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  1. 圖片參考:http://hk.geocities.com/namen1997/P0008.jpg 問題的角度不清楚,可能會有兩種情況,第一種如上圖所示: 在x軸 mAu1 = (mA + mB)v cosθ 2275u1 = (2275 + 1525) x 31 cos43o u1 = 37.9km/h 在y軸 mBu2 = (mA + mB)v sinθ 1525u2...

  2. a) Initial momentum of marble 1 = 0.06 kg m/s in horizontal direction (assumed) Final momentum of marble 1 = 0.04 kg m/s in direction deviated 45 deg. from the horizontal direction. So for the final momentum of marble 1, its component along the horizontal direction = 0.04 cos 45 = 0.02√2 kg m/s...

  3. In common usage, a dimension (Latin, "measured out") is a parameter or measurement...and relevant characteristics of any object within a conceptual space —where the dimensions of a space are the total number of different parameters ...

  4. 空氣阻力 F 與周遭流體的Viscosity和該物件的 dimension 和 velocity 有關係 F = -bv b 是常數 , 與 Viscosity 和 dimension 有關係

  5. ... light source (e.g. a sodium light bulb) has a dimension . If the light source is placed behind two double... small width, plays the role of reducing the dimension of the actual light source.

  6. Assume that each piece of material is of the same dimensions and subject to the same voltage. Then by Ohm's Law, ...

  7. The torsional constant (扭轉常數) a is related to the dimensions of a wire of circular cross-section by the following formula: a = (pi)Gr...

  8. ...係美國哈佛大學的有一個教授叫,lisa randall 係1999年果時發表過一篇叫warpedextra dimension model的論文 當中講到我們的四維世界是由一片膜組成的 而膜外只有重力子才...

  9. How radio waves are produced: Antenna dimensions must generally be comparable to wavelength to work efficiently. Very long waves...

  10. ...material. The force constant of a given material depends on the dimensions of it (length, diameter etc), but the Young's Modulus only...