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  1. So =subject distance from the lens Si=Subject distance from the lens f=focal distance So ^-1+Si^-1=f^-1 f=1/( So ^-1+Si^-1) f=1/((Si+ So ...

  2. ...of the cylinder about its central axis = 0.5 x (100/10) x 0.52 = 1.25 kg m2 So angular acc. of the cylinder = 26 x 0.5/1.25 = 20.8 rad/s2 So 2 secs...

  3. ...'t be changed after the wave is generated. So that it should be a constant. Only the wavelength can be changed when the...

  4. (c) So to speak, the wind speed is reduced to 10 m/s relative to the sea level...

  5. dun think so coz' (1) the skateboard isn't very aerodynamically feasible. (2) the pilot/driver needs to bear great G-force or sth like this. this is not very possible.

  6. ...frictional force is required, and it acts down the slope on the car. So , fcos12* = (1.07 X 104) - (2.55 X 103) Frictional force, f...

  7. 因為電勢能會在通電過程中轉為內能, 從而使電勢減少 so , 電勢差隔距離而增加

  8. ...of question merely appears in CE, but it is not out of syllabus. So , it might be examinated in 2009 CE. Time taken between two ...

  9. ..., we have also the same amount of pressure pressing out to the air so it totally counteract the pressure cause by the outside air. As from the previous answer...

  10. ...quot; = -w^2Asinwt For B, momentum = mx' = mwAcoswt So , when Amplitude A is doubled, momentum is also...