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  1. when 是一個特定時間 ... when Peter leave. while 是一段特定時間, 那段時間所做的事用進行式表達。 ... while Peter watching TV programme.

  2. ...temperature is a measure of average KINETIC ENERGY of a substance. when the substance is solidifying , it release latent heat at a constant temperature...

  3. .../3R)2R=1/9(V2/R), when one of the bulb in parallel gone, the equivalent resistance... from 4/9 to 1/4 which becomes dimmer, while the power of parallel bulb changed from 1/9 to 1/4...

  4. ...that the water acts as a spring obeying Hooke's law when floating the raft. The force constant of the spring would be 76 x 10...

  5. When extension = 0.08 m, the tension of the spring is 100 x 0.08 = 8 N. ...

  6. this is because the ray is pointing to the centre of the circle then, the ray in the glass is the radius radius perp. to the tangent while tangent is the normal when the ray enters the glass perp. towards the normal => no refraction.

  7. When the block is sliding down, it speed is constant. Thus the...θ) where m is the mass of the block g is the acceleration due to gravity When the block is going up the inclined plane, the retarding...

  8. ...light smooth pulley. The mass of 6 kg is held 1 m above the floor while the mass of 2 kg is resting on the floor. Find the upward displacement of the 2 kg mass when the system is released. Assume g = 10m/s^2 When ...

  9. ...kt + A, while A is a constant T = 25 + B*exp(-kt), while B = exp(A) When t = 0, T = 100, and t = 5, T = 75 so, B = 75 and k = 0.0811...

  10. Time dilation and length contraction must go together. A fast moving observer experiences both time dilation and length contraction at the same time. This resulted in measuring a constant speed of light irrespective of the relative speed between the observer and the light source...