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  1. (a) (i) Let D minutes be the duration, D ~ N(4.2, 0.6²...

    分類:科學及數學 > 數學 2013年12月15日

  2. Let h be the depth of the water level, so h/2 is the radius. Volume (V) = (1/3)π(h/2)^2(h...dt = 10 - 16 = -6, that is, -6 = (1/4)π(4^2)(dh/dt) dh/dt = -3/(2π) (a) Water level is falling at a rate 3/(2π) cm/s where h = 4. (b) Maximum depth occurs when dV/dt = 0, that is...

    分類:科學及數學 > 數學 2013年12月04日

  3. Let mass of small sphere be m. Since mass of sphere is proportional to the cube of its radius, mass of large sphere = m(2a/a)^2 = 8m (a) Vertical distance fell by each sphere when the large sphere touches the ground = (h - 2a) Hence, speed of each sphere u...

  4. ------Analysis No. 4-------(1)The Part with thesis statement=topic sentence:- (1a)We must try control our schedule. (2b)We've learnt American work shortest hrs. due to Politics. -----The union and...

    分類:社會及文化 > 語言 2013年11月27日

  5. 有部份的答案是政治面的。長久以來,美國人的工作時數,比世上其他種族要來的長。我們感覺像是被壓縮在行程表裡。每個人,包括打零工者,領最低薪資的工人,都期待有多一些假期。這顯然是一個刻不容緩,改善現況的解決方案之一。減短每周的工時,這是早在 20 世紀初,就有勞工...

    分類:社會及文化 > 語言 2013年11月26日

  6. have been have cost have hit have hurt have let have put have read have set have shut have done... have eaten have driven have fallen have freezen have given have hidden have...

    分類:社會及文化 > 語言 2013年10月31日

  7. 1. Let d be the horizontal distance travelled by the flare, and t be...2.514 m = 12.95 m (c) Consider the ball's vertical falling motion, use equation v = u + at with u = 0 m/s, a = -g(=-10 m/s^2...

  8. ... Hence, deceleration of the elevator = 4000/2000 m/s^2 = 2 m/s^2 2. Let v be the speed of the ornament and missile immediately after collision By conservation...

  9. ... answer is option B. When the vessel is in free fall , both the water and vessel travel at the same downward speed. The water cannot leak out. 8. Let m be the mass of each block Use net-force = mass x acceleration F - f...

  10. 我覺得信唔過, 貓相好易搵, 點知真定假, 呢個價錢香港都買到, 即場交易好d

    分類:寵物 > 2013年09月22日

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