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1. 2題超難物理選擇題

20) (答案B) 利用比熱容的公式及吸熱等於失熱方法計算 m1c1ΔT1 = m2c2ΔT2 0.8 c1(100-38) = 0.3x4200x(38-23) c1 = 381J kg-1 oC-1 21) (答案A) c1 = m2c2ΔT2 / (m1ΔT1) = 0.3x4200x(T-23)/[0.8x(100-T...

2. 有什麼軟件可以將影片轉90度角?

...，開video file，選功能表的Video＞Filters...＞Add...＞ rotate ，選 Left by 90° 或 Right by 90° 附圖片

分類：電腦及互聯網 > 軟體 2008年01月09日

3. F.4 Phy mechanics (concept)

...example, if the two parallel and opposite forces are acting to the left of a fixed pivot, it tends to make the body to rotate about a point (say, point P) between the two forces in the clockwise direction...

4. simple question about Linear Algebra--Matrix

...the y-axis, the vectors along the y-axis is left fixed. Therefore T(e2)=e2, and the...on this plane, and the unit vector in z direction is rotated to the unit vector in the x direction, it is obviously...

分類：科學及數學 > 數學 2008年02月07日

5. dc motor's energy conservation

When a coil rotates in a magnetic field, there is electromotive force (emf) ...to counter-balance its rotational motion. The coil can rotate by its own inertia. Once the coil is ...

6. Phase relationship

...magnitude. This shows that the oscillating object is at the left extreme position. The acceleration vector ao lies on the +ve x-axis. ...

...resize rotate share buy prints delete resize rotate auto-fix remove red-eye crop add text see much more... ... (320 x 240) More options Left Right Flip Upside-down print at...

8. F5 MATH COS/SIN/TAN

...resize rotate share buy prints delete resize rotate auto-fix remove red-eye crop add text see much more... ... (640 x 480) More options Left Right Flip Upside-down print at...

分類：科學及數學 > 數學 2008年10月25日

9. Earth s rotation

there were no meaning on clockwise and anticlockwise in space, similarly no up and down, left or right. the noun of revlove is revolution.

10. how does a simple galvanometer work?

...amp;quot;out of the paper, by Fleming&#39;s left hand rule, the current-carrying wire experiences... upward combining the effects, the coil rotates in anti-clockwise direction 所以我覺得怪ge地方係佢幅圖支...