3道英文版物理题，求解答，附加高悬赏！

来源：百度知道 编辑：UC知道 时间：2024/06/21 14:39:05
1.why is it that when cars pass each other at high speed on the road, they tend to be"drawn" to each other?
2.why does the fire in a fireplace burn more brisky on a windy day?
3.how many newtons of lift are exerted on the wings of an airplane that have a total area of 100m² when the difference in air pressure below and above the wings is 5% of atmospheric pressure？

1.A high-speed car will bring along the air that is close to it. According to the Bernoulli effect,the faster the air flows, the lower pressure it has. Therefore, the air pressure on the outer sides of the two cars is higher than that on their closer sides, generating a force that "drawn" them to each other.

2.On a windy day, the air above the chimney flows fast, resulting in a relatively low pressure on the openning of the chimney. Therefore, air is force through the chimney from down the fireplace, bringing more oxygen to the fire. That's why the fire burns more brisky.

3. the same answer as the 1st floor

1.声音传输速度受到了影响，由V=340m/s+（V1+V2）变为V=340m/s-（V1+V2）
2.俗话说，火借风势，风的作用使空气流通更快，也就是使燃烧区供氧量更加充足，自燃烧得更旺。风对火苗的推动作用也是重要原因
3. 5%×1.01×100000×100=505000N

1，因为两车之间的空气流速较大，相应的空气压力降低，小于外侧空气的压力，所以汽车会被大气向内侧“推”

2，因为为在刮大风的日子，空气流速大，火焰周围通过燃烧产生的二氧化碳被快速带走，补充过来的新鲜空气氧气浓度较大，有助于燃烧。

3，一个标准大气压=101300Pa=101300N/M^2
设上表面大气压