作者chenkaihsu (Shrek)
看板Physics
标题[问题] 有关於一题物理
时间Tue Nov 4 00:24:52 2008
A 65kg bungee jumper leaps from a bridge.
She is tied to a bungee cord that is
12 m long when unstretched, and falls a total of 31m .
Calculate the spring constant k of the bungee cord assuming Hooke's law
applies.
我ㄉ解法是 (31-12)/65*g这样错了吗??答案不是这个耶......帮我解释一下??
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.123.222.193
1F：→ SmArTyau:用能量守衡去算吧? mgh+0+0=0+(1/2)kx^2+0 11/04 00:30
2F：→ SmArTyau:k=2mgh/x^2=2*65*g*31/19^2=11.16g 11/04 00:32
3F：→ chenkaihsu:the answer is not 11.16..@@ 11/04 13:10
4F：推 tatty:他後面还有个g耶........你确定你有看清楚吗? 11/05 00:01
5F：→ chenkaihsu:sorry iam wrong.....我没看到gggg 11/05 00:13