Physics Problem: Rotating Chair
A physics student is sitting on a frictionless platform that is rotating with an angular speed of ωi = 3.2 rad/s. His arms are outstretched, and he is holding a heavy weight in each hand. The moment of inertia of the student, the extended weights, and the platform about the rotation axis is Ii = 11.5 kg·m2. When the student pulls the weights inward toward his body, the moment of inertia decreases to If = 6.4 kg·m2.

What is the resulting angular speed, ωf, of the platform?

By how much is the kinetic energy of the system increased? (Think about where this increase in energy comes from!)

recitation problems.... anyone problem 16?

Does anyone know how to do problem 22 for recitation?

Lon Capa Set 2
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Hey guys! Good luck with set 2!

Lon Capa Set 1
Mood:  chillin'
Hey guys! Just thought we could start on this first lon capa set! Post if you have any questions! I hope we all have a great semester!

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Sum of Vectors Part B:

inverse tan(theta) = Rx/Ry

 

Car Accident Part B:

 

a = [(velocity after)^2 - (velocity before)^2]/2D

 

velocity after would be the square root of 2ax

velocity before would be the answer to part a

can someone help me with the catapult the solution given isnt working... could someone rephrase it or something

 

thanks in advanced

ESSENTIAL CAPA
Mood:  party time!
We need to start studying for the final!!! So lets get started posting how to help do some of these review capa problems

Assignment 13 Vibrations
Hey just starting this for anyone with questions for this section!!

ANYTHING ON FLUIDS?
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I can help with conceptual, but thats the only one i got so far......Thanks