因此，可以通过密度求一个平面物体的质量。
移动物体的力与该物体的质量成正比。
The force moving a body is proportional to the mass of the body.
移动一个物体的力与该物体的质量成正比。
The force moving a body is proportional to the mass of the body.
测量一个物体的质量就是测量其中的能量。
一个物体的质量就是其所含能量的度量单位。
The mass of an object is the measure of the energy contained in it.
也可以这么说，“它和物体的质量，成正比。”
And we could have said, "Yeah, it's probably proportional to the mass somehow."
引力的力量的大小，取决于物体的质量，或物质的总量。
Gravity's strength depends on an object's mass, or amount of matter.
有一质量为m1的物体。
一个平面物体的密度是每单位面积元的质量。
The density for a flat object would be the mass per unit area.
引力透镜现象就是光被巨大质量物体弯曲的现象。
A gravitational lens is formed when light is bent by a massive object.
因此你马上能看到，在弹簧的例子中，物体质量影响周期。
So you can immediately see that with the spring, the mass must enter into the period.
最明显的答案是在那边有一个极为巨大的物体，它的质量远远大于我们所知道的宇宙里的任何物体。
The most obvious answer is that there is something big out there, far bigger than anything in our known universe.
质量是小m的,物体围绕着,大M作圆周运动。
There's an object mass little m going in a circle around capital M.
测量物体在静止时的质量。
引力的拉力取决于物体的大小，或者更确切地说，取决于质量。
The pull of gravity depends upon size, or, more accurate ly, upon mass.
空间物体的重力取决于物体质量。
质量越大的物体所受到的重力也就越大。
The more massive an object, the stronger the gravity force applied to it.
在气垫导轨上研究了变质量物体在变力作用下的运动规律。
The motion of variable mass system under variable force is studied using air track.
质量：物体所含物质的多少。
最好的类型和质量的光线取决于不同的物体。
如果物体定义为零质量，那么它的默认状态就是静态的。
Bodies have zero mass by default, therefore they are static by default.
如果物体定义为零质量，那么它的默认状态就是静态的。
Bodies have zero mass by default, therefore they are static by default.
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