# Footnotes

- Page ID
- 1044

[ "article:topic", "authorname:crowellb" ]

- We assume that the door is much more massive than the blob. Under this assumption, the speed at which the door recoils is much less than the original speed of the blob, so the blob has lost essentially all its angular momentum, and given it to the door.
- A proof is given in example 28 on page 284.