7.B Earth Satellites

Escape Speed

When moving faster than 11.2 km/s there's no way for an object to remain in orbit around Earth. Duration: 1:06.

Elliptical Orbits

Hewitt presents the shape of orbit that results when an object moves sideways at a speed greater than 8 km/s. Duration: 2:42.

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Circular/Elliptical Orbit

Paul distinguishes circular and elliptical orbits with force vectors for each. Duration: 4:09