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09_1090_hw7

# 09_1090_hw7 - Physics 1090 Homework#7 Due Thursday October...

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Physics 1090 Homework #7 Due Thursday, October 29, 2:00 pm Reading assignment : Chapters 15, 16 of the notes . 1. Measure your reaction time using Galileo’s concept of acceleration If you hold a ruler against a wall, and let it fall, assuming it’s not in contact with the wall, it will pick up speed at a rate of 10 meters per second per second. (a) Use this fact to write down how fast it’s going after: 0.1 sec., 0.12 sec., 0.15 sec., 0.18 sec., 0.2 sec. (b) Now figure out its average speed during the first 0.1 sec., the first 0.12 sec., …, 0.2 sec. (c) Use the only formula I said you should know to find how far it falls in the first 0.1 sec., then in 0.12 sec., 0.15 sec., 0.18 sec., 0.2 sec. (d) Use these results to plot a graph of distance as a function of time from time 0 to time 0.2 sec. (Guess the first 0.1 sec.—remembering it always falls four times as far in twice the time!) (e) Use your graph and a friend to find your reaction time, and state what it is. Have several tries and take the average. (Have your friend hold the ruler against the wall with a finger at the top of the hanging ruler.

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09_1090_hw7 - Physics 1090 Homework#7 Due Thursday October...

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