...d it gets discharged in a fraction of a second through the first available ground path, frequently an electronic device. Note that these numbers assume the person is not wearing clothing capable of carrying an additional charge, which is normally the case. There are different models for calculating ...
...向指向矢量的方向,线段的长度与矢量的大小成正比。 如何写向量 A vector can be written down in several ways. One method is to use bold characters e.g. . You can also use an underline ( ) or an arrow drawn on top of a letter ( ). If the symbol for a vector is written with...
射弹是涉及二维的运动。为了解决弹丸运动问题,取两个相互垂直的方向(通常,我们使用“水平”和“垂直”方向),并将所有矢量(位移、速度、加速度)作为沿每个方向的分量。在弹丸中,垂直运动独立于水平运...
...在不同的地方变化。例如,月球表面的引力场强度大约是地球表面引力场强度的六分之一。因此,如果两个质量相同的物体中的一个在地球上,另一个在月球上,它们仍将承受不同的重量。月球上的物体“重量”将减少六倍!浴...
...指磁场强度。测量磁场强度的国际单位是特斯拉(T)。地球的磁场强度在不同的地方变化,但它是在微特斯拉的顺序。医院里的核磁共振成像仪所用的磁铁往往会产生几个特斯拉的磁场,而我们所能产生的最强磁场大约是90吨。...
...ogy) vs. 地理(geography) 地质学和地理学是从科学的角度研究地球的两个领域。地质学是研究地球的物理结构和物质、它们的历史以及作用于它们的过程的学科。地理学是研究地球及其大气层的物理特征,以及影响和受其影响的人类...
关键区别:地表水是指存在于地球表面的水,如湖泊、池塘、海洋等。地下水是指渗入并储存在地下的水。 地表水和地下水是两种资源,我们通过这两种资源获得饮用水、洗涤水、烹饪水等。在这些水到达家庭水龙头之前,市...
在英语语法中,名词性动词是直接由名词构成的动词,如to dust(来自名词dust)、to victize(来自名词受害者)和to defrost(来自名词frost)。 名词动词的类型包括:(1)修饰性动词(如覆盖、附加和连字号)(2) 方位动词(如...
...忆力。 "I always tell the truth. Even when I lie." "Every day above ground is a good day." "In this country, you gotta make the money first. Then when you get the money, you get the power. Then when you get the power, then you get the women." Tony Montana: "Me, I want what's coming to me." Ma...
...ooks at the ball, which sits high on the tee and already seems free of the ground. Very simply he brings the clubhead around his shoulder into it. The sound has a hollowness, a singleness he hasn't heard before. His arms force his head up and his ball is hung way out, lunarly pale against the beauti...