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phantomvommand's latest activity
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phantomvommand
replied to the thread
Tension in a deformed cylindrical bag on a surface
.
@Chestermiller yep, I meant px as a product Your equation is correct, though of course under a different definition of theta.
Today, 6:03 AM
P
phantomvommand
reacted to
haruspex's post
in the thread
Tension in a deformed cylindrical bag on a surface
with
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I think @phantomvommand intended p(x) to indicate a product, not a function.
Today, 6:02 AM
P
phantomvommand
replied to the thread
Tension in a deformed cylindrical bag on a surface
.
Yes, p is uniform. but I do not see how the equations can be reduced to the text’s solution.
Today, 5:58 AM
P
phantomvommand
replied to the thread
Tension in a deformed cylindrical bag on a surface
.
This has to do with your definition of ##\theta##. I defined ##\theta## to be the angle swept out from the bottom of the cylinder, so...
Today, 5:55 AM
P
phantomvommand
replied to the thread
Tension in a deformed cylindrical bag on a surface
.
##\theta## is the angle swept out from the base of the cylinder to the fabric at height x. Under my definition of ##\theta##, ##\theta##...
Today, 2:21 AM
P
phantomvommand
reacted to
haruspex's post
in the thread
Contact Mechanics: Deformation of a ball on a surface
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At height r above the flat base, the radius is ##\sqrt{2r\sqrt{R^2-r^2}}## (check my algebra). If r<<R that's about ##\sqrt{2Rr}##...
Today, 1:57 AM
P
phantomvommand
reacted to
haruspex's post
in the thread
Contact Mechanics: Deformation of a ball on a surface
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It is not that there is anything magic about the height being less than or more than r. At the base, the force is spread over area ##\pi...
Today, 1:57 AM
P
phantomvommand
posted the thread
Tension in a deformed cylindrical bag on a surface
in
Introductory Physics Homework Help
.
A cylindrical bag is made from a freely deformable fabric, impermeable for air, which has surface mass density σ; its perimeter L is...
Yesterday, 10:28 PM
P
phantomvommand
replied to the thread
Contact Mechanics: Deformation of a ball on a surface
.
But how does ##\sqrt {2Rr} >> r## mean that pressures at heights above r will be smaller? Sorry, I wasnt clear about my final question...
Yesterday, 7:37 PM
P
phantomvommand
posted the thread
Contact Mechanics: Deformation of a ball on a surface
in
Introductory Physics Homework Help
.
A solid ball of radius R, density ρ, and Young’s modulus Y rests on a hard table. Because of its weight, it deforms slightly, so that...
Yesterday, 12:40 PM
P
phantomvommand
replied to the thread
Stress on a spaghetti rod balanced from its middle
.
I see, then the ratio of tensile to shear stress in the spaghetti rod would far exceed 2:1 (generally), since ##l >> d##. However...
Saturday, 2:09 PM
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phantomvommand
replied to the thread
Stress on a spaghetti rod balanced from its middle
.
Are both tensile and shear strength not fixed values for a particular material? My view is that while horizontal stress is indeed...
Saturday, 6:47 AM
P
phantomvommand
posted the thread
Stress on a spaghetti rod balanced from its middle
in
Classical Physics
.
Wednesday, 10:02 PM
P
phantomvommand
posted the thread
Stress on a spaghetti rod balanced from its middle
in
Introductory Physics Homework Help
.
TL;DR Summary: A thin piece of spaghetti of diameter d is balanced horizontally from its middle. It can have a length ℓ ≫ d before it...
Wednesday, 10:02 PM
P
phantomvommand
reacted to
haruspex's post
in the thread
Shape of Slinky being twirled in 0 gravity
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Like
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That's not how I would put it. The coordinate axes can stay where they are; the spring rotates as though rigid about the x axis.
Wednesday, 9:51 PM
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