P114-Morning –Summer’08

Extra Credit #3

Due Aug 5, 2008

Team #____________

Member #1_____________________

Member #2_____________________

Member #3_____________________

Member #4_____________________

-Only members with their names on this cover sheet will receive credits.

-Collaborations between team members are encouraged; however one or two authors will be responsible for one problem and may be asked to explain it.

-The authors should present the solution on a blank sheet with their names on it. Submissions from a same team should be stapled together

-Solutions should include “self-explained” diagrams/sketches, with minimal wording. Neat presentation will count toward the problem grading.

1.- Capacitors: explain possible solutions if any to save space in batteries used to propel cars or even light planes.

2.- Circuits: is there any parallel between electrical current and water flow? Is it possible to draw an equivalent circuit for the circulatory system in our body, can you draw one with as much details as you can?

3.- Magnetic force: describe in technical details how magnetic levitation works. Give an estimate using the equations given in class on how large a magnetic field and or current are needed to levitate a train.