Area moment of intertia of a t-bar

AI Thread Summary
The discussion revolves around calculating the area moment of inertia for a T-bar section about a specified axis. The initial attempt at a solution involves using the parallel axis theorem and includes terms for the dimensions of the T-bar. There is confusion regarding the correctness of the provided formula, which combines three components. Participants suggest simplifying the equation by collecting similar terms but seek clarification on the official answer. The conversation highlights the importance of understanding the application of the parallel axis theorem in structural analysis.
NoobeAtPhysics
Messages
75
Reaction score
0

Homework Statement



The area moment of inertia about the dashed axis is what?

momin1.5.gif


Homework Equations



Paralell Axis theorem

The Attempt at a Solution



(1/12)bh³ + (1/12)hb³ + bh(h/2 + b/2)²

I don't understand how I am wrong
 
Last edited:
Physics news on Phys.org
NoobeAtPhysics said:
(1/12)bh³ + (1/12)hb³ + bh(h/2 + b/2)²
Looks right to me, though you could collect up some similar terms. What is the official answer?
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Moment of Inertia: Thin Spherical Shell
Replies
27
Views
4K
How to Calculate the Moment of Inertia for a Rod and Sphere System?
Replies
8
Views
2K
Why Use Area Instead of Mass in Moment of Inertia Formula?
Replies
7
Views
2K
Correct Use of the Parallel Axis Theorem for Moment of Inertia
Replies
2
Views
2K
Moment of Inertia - Find Area Around Y-Axis
Replies
1
Views
2K
Moment of inertia of a cuboid parallel to one of its faces (repost with diagram)
Replies
25
Views
2K
Hinged Water Storage Tank -- Calculate the force on one side
Replies
15
Views
3K
What is the total moment of inertia using the negative area method?
Replies
3
Views
1K
Max ω of circular hoop rotating around a peg and oscillation
Replies
1
Views
2K
Moment of inertia of a disk about an axis not passing through its CoM
Replies
11
Views
3K

Hot Threads

Recent Insights

Back
Top