Day 149: Angular Size
College-Prep Physics: Looking at the graphs from yesterday’s activity relating angular size to size/distance ration, we saw that it’s a proportional relationship, though the slopes varied between 50 and 80. Much of the variation had to do with estimations, eye-balling, and compounding errors. So we derived the relationship using circle geometry:
Then we put the relation to use, determining the angular sizes of the sun and moon during an annular eclipse, the size of the Earth as seen from the moon, and the size and distances of nebulas and galaxies. Handout: Angular Size Homework 2013 (adapted in part from this).
Conceptual Physics: Chapter 14 quiz on series and parallel circuits. Bike light projects to start next week.
AP Physics C: E&M multiple choice practice questions. Monday is the AP exam! #fingerscrossed