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  1. For a dry cell, the "1.5 v" is only a nominal volatge. The actual voltage... than 1.5v, especially for new cells. Hence, when you put the three dry cells together in series, the total voltage is higher than the nominal...

  2. ...evapouration rate is slow. But when the surrounding air is dry , the evapouration rate is fast. Because latent heat (潛熱) is...

  3. ...already at its melting point. Wipe the ice surface with a piece of dry cloth or tissue paper to remove the melted water. You could then start...

  4. ...循環, 吹了一段時間後還是濕度上升而降溫率下降 另外你可以找psychrometric chart, dry bulb temperature, wet bulb temperature wet bulb temperature 就是你的那空氣在一定的原本...

  5. (a) Use equation of motion: v^2 = u^2 + 2a.s with v = 0 m/s, u = 14 m/s, s = 14 m, a =? Hence, 0 = 14^2 + 2a(14) a = -7 m/s^2 (the -ve sign indicates a deceleration) Since deceleration = change of velocity/time i.e. braking time = change of velocity/deceleration = 14/7 s = 2 s (b) Use equation...

  6. ... slightly during contact. The magnitude of the rolling friction between dry surfaces is influenced by the coefficient of friction between...

  7. ...less and less because of evapouration. Wet clothes hanging up get dried because of evapouration. 2. As the name implies, "expansion joints...

  8. a.衣服被幹掛遠高於篝火晚會它是由向上的熱空氣從底下的篝火當前正在幹。 b.一塊巧克力融化在你的嘴。它是由在你嘴裡的溫暖唾液接觸熔化。 c.對月球表面的太陽落山后的降溫它的表面由於缺乏的太陽輻射熱量的降溫。 在我看來, c 最有優勢,因为輻射是發射熱的最佳途徑。

  9. ...in air, making the dusts carry charges. During very dry weather (this usually occurs in winter in Hong Kong), the ...

  10. 1(a):F=ma 45000-1000(3)=20000(3)a a=0.7ms^-2 (b):T1 is the tension in the coupling chain between (wagon no.1) and (engine). T2 is the tension in the coupling chain between (wagon no.1) and (wagon no.2).T3 is the tension in the...