Drag is created inside the path the air is moving when it encounters a solid object. Typically, for instance in automobiles and aircraft, drag is undesirable as it usually takes electric power to overcome it. You will discover, on the other hand, some cases when drag is beneficial, such as with parachutes, such as.
Automobiles started off making use of aerodynamic system styles inside the early component in their heritage. As engines turned much more powerful and cars became more quickly, automobile engineers understood that wind resistance appreciably hindered their speed.
Self-healing 'living skin' can make robots far more humanlike — and it seems equally as creepy when you'd hope
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The shape of the airplane’s wings is exactly what makes it ready to fly. Airplanes’ wings are curved on prime and flatter on the bottom. That form helps make air circulation excessive quicker than less than the bottom. So, much less air tension is on top of the wing.
在寒冷的冬天，我们关上门窗，形成一个封闭式的环境，阻挡室外寒冷空气的进入。随着我们吸一口空气中的氧气，呼出一口身体内产生的二氧化碳，房间内的氧气得不到补充，而二氧化碳浓度却越来越高。这个时候我们并不想开窗通风，因为一开窗，冷空气、雾霾和室外噪音就会进入室内。夏天我们因为常开空调，也不愿意开窗通风，这样室内的空气虽然变得凉爽，但完全没有新鲜空气进来，二氧化碳的浓度不断上升。结果，很多人在家里和办公室一直处于缺氧状态，时间长了对身体有很大的危害。
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