course phy 121
3/21 at 8:30 p.m.
Asst 20 Question 1--------------------------------------------------------------------------------
As on all forms, be sure you have your data backed up in another document, and in your lab notebook.
--------------------------------------------------------------------------------
The situation here is similar to that depicted above, though the distances of the rubber bands from the center are different. The die on which the strap rotates is not visible,
but is attached to the tabletop; the blue push pin constrains the system to rotate about a vertical axis through the center of the die.
The problem:
The metal strap used in the Angular Velocity of a Strap experiment is constrained by a vertical push pin to rotate about a hole in a die. The die is glued in place to a massive
tabletop. A rubber band is attached to a point 15 cm from the axis and stretched so that it exerts a force of 3 Newtons, directed perpendicular to the rod. If this force is
unopposed it will accelerate the system rapidly. You want to attach a second rubber band 5 cm from the axis to prevent the system from rotating.
How much force will that rubber band have to exert?
answer/question/discussion:
I assume that it will also need to be 3 N to counteract the force given.
#$&*
Once both of these forces are in place and the system is stationary, what (if anything) will happen if the glue holding the die to the tabletop comes loose?
answer/question/discussion:
There should not be any movement if the system is set up correctly.
#$&*
--------------------------------------------------------------------------------
Copy and paste your work into the box below and submit as indicated:
Your instructor is trying to gauge the typical time spent by students on these questions. Please answer the following question as accurately as you can, understanding that your
answer will be used only for the stated purpose and has no bearing on your grades:
Approximately how much time did you spend on this question?
5 min.
You may add optional comments and/or questions in the box below.
--------------------------------------------------------------------------------
Author information goes here.
Copyright © 1999 [OrganizationName]. All rights reserved.
Revised: 06 Feb 2010 17:14:30 -0500"
&#Please compare your solutions with the expanded discussion at the link
Solution
Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified. &#