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15 questions
如附圖所示,甲物體所受向西的作用力大小為多少?(一格代表5 gw)
4 gw
10 gw
20 gw
40 gw
如附圖,將重量不同的四個物體,分別掛在性質完全相同的甲、乙、丙、丁四條彈簧下端,其伸長量不同,則何者所受的彈簧拉力最大?(均未超過彈簧的彈性限度)
甲
乙
丙
丁
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