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admin 发表于 2024-10-20 22:15:23 | 显示全部楼层 |阅读模式
本题目来源于试卷: newnewnewnew,类别为 IB物理学

[填空题]
In the design process for a child-ress kpynh3w(iq; , yq) 6gy-:sdctraint w.lhrxa s 5gk,x.b.;w chair, an engineer considers the follow .hgwa.s.kbx w5x;rl, ing set of conditions:
A 12$-\mathrm{kg}$ child is riding in the chair, which is securely fastened to the seat of an automobile (Fig. 4-
61). Assume the automobile is involved in a head-on collision with another vehicle. The initial speed $v_{0}$ of the car is 45$ \mathrm{~km} / \mathrm{h}$ , and this speed is reduced to zero during the collision time of 0.20 s .

Assume a constant car deceleration during the collision and estimate the net horizontal force F that the straps of the restraint chair must exert on the child in order to keep her fixed to the chair. Treat the child as a particle and state any additional assumptions made during your analysis.   




参考答案: -750±2%


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