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分析称泰坦尼克中露丝体重若轻20斤杰克或存活
网络截图□晨报记者 关健
近日，3D版《泰坦尼克号》在网上产生的话题效应仍在持续发酵，果壳网的一位编辑运用物理学中的浮力公式推导得出，如果露丝的体重能轻20斤,九旬老人白发返黑 称因儿媳孝顺，杰克很可能爬上木板活下来。眼下，类似用科学来解释电影的这波热潮中涌现出不少喜欢较真的“学术帝”，也让《泰坦尼克号》带来的思维发散愈发丰富。
露丝如果能轻20斤……
“杰克其实真的能活下来的。”目前，一张有关木板漂浮的搞笑图片正在微博上被疯狂转发，图中真人演示了杰克和露丝怎样在一块木板上共存，甚至设计出两人打牌、扮酷的姿势(如图)。
与这番恶搞相比，“理科生”的分析更彰显科学精神。18日，果壳网编辑“吴师傅”发布了一篇技术帖，通过对剧照进行估算，并结合阿基米德浮力定律得出结论：因为露丝的体重，求生木板上只能容下一人。
文中借助剧照，再结合女主角温斯莱特的身高(1.73米)和手腕宽度(预估5厘米)，木板的尺寸被估计为长2.1米、宽1米，露出水面的高度是2.5厘米。假设浮力“极限值”木板上表面与海平面齐平，此时通过浮力公式计算出该木板还能再承载的重量是54.075千克，约110斤，这显然大于身高1.82米的男主角迪卡普里奥的应有体重。
随即，这种奇特的分析思路在网上引发了广泛兴趣,同校同届12名学生被牛津录取，该计算方法得到了不少网友的认可。网友调侃称：“看来保持体型还是相当重要的。”
科学分析引“较真”
既然有人用科学去解释虚构的电影，就不乏一些人抱有同样的严谨态度去刨根问底。因此上述推理也引来一些反驳声，但这些质疑大多集中在未被该推导考虑在内的细节因素，而非针对计算方法本身。
●木板实际已经分担了杰克的部分体重
代表网友“大漠孤烟-亚克西”：死理性派还是不够理性啊，杰克已经半个身子攀着木板了，说明肯定木板已经承担了杰克的部分重量，应该为了挽救杰克的性命重新计算一次。俗话说“救人一命胜造七级浮屠”啊,全国包邮。
●海水不是湖面
代表网友“Spikespark”：原则上在海水里是有海浪的，海浪的波幅应该不会低于0.1米，躺两个人就意味着两个人都会一直保持半浸水的状态,低碳生活成共识电子支付让保险更“绿色”，和泡在冰水里的人并无异样。
●对木板露出水面的高度的估计太片面
代表网友“9_sir”：计算浮板露出水面厚度的图里，露丝的位置处在板的一头，重心偏向露丝面对的方向，那么露丝面向那头的木板肯定是下沉得更多。只有露丝的重心和木板的重心垂直方向上重合，木板距离水面的高度才能用来计算浮力，肯定是比2.5厘米大的，也许到4厘米或5厘米也说不定。
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