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  1. a) For the ball travel from C to the net, time taken is t1 Vertical displacment = 0.4 - 0.15 = 1/2 * g * t1^2 0.25 = 1/2 * 10 * t1^2 t1 = 0.2236s Horizontal displacement = 1.35 = v * t1 v = 6.037 m/s b) For the ball travel from C to D, time taken...

  2. map,because map have symbols to show the buildings and streets clearly than photo. 我好有信心,應該冇錯>< symbols系記號咁解...

  3. Your diagram shows that point P is at a higher potential than point Q. If P and Q are connected together (via a resistor, say), there will be a current flowing from P to Q

  4. First of all, the circuit can be redrawn as follows: 圖片參考:http://i117.photobucket.com/albums/o61/billy_hywung/April07/Current1.jpg Where k is the fraction of the resistance values of the rheostat distributed among the...

  5. ...theta;, cosφ-a)/(a+1-2acosφ)^1.5, θ=-π~π, φ=0~π. To show the resutant force is 0, it suffices to show that ∫[0,π] (cos&phi...

  6. The displacement-time (s-t) graph of the particle shows the following facts: (i) the period of the wave is 2 s (ii...

  7. Applet shows interference of waves from two point sources. The white ...

  8. 熒光 圖片參考:http://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Fluorit_uv_hg.jpg/180px-Fluorit_uv_hg.jpg 圖片參考:http://zh.wikipedia.org/skins-1.5/common/images/magnify-clip.png Fluorite under white (left) and shortwave UV-Light...

  9. When actual temperature difference is 100 C, the temperature difference shown on the thermeter is 80 C. So when the temperature difference shown ...

  10. http://en.wikipedia.org/wiki/Index_of_refraction