这是地球，这是太阳，轨道半径用r表示。
So here is the Earth, here is the sun, mass sun, and the orbital radius is capital r.
玻尔轨道半径与折合质量无关。
地球的轨道半径大约是月球轨道半径的400倍。
The radius of the Earth's orbit is about 400 times the radius of the Moon's orbit.
首先是轨道半径。
轨道半径是，在这个时刻,角度等于θ,这是物体。
R And the track has a radius R, and at this moment in time the angle equals theta, and here is the object.
这个加速度又可根据卫星的速度和它的轨道半径来求得。
The acceleration may in turn be obtained from the velocity of the satellite and the radius of the orbit.
若月球的轨道半径为现在的两倍，还会有日全食现象吗？
If the moon's orbit size were doubled, could we still observe total solar eclipse? (1 point)
后来的数值模拟结果显示出，即使伴星的轨道半径大如海王星的轨道，它仍可汲取物质而形成吸积盘。
Later simulations show that even a companion with an orbit as wide as Neptune's could scoop up an accretion disk.
举例来说当我们讨论径向概率分布时，距离原子核最可能的半径是，比s轨道半径，更近的可以离原子核有多近。
For example, when we're talking about radial probability distributions, the most probable radius is closer into the nucleus than it is for the s orbital.
以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组，但直接求解过于复杂，采取迭代的方法解决。
Non-linear equations are(constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.
由静止卫星的轨道位置示意图可见，地球的平均半径约为6378公里，静止卫星的轨道高度约为35786公里，轨道半径约为42,164公里。
As shown, the earth's mean radius is about 6378 km, while the altitude and orbit radius of a GSO satellite is approximately equal to 35786 km and 42164 km respectively.
它们是轨道的半径，系统的能量以及电子的速度，我接下来给你们展示解法。
They are the radius of the orbit, the energy of the system and the velocity of the electron, and I am just going to present you the solutions.
除了这个，还能得到半径的大小，速度以及周期，假设你在地球上，和这些恒星环绕的，轨道同处一个平面。
And out of this information you get the radius, the velocity and the period, assuming that you are on Earth in the plane of the orbit of the stars.
太阳就变成了所谓哦红巨星，它的半径将会达到以前金星的运行轨道。
The sun will then become what's called a red giant, and its radius will reach just past the orbit of Venus.
中子星的速率,得到轨道的半径，得到周期的大小，如之前讨论过的那样，现在取一个光学的。
That means you can get the speed of the neutron star, you can get the radius of the orbit, and you can get the period, just like we discussed before.
这是在轨道内这个，半径的物体的动能，这是势能。
This is the kinetic energy for something in orbit at this radius, and this is the potential energy.
所以从原则上来说，你们可以决定任何,恒星在轨道中的速度，轨道的半径以及，当然，二元体系的周期。
So, in principle, you can determine for each one of those stars the velocity in orbit, the radius of their orbit and, of course, the period of the binary system.
然后是轨道上的速度,然后是半径。
Out of that pops its velocity in orbit and out of it pops its radius.
这是我们的圆形轨道,半径为r，在点，12点的位置,是我发射火箭的位置。
So this is our circular orbit X with radius r, and at location X, at 12:00, that is where I fire my rocket.
,这个弧度的半径，也是个空气轨道，等于115上下5米。
the radius of curvature of our arc, which is also an air track, equals 115 plus or minus five meters.
是距离，So，，this，distance，here，is，R。,这是轨道的半径,就是电子运动的地方。
R This is the radius of the orbit in which the electron travels.
而是轨道的半径-，你知道了周期，现在情况是。
- not the radius of the donor — you know the radius of the orbit, and you know the period.
但并不是巧合，当然，但如果某物在轨道里，这是在半径r的速度，则总是它的总能量，是势能的一半。
It is not as much a coincidence as you think, of course. But if something is in orbit, this is the orbital speed at radius r, then always is its total energy is half the potential energy.
我们讨论了对于氢原子1s轨道，它的最可能半径在距离原子核a 0处。
And what is discussed is that for a 1 s hydrogen atom, that falls at an a nought distance away from the nucleus.
错误地认为做椭圆运动的卫星在近地点和远地点的轨道曲率半径不同。
Mistakenly believe that doing elliptical motion of the satellite perigee and apogee of the orbit radius of curvature different.
分析了带电粒子受到洛伦兹力和其他恒定外力作用下的运动情况，导出了轨道方程和曲率半径的计算公式。
The motion of charged particle acted upon by Lorentz force and other external force are analyzed, calculating formulae of orbit equation and curvature radius are derived.
是轨道的半径，系统的能量，以及电子的速度，我接下来会给你们讲解其方程的解法。
The radius of the orbit, the energy of the system and the velocity of the electron, I am just going to present you the solutions.
一个天文单位等于地球轨道的平均半径，大约是93，000，000英里。
One astronomical unit is equal to the average radius of the Earth's orBit, aBout 93, 000, 000 miles.
一个天文单位等于地球轨道的平均半径，大约是93，000，000英里。
One astronomical unit is equal to the average radius of the Earth's orBit, aBout 93, 000, 000 miles.
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