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dcmf's latest activity
dcmf
reacted to
haruspex's post
in the thread
Compare rotational inertia of 2 paper cups in 2 diff orientations
with
Like
.
Not sure how you get that from symmetry. Another principle is additivity: if a body is considered as a rigid combination of two bodies...
Mar 24, 2024
dcmf
reacted to
erobz's post
in the thread
Compare rotational inertia of 2 paper cups in 2 diff orientations
with
Like
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I too think they should have exaggerated the dimensions a bit if they meant for it to be objective. For the record my instincts for the...
Mar 24, 2024
dcmf
reacted to
haruspex's post
in the thread
Compare rotational inertia of 2 paper cups in 2 diff orientations
with
Like
.
Having done the algebra, if the end radii are ##R_1, R_2## and the length (cup height) is L then ##I_1=I_2## (or ##I_3=I_4##) when...
Mar 24, 2024
dcmf
reacted to
erobz's post
in the thread
Compare rotational inertia of 2 paper cups in 2 diff orientations
with
Like
.
Did you check to see how plausible these dimensions are from the picture?
Mar 24, 2024
dcmf
replied to the thread
Compare rotational inertia of 2 paper cups in 2 diff orientations
.
Hi all, I really appreciate the insight. I think I'm still having a little trouble grasping the rationale behind the ranking but I think...
Mar 24, 2024
dcmf
replied to the thread
Compare rotational inertia of 2 paper cups in 2 diff orientations
.
I feel like I have considered both, though. Point 1 suggests that I1 = I3 due to the placement of the axes. Point 2 suggests that I2 >...
Mar 24, 2024
dcmf
replied to the thread
Compare rotational inertia of 2 paper cups in 2 diff orientations
.
I fully agree. I do not plan to compute any of these inertias. However, I'm pretty sure I need to use the inertia equations to compare...
Mar 24, 2024
dcmf
posted the thread
Compare rotational inertia of 2 paper cups in 2 diff orientations
in
Introductory Physics Homework Help
.
Figure 1: I assume this is a conceptual question regarding the usage of the above inertia equations but the axes are really confusing...
Mar 24, 2024
dcmf
reacted to
haruspex's post
in the thread
Avg Power in a Rotational Energy/Work Problem
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How would you define that? What is the definition of average power? You wrote ##P_{avg}=W/\Delta t##, which is correct if you define...
Mar 23, 2024
dcmf
reacted to
kuruman's post
in the thread
Avg Power in a Rotational Energy/Work Problem
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I would set the work aside. You are asked to find the average power over time. The time average of a function ##f(t)## over an...
Mar 23, 2024
dcmf
replied to the thread
Avg Power in a Rotational Energy/Work Problem
.
I just noticed that you may have updated your reply. Would it be appropriate to use the work as defined in the first part of the...
Mar 23, 2024
dcmf
replied to the thread
Avg Power in a Rotational Energy/Work Problem
.
In class, we actually did not address work or power in the context of problems involving rotation. This homework question seems to to be...
Mar 23, 2024
dcmf
posted the thread
Avg Power in a Rotational Energy/Work Problem
in
Introductory Physics Homework Help
.
This question has multiple parts and according to all the work done up to this point... How much work W does the motor do on the...
Mar 23, 2024
dcmf
replied to the thread
Torque question in Deltoid muscle
.
I had a really poorly done sketch so I omitted it 😳 The numbers didn't look right to me either though. But I just have terrible...
Mar 16, 2024
dcmf
replied to the thread
Torque question in Deltoid muscle
.
Thanks for the input. You're absolutely correct, there was a calculation error there but that results in about 985.2N, but I think the...
Mar 16, 2024
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