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What is the acceleration due to gravity at the space station.

There are some key words that you need to know for circles: radius, circumference, diameter, sector, segment, tangent, chord and arc. In this video you will discover what they all mean.

This video discusses the topic of circles.

This video explains the equation of a circle.

In this unit you will learn how to identify equivalent metric units of capacity.

In this online course, you will learn how to identify equivalent metric units of mass.

Why do astronauts appear weightless despite being near the Earth?

Basics of gravity and the Law of Universal Gravitation.

In this online lesson you will learn how to compare measurements that have different units.

In this unit you will learn how to convert between common metric units of measure.