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問PHY 2005 CE MC Q.11 AND Q.28

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問PHY 2005 CE MC Q.11 AND Q.28 可唔可以解釋下個答案問黎?

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Q11) First of all, all magnifying glasses are made of convex lens and also, the image formed by the lens should be virtual when functioning as a magnifying glass. So ans = A Q28) A: If direction is ignored, the blocks will move with the same speed since the string remains in tension during the motion. B: Same as before, the blocks should have identical motion as a result of the string being in tension. C: Since the blocks have the same acceleration but different mass, the resultant forces on them have different magnitude according to the relation F = ma. D: Since the pulley is smooth, the tensions on two sides of the string should be equal. So ans = C

其他解答:

11. A 由於方便閱讀,所以像一定是正立(erect),所以只可以係A或C,C係凹透鏡,所產生的像必定是縮小,但圖中的是放大,所以肯定係錯。圖A則正確地用作圖法則繪的光線圖。 28. c 合力是指所有作於物體上的所有力的向量和,在問題中有繩的張力及物體本身的重量,因為係同一條繩,分別作用於兩物的張力,大小係一樣。但係兩物的重量不是一樣,所以不力的量值並不相同。 2007-07-10 17:26:30 補充: 打錯小小字,最後的是 "所以合力的量值並不相同"至於速率及加速度的量值,由於被繩子限制,所以會以同步伐移動,所以速率(不是速度)及加速度的量值是相等
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