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What is Newton's law of gravitation?
牛顿的万有引力定律是什么？
How is gravity related to the other
fundamental forces?
重力与其他基本力有什么关系？
What is the inverse square law? To what
besides gravity does it apply?
什么是平方反比定律？它除了重力之外还适用于哪些领域？
Does the larger Earth exert a larger
gravitational force on the smaller
Moon than it exerts on the Earth?
地球对较小的月球施加的引力是否比对地球本身施加的更大？
What causes the tides? Why are there two per day
instead of just one?
潮汐是由什么引起的？为什么每天会出现两次而不是一次？
How does the force of gravity change with distance
outside the Earth? inside the Earth?
地球的引力随着距离如何变化？在地球内部如何变化？
If an object weighs 600 N at the Earth's surface, what
will it weigh twice as far out from the Earth's center?
...three times as far out?
如果一个物体在地球表面的重量是600牛顿，那么当它离地球中心两倍远时，它的重量会是多少？……三倍远时呢？
How would you calculate your weight in orbit?
在轨道上如何计算你的重量？
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