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高二物理(1)
Aug 20th 2013, 08:21

1.有A和B兩球在同一平面上,A球由比地面高H處以30m/s的初速及30度的俯角拋下,B球在與A球水平距離d處鉛直向上拋出,若兩球相撞於B球運動最高點處,則H+d=?

2.有相同六個彈簧組裝成A(三個彈簧並聯)B(兩個彈簧並聯)C(一個彈簧),今將ABC三組串聯,則
(1)當受到作用力F時,A伸長6cm,則B和C分別伸長多少?
(2)若三組總伸長量為11cm,則作用力變為多少?
(3)承(2)ABC三組伸長量分別為多少?

3.欲要在客廳裡掛上一幅重1公斤重的畫(含畫框),畫框的背面有兩個相距1公尺且位置固定的釘子;將畫對稱的掛在牆壁的掛鉤上,掛繩最多可以承受1公斤重的張力,掛好後調整細繩成緊繃;若細繩可承受的張力與繩長無關,則細繩至少要多少公尺才不會斷?

4.重量為W的物體,至於斜角theta的光滑平面上,有一水平作用力F作用於物體,使其靜止於斜面,則斜面作用於物體上的正向力為多少?

5.重W之球置於兩光滑平板之間,兩板夾角37度,則兩板AB對球的作用力量值之比為?

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