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半徑越大線速度越大,向心力固定F=mv^2/r=mw^2r.所以w减小,向心加速度不變因為向心力不變.周約約=2πr/v,v^2/r不變可以看出r的變化快於v.所以週期變大.向心力受力分析的話是不變的,
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