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Perceptions

机译：知觉

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One of my favorite mantras when giving a lecture or being interviewed is "Technological progress comes from doing things differently in an unpredictable way. The future is not an extrapolation of the past." The context is usually related to an objection that aliens can't possibly visit Earth, so none are visiting. Usually, additional objections are along the lines that it would take too long or too much energy or they couldn't deal with the acceleration, etc. As an example, in physics department colloquia I give on campuses, I point out that, yes, 1G the acceleration associated with gravity at the surface of the Earth is 21 mph/ second. The answer I usually get when I ask for the acceleration at 1G is 9.8 meters per second squared. But that seems to be totally unclear. I then ask how long it takes at 1G to get to the speed of light. It is multiple choice and I give four choices: 1,000 years, 100 years, 10 years or one year. Almost nobody thinks it is only one year, which it is. In other words, a car accelerating at 1G in three seconds will be doing 63 mph and is a pretty hot car. It turns out that the amount of acceleration Earthlings can handle depends on several factors: the direction of the accelerating force on the body, the duration of the force, and the magnitude. Obviously, we can handle 1G for a very long time indeed. Perhaps the reader will have noticed that the astronauts are launched on their backs because they can stand more Gs back to front than foot to head. Testing on centrifuges show that a trained pilot can perform a tracking task while being accelerated at 14 Gs for two minutes. That is about 300 mph per second. It turns out one can stand 30 Gs for one second (That is 0 to 600 miles per hour in one second). Obviously, one isn't walking around drinking a beer while this is going on. Anybody familiar with reports of right angle turns by UFOs is aware that they don't slow down first and then accelerate. It is zip-zip.
机译：在演讲或接受采访时，我最喜欢的口头禅之一是：“技术进步来自于以一种无法预测的方式做不同的事情。未来不是过去的推论。”上下文通常与一个异议有关，即外星人无法访问地球，因此没有人在访问。通常，还会有其他异议，因为它们会花费太长时间或过多的能量，或者它们无法处理加速度等问题。例如，在我在校园里举行的一次物理系座谈会上，我指出是的， 1G与地球表面的重力相关的加速度为21 mph /秒。当我要求1G加速时，我通常得到的答案是9.8米/秒平方。但这似乎还不清楚。然后我问1G达到光速需要多长时间。这是多重选择，我给出四个选择：1,000年，100年，10年或一年。几乎没有人认为只有一年。换句话说，在三秒内以1G加速的汽车将以63 mph的速度行驶，这是一辆非常热的汽车。事实证明，地球人可以处理的加速量取决于几个因素：身体上加速力的方向，作用力的持续时间和大小。显然，我们确实可以在很长的时间内处理1G。也许读者会注意到，宇航员是背对背发射的，因为他们背对背站着的Gs比脚对头要多。对离心机的测试表明，训练有素的飞行员可以执行跟踪任务，同时以14 Gs的速度加速两分钟。大约每秒300 mph。事实证明，一台设备可以承受30 Gs的负载一秒钟（即一秒钟内每小时0到600英里）。显然，在这种情况下，人们不会四处走动喝啤酒。不熟悉UFO直角转弯报告的人都知道，它们不会先减速然后加速。是zip-zip。

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