Category: 07 Gravitation

7.6 PCOE Problems

A projectile escaping from a gravitational well. This video explains how to apply PCOE to solve such problems.

A projectile is hopping from one gravitational well to another. This video explains how to apply PCOE to solve such problems.

7.3.1 Escape Velocity

We are all born in the Earth’s gravitational well. Ever thought of jumping out of it?

Ok, let’s calculate the speed we need to jump at, in order to bid farewell to Earth.

7.2.3 True g and Apparent g

The Earth’s rotation actually causes us to “lose weight” at the equator.

The Earth’s rotation also causes the acceleration of free fall to be lower at the equator.

So how big an effect does the Earth’s rotation have?

In an orbiting space station, where the gravitational acceleration is exactly equal to the centripetal acceleration, apparent g drops to zero.

Actually, it does not have to be centripetal acceleration. As long as we free fall together with our (also free falling) vehicle, we become weightless.

As long as the plane accelerates at g downward, you experience zero g.