Physics 113 –2012
Due July 5, 2012
Team #______________
Member 1__________________
Member 2__________________
Member 3__________________
Rules:
-Collaboration
between team members is encouraged,
-The
authors should present the solution on a blank sheet with their names on it. Members
of a team should submit together. No credit awarded for separate submissions
-Solutions
should include “self-explained” diagrams/sketches, with minimal wording. Neat
presentation will count toward the problem grading.
1.-
Design a method to separate marbles from tennis balls by making use of rolling
motion and conservation laws.
2.-
Explain why a helicopter has two helices, what is each for. Explain how to
distinguish between a cooked and a raw egg, explain why (the eggs need to be at
all point on a flat surface without breaking).
3.-
Using conservation of angular momentum, by holding a bike wheel (mass m, radius
r) on a circular platform (free to rotate about its center, a disk of mass M
and radius R), describe a method to measure your mass using a stopwatch (a
funny balance!).