It's clear from this app that there are incredibly huge numbers and incredibly small numbers in physics. We want to be able to write them all down without worrying about all the zeroes, so we use scientific notation as a short cut. You'll find those notes at the end of yesterday's powerpoint:
Here are the notes and worksheets from today:
If you understand Significant Digits, you will never have to ask me, "How many digits should I round my answer to?"
Also, here are the solutions to yesterday's homework:
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