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1. ### 美國community college問題

Based on the way how you ask the questions, you have absolutely no idea what you are talking about. In answering your questions: 1. It varies. 2. It ...

2. ### 有關現在完成式問題問一問

... for (11-09=2 hrs) I have repaired cars (a car mechanic) for 2 hrs.(and am still saying about it in 11:00:01-11:00:00...

分類：社會及文化 > 語言 2014年03月23日

3. ### F.4 Phy mechanics

At the highest point of the jump, all kinetic energy possessed by the athlete and the potential energy stored in the pole will be turned into gravitational ...

4. ### F.4 Phy mechanics(energy)

I suppose the force increases linearly from s = 0 m to 2 m, and then decreases linearly from s = 2 m to 4 m. The work done by the force equals to the area ...

5. ### F.4 Phy mechanics

Given the mass of the L-shaped bar = 3 kg. Hence, mass of the short limb = 1 kg, and mass of the long limb = 2 kg. When the bar is suspended at the ...

6. ### F.4 Phy mechanics

I presume that the plank is horizontal. (Is there a diagram showing the orientation of the plank?). (a) Let 2L be the length of the plank. Taking moment ...

7. ### F.4 Phy mechanics

May I offer an alternative solution: Resolve the normal force N2 into vertical and horizontal components. The vertical component = (N2)cos(a), and ...

8. ### F.4 Phy mechanics

圖片參考：http://imgcld.yimg.com/8/n/HA00388954/o/20140122230059.jpg Since F1 - F2 is not zero, the block should move. If the block does not move, ...

9. ### F.4 Phy mechanics

圖片參考：http://imgcld.yimg.com/8/n/HA00388954/o/20140122224008.jpg 如圖太細，可把滑鼠移至圖上，按右鍵，另存圖片到電腦上(例如桌面)，再在電腦上開啓， ...

10. ### F.4 Phy mechanics (concept)

The crucial point lies on the fact that you have already had a "fixed rotational centre", or a pivot. The concept of couple is applied to a ...