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[認真] 有冇師兄識(PHY)mechanical reasoning?

有冇師兄識(PHY)mechanical reasoning?

有冇師兄識mechanical reasoning?
我大佬要考消防,佢要考mechanical reasoning...
有條例,但係唔識,有冇師兄識解?

The objest was fixed on one end. If some fore is applied to lift the other end, which direction to apply with save energy most?

a. Direction A
b. Direction B
c. Direction C
d. All the same.

有冇師兄識點解?
THX...
萬分感謝...

[ 本帖最後由 sam524 於 12-6-2010 15:07 編輯 ]

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引用:
原帖由 louisli 於 12-6-2010 16:01 發表
C 囉
地心吸力向下,要最慳力,當然唔好向上拉 (B);打斜拉時(A),仲要比力去改變件物件的形態喎
唔係好明A同C, 可唔可以再解釋, 唔該

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係呀

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唔該曬師兄們解答...

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