# Force and centripetal motion

1. Sep 29, 2016

### Jrlinton

1. The problem statement, all variables and given/known data

https://www.physicsforums.com/attachments/bolt-png.106701/ [Broken]
2. Relevant equations
F=ma
v=d/t
centripetal accel=v^2/r
basic circle formulas

3. The attempt at a solution
Firstly to figure the rot/sec of the rod
2040/8= 255 rotations per second
Then multiplying the 255 rotations by the circumference of the bolt to find the velocity
2pi(.036m)= .226 m
.226*255=57.63 m/s
Using the centripetal acceleration formula to find acceleration
57.63^2/.226= 14695.65 m/s/s
Using F=ma
F=.032kg(14695.65 m/s/s)
F=470.26 N

Last edited by a moderator: May 8, 2017
2. Sep 29, 2016

### Jrlinton

Yeah I divided by the circumference instead of the radius in the acceleration formula. I guess I need to be more organized in my work.
57.68^2/.036=92416.18
F=92416.18(.032)=2957.32