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  1. ...the planet as it falls toward the sun, and decelerates it on the way back out . Kepler's third law The squares of the orbital...

  2. ...surface (primarily along its sides, as friction forces at the front and back cancel themselves out ), plus pressure forces, which act in a direction perpendicular to the object&#39...

  3. ...total internal reflection occurs. The light ray will be reflected back , and cannot emerge out . (b) Let n be the refractive index. For light to emerge out , angle θ should...

  4. a) Taking all upward quantities as positive. Consider the journey of the first 4 seconds: u = 0 m/s a = 9.4 m/s2 t = 4 s v = u + at v = (0) + (9.4)(4) Final velocity = 37.6 m/s s = ut + (1/2)at2 s = (0)(4) + (1/2)(9.4)(4)2 s = 75.2 m Consider the journey just after 4.0 s and...

  5. ... magnesium sulfate, for example, it can cause a hydroxide ion to "pop out " and then jump back into place, removing a bit of energy from the sound wave. Raising the...

  6. As what you have pointed out , the work done by the back emf equals to mechanical output of the motor. i.e. (current)( back emf)=(torque)(angular...

  7. ...container and seal it in place with plasticine. Weigh the back of the marg container with more plasticine in the centre...an opposite and equal reaction. The air rushing out of the straw is the action, and the equal reaction is...

  8. Q1. (i) easy to store, e.g. can be easily liqified and stored in a can; (ii) low carbon and low polluting after combustion, thus reducing greenhouse gas emission; (iii) high specific calorific value, i.e. it produces more heat per unit mass than other fuels. Q2: An odourant...

  9. The particle could go back to P, but the motion is clearly NOT simple harmonic. If the...

  10. ...in B. The coil moves away from the solenoid. 呢條題目會否是 out of syllbus? 我記得呢樣野係以前我AL有考, 唔知CE係唔係...