# Yahoo奇摩 網頁搜尋

1. ### Collision in Two Dimensions

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. ### momentum in two- dimension

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. ### 究竟咩係4d??

In common usage, a dimension (Latin, &quot;measured out&quot;) 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. ### 空氣阻力點計

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. ### double slits exp.

... 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. ### 邊個有最高電阻?

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

7. ### 角簡諧振盪器中，扭轉常數與鋼索的長度、直徑有關係嗎？

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. ### 科學家說空間不止四維，想問一下「五維空間」該怎樣理解？

...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

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

10. ### AL Phy: Measuring Young's modulus of copper

...material. The force constant of a given material depends on the dimensions of it (length, diameter etc), but the Young&#39;s Modulus only...