Physics Unit9: Static Equilibrium, Elasticity and Fracture (id: 8b6cd7c42)

本题目来源于试卷: Physics Unit9: Static Equilibrium, Elasticity and Fracture，类别为 国际高中通用物理

[单选题]
Assuming the lower arm has a mass of 2.8 kg and its CG is 12 cmm,8;zlf5axc3vycz+ni/hb s 6 from the elbs n8fn r,3w*si. ux1kuow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm tk1s ,iru.u sf*xn3nw8o hold a 7.5 kg shot put (Fig. 9-1)?

A. $100 \; N$
B. 500 N
C. 1000 N
D. $1500 \; N$


参考答案:  C


本题详细解析: 暂无

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