[問題] 球殼的質點慣性矩
我剛學物理的動力這部分不久
想請問一下
在課本中有提到球(實心)的慣性矩為2mr^2/5 設球的質量m
這個我已經證明出來(先用圓的質心慣性矩為mr^2/2 然後再去求)
但是如果球換成球殼
質量依舊為m
這樣要如何證明他的質心慣性矩為2mr^2/3呢?
(我只知道空心圓了話是rm^2)@@
p.s ∫r^2 dm 叫做慣性矩吧@@
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