2014.07.27【英译中】速度

碎了翅膀 (donna) 路人甲
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发表于:2014-08-03 21:22 [只看楼主] [划词开启]

VELOCITY

速度

Where an object started and where it stopped does not completely describe the motion of the object. For example, the ground that you’re standing on may move 8.0 cm to the left. This motion could take several years and be a sign of the normal slow movement of Earth’s tectonic plates. If this motion takes place in just a second, however, you may be experiencing an earthquake or a landslide. Knowing the speed is important when evaluating motion.

只知道物体从哪儿开始运动的和最终停到哪儿了,并不能描述物体的运动。比如,你所站的地面可能向左移动了8.0厘米。这个运动可能需要几年的时间并且是地球地壳慢运动的一个标志。如果这个运动只发生在一秒内,你可能就要经历一场地震或是山崩了。知道了速度是运动的重要评估因素。

Velocity is not the same as speed

速度不同于速率

In everyday language, the terms speed and velocity are used interchangeably. In physics, however, there is an important distinction between these two terms. As we have seen, velocity describes motion with both a direction and a numerical value (a magnitude) indicating how fast something moves.However, speed has no direction, only magnitude. An object’s average speed is equal to the distance traveled divided by the time interval for the motion.

在日常生活中,速度和速率这两个词是可以互换的。但是在物理里面,这两者却有很重要的区别。速度可以从方向和数值(描述运动的快慢)上描述运动。而速率却没有方向只有数值。一个物体的平均速率等于它运动的距离除以它运动的时间。

Velocity can be interpreted graphically

速度可以用图表示

The velocity of an object can be determined if the object’s position is known at specific times along its path. One way to determine this is to make a graph of the motion. Figure 5 represents such a graph.Notice that time is plotted on the horizontal axis and position is plotted on the vertical axis.

如果一个物体在特定时间点的位置都是知道的,那么它的速度就被确定了。一种确定方式就是通过画出运动图像。图5 就是这样一个图。注意水平轴是时间而竖轴是位置。

最后编辑于:2014-10-29 21:11
分类: 英语
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