它可以研究人类球员的动作和球的速度。

It can study the movements of human players and the speeds of the ball.

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然而，阻力系数CD，也取决于球的速度。

It appears, however, that the "drag coefficient", CD, also depends on the velocity of the ball.

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挡板的速度会影响球的速度和方向吗？

Does the speed of the paddle influence the ball speed and direction?

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For example, if we're talking about a pitcher, like Matsuzaka, we might want to know the speed of his average fastball.

举例来说，如果我们谈到一个投手，就像松阪，我们想知道他投出,快球的平均速度。

麻省理工公开课 - 化学原理课程节选

So, if we're trying to figure out the wavelength of a Matsuzaka fastball, we need to consider the velocity first, which is 42 miles per hour.

如果我们尝试计算一个,松阪发出快球的波长，我们首先需要考虑速度，每小时为42英里。

麻省理工公开课 - 化学原理课程节选

There are no other molecules on that side of the wall. So there's an attractive force that makes the velocity within not quite as fast.

墙的另一边没有分子,因此吸引力,会降低球的速度。

麻省理工公开课 - 热力学与动力学课程节选