[問題] 90年台大普通物理(A)
1.
天文觀測發現不管距離宇宙中心為何,宇宙中的星球大致皆以v的速率對宇宙
中心做等速圓周運動。假設是宇宙為球形,取宇宙中心為原點,問宇宙中
質量密度隨r變化的關係。
我的答案 ρr^2 = 定值
參考書答案ρr^3 = 定值
想請問大家那個正確? 還是另有正解呢?@@
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