# Session 2: Time ⏱

1. Download Anki here, and install it.
2. Download the Atomic Structure 1 Anki deck here, and open it in Anki.
3. In Preferences, change to use the "V2 experimental scheduler".
4. Study the deck using your keyboard shortcuts.

I made Anki decks for studying French, Spanish, Japanese, Mandarin ab initio, and more. The language decks features pronunciation, pinyin, and are categorized in multiple ways. You can find some of these decks in your Google Folder. You can use them for your own learning, but please do not share with others.

The spreadsheet with pendulum swing data from your class is here. Make a Copy.

Insert a new column, and in this Column D, calculate the average time it requires to make one swing.

Decide if you want to plot one histogram with both 0.25 m and 0.5 m length, or two separate ones.

Plot the histogram(s) using column D.

Adjust the bin sizes and horizontal scale. Use good taste and judgment.

Introspect. What does "good taste and judgment" mean? Is there a way to turn this subjective aesthetic into an objective algorithm?

Convert the absolute uncertainties into relative uncertainties.

100 ± 20

The relative (percent) uncertainty is 100 ± ___%

Go back to look at the durations for the pendulum swings. How should we report the time it takes for the 0.25 m pendulum to swing? How did you come up with the interval? What could be some reasons that the pendulum didn't all took the same time to swing?

100 ± (20 / 100 x 100%)

How do you go backwards from relative uncertainty to absolute uncertainties?