6ancjpt wxsw:zues() r c+/sz3by k,+*6noe from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to bew*zbs+ jsyp: soz+c/ (w3 e rxukn6)t, lifted, how much force must be exerted on the lever?

A. $600 \; N$
B. $750 \; N$
C. $3000 \; N$
D. $12000 \; N$


参考答案:  B


本题详细解析: 暂无

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