搜搜考试网Which is Heavier,People or Cars?
来源：学生作业帮 编辑：搜搜考试网作业帮 分类：英语作业 时间：2024/07/11 19:09:39
Which is Heavier,People or Cars?
At the 50th anniversary celebration for the Golden Gate Bridge,
people thronged the roadway.“So many people crowded onto the
Golden Gate Bridge on its 50th anniversary that its arch flattened,
and worried engineers checked whether the load was too great.”
(NY Times,May 26,1987) Compare the mass density (in mass
per area) of cars on the bridge on a normal day and people on the
bridge during the celebration.
there is no necessary for a question to have a question mark.please check the last sentence,"compare the mass density of cars on the bridge on a normal day and the people on the bridge during the celebration"
题目的难度就在于科学得假设适合的数据，日常生活中的物理是不会用具体数据来做的，关键要运用合理的模型，合理的假设。
我是这样算的，普通小车平均自重1.5吨，假设这座桥车全堵停，占地面积3.5*5.5=20平方米（要考虑车道宽度，美国人不太会乱变道），小车加上人平均密度为0.08吨每平米，再加上一些集卡，密度最多0.2吨每平米。而据报道说是站满人，每年元旦我们可以从任何国内的新闻中看到世界各地的新年倒计时，人密度和以前国庆外滩看灯差不多，美国人体型偏大，普通瓷砖的面积占不下一个人，所以密度为80/0.1=800千克每平米，即0.8吨每平米。所以远大于桥上堵满车的时候，更大于平时桥上的质量密度。
这道题我们不需要估计参加庆典的有多少人，不需要知道平时这桥上的车流量，更不需要知道金门大桥的历史。我们要从典型中发现普遍的现象，合理的运用极端假设（车最多时质量密度），运用题干的信息（挤满人），这便是我说的物理题！
At the 50th anniversary celebration for the Golden Gate Bridge,
people thronged the roadway.“So many people crowded onto the
Golden Gate Bridge on its 50th anniversary that its arch flattened,
and worried engineers checked whether the load was too great.”
(NY Times,May 26,1987) Compare the mass density (in mass
per area) of cars on the bridge on a normal day and people on the
bridge during the celebration.
there is no necessary for a question to have a question mark.please check the last sentence,"compare the mass density of cars on the bridge on a normal day and the people on the bridge during the celebration"
题目的难度就在于科学得假设适合的数据，日常生活中的物理是不会用具体数据来做的，关键要运用合理的模型，合理的假设。
我是这样算的，普通小车平均自重1.5吨，假设这座桥车全堵停，占地面积3.5*5.5=20平方米（要考虑车道宽度，美国人不太会乱变道），小车加上人平均密度为0.08吨每平米，再加上一些集卡，密度最多0.2吨每平米。而据报道说是站满人，每年元旦我们可以从任何国内的新闻中看到世界各地的新年倒计时，人密度和以前国庆外滩看灯差不多，美国人体型偏大，普通瓷砖的面积占不下一个人，所以密度为80/0.1=800千克每平米，即0.8吨每平米。所以远大于桥上堵满车的时候，更大于平时桥上的质量密度。
这道题我们不需要估计参加庆典的有多少人，不需要知道平时这桥上的车流量，更不需要知道金门大桥的历史。我们要从典型中发现普遍的现象，合理的运用极端假设（车最多时质量密度），运用题干的信息（挤满人），这便是我说的物理题！
一般的家用小轿车自重1.5顿,占地面积4-5平方米,实际最多是10平方米1.5顿;如果大桥上全是小轿车,平均每车载两人,那么密度是0.18吨/平方米,再加几量集卡,基本上在0.2吨/平方米.
如果全部站人,要考虑当时美国人的体型和耐受能力.如果他们对于该庆典有新年数倒计时一样的热情,那么密度是肯定超过0.2吨/平方米的,一般的话,可能还真差不多
如果全部站人,要考虑当时美国人的体型和耐受能力.如果他们对于该庆典有新年数倒计时一样的热情,那么密度是肯定超过0.2吨/平方米的,一般的话,可能还真差不多
Which is Heavier,People or Cars?
Which is heavier ,the elephant or the beer The elephant is m
Do you think which is heavier in the nature,____ elephant or
Which is heavier,a kilo cotton or a kilo of tomatos?
词性转换：which is heavier ,on iron ball or a _____(word)ball?
which is ( ),the elephant or the rabbit?A heavy B heavier C
Which is heavier,100kg of feather or 100kg of coal.
英语短文解释Should People Own Cars or Not?There is no denying the
which of the two boxes is heavier?This one is heavier than用t
Which planet is much heavier than the first? 求翻译
Whose bag is heavier,you or mine?哪错了?
Who is heavier?your mother or your father?