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

  8. 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. 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. 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 ...