Finding the angular velocity of a pendulum

AI Thread Summary
The discussion revolves around calculating the angular velocity of a pendulum and identifying errors in the moment of inertia calculations. The user initially provided formulas for the moment of inertia of a sphere and a rod but expressed confusion over discrepancies with textbook values. After receiving prompts for clarification, the user recognized an error in the moment of inertia for the rod, realizing it should be calculated using the formula I_{rod} = \frac{1}{12}ML^2 + Md^2. This correction leads to a more accurate representation of the system's moment of inertia. Accurate calculations and the use of correct units are emphasized as crucial for resolving discrepancies.
I_Try_Math
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Homework Statement
A pendulum consists of a rod of length 2 m and mass 3 kg with a solid sphere of mass 1 kg and radius 0.3 m attached at one end. The axis of rotation is as shown below. What is the angular velocity of the pendulum at its lowest point if it is released from rest at an angle of 30 degrees?
Relevant Equations
## I_{sphere} = \frac{2}{5}MR^2 + Md^2 ##
## I_{rod} = \frac{1}{3}ML^2 + Md^2 ##
7-27-q.png


My answer disagrees with the textbook and I have a feeling it may be due to how I calculated the moment of inertia. Is there anything obviously wrong with my calculation? Any help is appreciated.

## I_{sphere} = \frac{2}{5}MR^2 + Md^2 ##
## I_{rod} = \frac{1}{3}ML^2 + Md^2 ##

## I_{sphere} = \frac{2}{5}(1)(0.3)^2 + (1)(0.3)^2 = 0.126 ##
## I_{rod} = \frac{1}{3}(3)(2)^2 + 3(0.6)^2 = 5.08 ##

## I = I_{sphere} + I_{rod} = 5.21 ##
 
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I_Try_Math said:
## I_{rod} = \frac{1}{3}ML^2 + Md^2 ##
## I_{rod} = \frac{1}{3}(3)(2)^2 + 3(0.6)^2 = 5.08 ##
Why?
What is the equation for the parallel axis theorem?
What is ##I_{\text{cm}}## for the rod?
What is the distance of the CM of the rod from the axis of rotation?
Also, if you put numbers down remember to include the appropriate units.
 
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kuruman said:
Why?
What is the equation for the parallel axis theorem?
What is ##I_{\text{cm}}## for the rod?
What is the distance of the CM of the rod from the axis of rotation?
Also, if you put numbers down remember to include the appropriate units.
Ah I think I see where I was going wrong. I believe this should be the correct moment of inertia for the rod.
## I_{rod} = \frac{1}{12}ML^2 + Md^2 ##
## I_{rod} = \frac{1}{12}(3 kg)(2 m)^2 + (3 kg)(1.6 m)^2 ##
 
That looks fine.
 
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