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  1. 1st: In fact, in HKCEE level , students are only required to learn machanics restricted to uniform acceleration, so that v²=u²+2as is applicable.It is because you can only put in one value into the equation. a...

  2. 1. (a) Luminosity when the sun was first formed = 3.9x10^26/1.4 w = 2.786 x 10^26 w (b) Radius of the sun when it was formed = 7x10^5/1.06 km = 6.604x10^5 km = 6.604 x 10^8 m Surface area of the sun = 4.pi x (6.604x10^8)^2 m^2 = 5.481 x 10^18 m^2 (c) Using...

  3. ... by DC at 600 volts or so. Today , transmission-level voltages are usually ... but are occasionally used on long lines with light loads. Voltages less than 33...

  4. 看過亦答過閣下的幾個問題, 小弟發覺你的想像力不錯, 但想像力要能實現才有意義. 小弟不太明白閣下問題中的建議是甚麼, 依我理解, 應該是希望用雷射等射線去清除飛機前面的空氣以減低空氣阻力. 不過閣下應該還是一個未學高等物理的小朋友, 如果你學過物理, 就會知道高能量射線不能...

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