{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Quiz6%20key%202009F

# Quiz6%20key%202009F - Quiz#6 Key Biomechanics IPHY 4540 0.5...

This preview shows pages 1–2. Sign up to view the full content.

Quiz #6 Key Biomechanics IPHY 4540 0.5 points for each numerical answer, no partial credit, need to show units. Total = 4.0 1. A 60 kg sprinter is running a race on an unbanked circular track with a circumference of 200 m. At the start, she increases speed at a constant rate of 5 m/s 2 for 2 seconds. After two seconds, she maintains a constant speed for the duration of the race. a. How long does it take for her to run the 200 m? to solve for the time, you need to break the race into two time periods: one with a constant tangential acceleration of 5 m/s 2 (the first two seconds) and one with a constant tangential acceleration of 0 m/s 2 ( after two seconds have gone by). Find the distance traveled in the first 2 seconds: r = v i t + 0.5 at 2 = (0)(2) + 0.5(5)(2) 2 = 10 m After the first two seconds, the runner has (200 m - 10 m) = 190 m left to go. Find the tangential velocity after the 2 seconds of acceleration v 2 sec = v 0 sec + at = 0 + (5)(2) = 10 m/s Find the time to complete the remaining distance at this velocity r = v i t + 0.5 at 2 = (10)t + 0 = 190 m t = 19 s

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern