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# 25.6: Thinking about the Material


## Reflect and research

1. What are some quantities that need to be represented by a vector?
2. Can a vector in three dimensions be represented using spherical coordinates? How would you calculate the scalar product between two vectors represented in spherical coordinates?

This page titled 25.6: Thinking about the Material is shared under a CC BY-SA license and was authored, remixed, and/or curated by Howard Martin revised by Alan Ng.