They deduced the center of mass between the two heavyweights and found that Andromeda may indeed be twice as massive as the Milky Way.

他们根据重量级推导出质心，然后发现仙女座也许真是银河系2倍。

If the big kid is two times as heavyas the little kid, then their mutual center of mass will be two times closer to the big kid than to thelittle kid.

如果大孩子重量是小孩子2倍，那么质心位置离大孩子距离就比离小孩子距离近2倍。

In reality, both circle around their mutual center of mass, located between the two.

事实上，两都围绕着位于两之间相互质心旋转。

These are sets of two stars that orbit around a common center of mass.

即由两颗恒星组成组合，们围绕一个共同质心运行。

And if you think about that, that makes a great deal of sense because as a prey is attacked, such as a whale, and it tries to turn, it's going to turn around its center of mass.

如果想一下，这非常合乎情理因为要是像鲸这样猎物遭到攻击，就会试图转向，这种旋转会以质心为轴。

Centripetal acceleration is equal to V squared over R. This V squared is for the center of mass of something moving around an axis.

向心加速度等于速度平方除以半径。速度平方是指绕轴运动物体质心。

Timing and smooth execution are essentials in a sport but understanding enough physics, particularly the torques in the center of mass is also necessary.

在一项运动，和流畅执行是必不可少，但了解足够物理，特别是质心扭矩也是必要。

With a low center of mass, the wheel just swings back and forth like a pendulum, then stops.

当质心较低，车轮就像钟摆一样来回摆动，然后停止。

And yet, collected together, they have a single total amount that they spin about their center of mass.

但聚集在一起，们有一个单一总不变量，他们总是围绕着们质心旋转。

There's a simple way to figure out where the center of mass is.

有一个简单方法找出质心。

Within a given supercluster, all galaxy motions will be directed inward, toward the center of mass.

而在超星系团内部，所有星系都是向内部质心运动。

The moving parts that make one side of the wheel heavier also shift its center of mass downward below the axle.

使车轮一侧更重运动部件也将其质心向下移至车轴下方。

The stars all orbit the cluster's center of mass, even though there may not be anything at the very center.

所有恒星都围绕着星团质心旋转，即使在最心可能没有任何东西。

The answer is in the center of mass.

答案就是质心。

The 1.52 meters is how much her center of mass is raised above its landing point.

52 米是她质心比着陆点高出多少。

To make the seesaw work, theheavy kid must push that center of mass forward until it just touches the pivot.

要想让跷跷板摇动，重孩子就得往间挪直到质心移到心。

Three times heavier and the center of mass will be three times closer. And so on.

重三倍，质心位置就进三倍，以此类推。

So the reason the heavy kid sits on the ground while the light kid is up in the air is that theirmutual center of mass is on the heavy kid's side of the pivot.

因此，重小孩坐在地上而轻小孩悬在空原因是，他们共同质心在重孩子这边。

The center of mass is a pointsomewhere along the plank that holds the two kids where their average weight falls.

质心是跷跷板上支撑两个孩子平均重量一个点。

If it was spanning six seconds, you would multiply the center of mass by six.

如果持续了六秒，你会将质心乘以六。