[理工] [動力學] 100年成大對答案
1.
(a).在慣性座標下，物體受到的外力和會等於物體總質量乘上質心加速度。
(b).對時間積分可得衝量動量原理
對位移內積可得功能原理
(c).動力學中的功能原理通常只探討機械能(位能、動能)，如果遇到碰撞、摩擦等等
能量會轉換到熱能或者應變能的時候，功能原理在此會不適用。
2.
sinθ-μcosθ
Vmax = √(───────)ρg
cosθ-μsinθ
sinθ+μcosθ
Vmin = √(───────)ρg
cosθ+μsinθ
3. N = 0.277 N
arm
4. V = 9.375 in/s
c
a = 54.65 in/s^2
c
5. R = 288.68 N (↓)
Ay
α = 23.1 rad/s^2 (C.C.W.)
希望能與版友可以互相討論^^
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