If you drop something off the Empire State Building, why doesn't it orbit the Earth?

Question

BlackTom AI · Accepted Answer

When evaluating why dropping something from the Empire State Building does not result in an orbit, we should examine each statement and test it against what we know about orbital motion and gravity.
Option 1: 'The building is not in space' — This is the most directly relevant reason. Orbiting the Earth requires an object to be moving at a sufficient horizontal (t horizontal) velocity while being at a relatively low air resistance altitude. The Empire State Building is far from space; it sits on the ground within Earth's atmosphere, so simply dropping an object does not give it the necessary orbital path. In other words, being in space is a prerequisite for a natural stable orbit under typical conditions.
Option 2: 'Only rockets can orbit the Earth' — This is incorrect. Orbits are defined by velocity and trajectory, not by the vehicle type. Anything that achieves the right horizontal speed at the right altitude can orbit, including the possibility of a satellite or a projectile immediately after launch, provided it has the right speed and is in space or near space with low atmospheric drag. Rockets are common launch vehicles, but they are not strictly the only means to orbit.
Option 3: 'The building is stationary on the ground' — This is misleading. Even if something were temporarily moving relative to the ground, it still wouldn’t orbit unless its velocity and altitude place it on a curved, free-falling trajectory around the Earth. The fact that the building is on the ground simply means its initial conditions are far from those required for an orbit. The key point is velocity and altitude, not whether the object is momentarily at rest with respect to the ground.
Option 4: 'Gravity at the building is too strong to allow orbits' — This is a misconception. Gravity at Earth's surface is what keeps us grounded and is what would keep an orbiting body in a curved path if it had the appropriate horizontal velocity. The strength of gravity isn’t the limiting factor; it’s the combination of gravity with the necessary tangential velocity and altitude. In essence, gravity is part of the reason orbits exist, not a barrier that prevents them from occurring at ground level.
Overall, the correct understanding is that orbit requires appropriate orbital velocity at a sufficient altitude, and being on the ground simply means the conditions for an orbit are not met; thus, the statement about not being in space best captures the primary reason.

ASTR-1-45046-F25 Lecture: Orbits

If you drop something off the Empire State Building, why doesn't it orbit the Earth?

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ASTR-1-45046-F25 Lecture: Orbits

If you drop something off the Empire State Building, why doesn't it orbit the Earth?

查看解析

登录即可查看完整答案

类似问题

​What causes an asteroid to drop out of orbit and travel toward Earth?

Which location is the Perihelion?

If the Sun disappeared, what would happen to the Earth’s orbit?

一颗彗星沿着一条非常细长的轨道运行，靠近太阳，然后向外飞去很远。对于定性模型来说，哪个表述最准确？

低地球轨道上的一颗卫星短暂启动推进器，以提高其沿路径的速度。从定性角度来看，它的轨道会发生什么变化？

Which of these observations would allow you to measure the mass of a planet?

The point in the Earth's orbit around the Sun where the Earth is closest to the Sun is known as the:

更多留学生实用工具

希望你的学习变得更简单

What causes an asteroid to drop out of orbit and travel toward Earth?