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Static and Kinetic Friction vs Normal Reaction Graphing

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How do i suppose to determine the uncertainty for the slope of my Static friction against normal reaction graph?
My data for static friction and normal force has the uncertainty of +/- 0.0001
The uncertainty is too small for me to draw airbox/bar in the graph to draw the max and min slope....

Static and Kinetic Friction vs Normal Reaction Graphing

Lagrange Multipliers inconsistent system

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1. The problem statement, all variables and given/known data
maximize f(a,d,h,p)= (4a+3d+3h+c1)c2 *(2+0.01*floor(50+0.0001p)) subject to the constraint 1439a+427d+9259+912/5*h=k.
This is not a hw problem but it may as well be: it comes from a game, the function f represents damage as a...

Lagrange Multipliers inconsistent system

Laminar flow in tube heat transfer coefficient-sanity check

Munkres-Analysis on Manifolds: Extended Integrals

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I am studying Analysis on Manifolds by Munkres. He introduces improper/extended integrals over open set the following way: Let A be an open set in R^n; let f : A -> R be a continuous function. If f is non-negative on A, we define the (extended) integral of f over A, as the supremum of all the...

Munkres-Analysis on Manifolds: Extended Integrals

Continuous output: logistic vs linear regression

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so say I suspect that there is a positive trend in the data from the scatter plot. Say the output y is continuous.

A linear regression would give me a possitive estimate of the slope. For a one unit increase in x, I would get a so and so increase in y.

I can also split the data for the y...

Continuous output: logistic vs linear regression

Question about Many Worlds branching in Quantum Mechanics

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Supposing the Many Worlds interpretation of QM is true... If a branching occurs during what we perceive is a wave function collapse, why would this be perceptible to us as probabilties? Wouldn't we just branch, leaving it just as imperceviable as the passage of time? That is, it just...

Question about Many Worlds branching in Quantum Mechanics

Is the math for collapse int different than for mwi?

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Because I understand that for unitary evolution, MWI is required, which suggests that for different interpretations, there may not be unitary evolution?

PF Photo Contest - Chocolates (8/4-8/10)

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Chocolates

While it is toxic to most dogs, we human loves chocolates (or at least, I do). This week's contest is all on chocolates. It can be a chocolate cake, a chocolate candy or bar, a hot cocoa, a chocolate truffle. It can even be a cocoa plant, cocoa...

PF Photo Contest - Chocolates (8/4-8/10)

EoM via varying action - covariant derivative when integrate

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##\int d^4 x \sqrt {g} ... ##

if I am given an action like this , were the ##\sqrt{\pm g} ## , sign depending on the signature , is to keep the integral factor invariant, when finding an eom via variation of calculus, often one needs to integrate by parts. When you integrate by parts, with...

EoM via varying action - covariant derivative when integrate

A cure for gray hair is on the way?

Eta Carinae Is Farther Than You Thought: 8,500 Light-Years

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That also means it's 25-30% more luminous than previously thought. The new work is based on Gaia parallaxes of stars associated with Eta Carinae: more here.

Why 'vd ∝ d' in Pv = nRT?

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1. The problem statement, all variables and given/known data
Why 'vd ∝ d' in Pv = nRT? Should it be 'vd ∝ d⁄2'? (where vd = vapour density)

2. Relevant equations


3. The attempt at a solution
As we know Pv = nRT, PM = dRT, PM / 2 = dRT / 2, M / 2 = d / 2, vd ∝ d (as given...

Why 'vd ∝ d' in Pv = nRT?

Amateur Dev Q: Creating Front End for SQL Server DB

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Hi All,
I am kind of new to this, please be patient. I appreciate your input
I have a SQL Server DB, I am trying to create a remote front end to give graphical, or at least simple access
to the DB (Client-Server, of course).
I would appreciate some suggestions. This is my way of breaking...

Amateur Dev Q: Creating Front End for SQL Server DB

CMBR anisotropy and cosmic abundances

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What is (are) the original paper(s) relating to the interpretation of the CMBR anisotropy in setting the cosmic abundances? I did pose the same question last year but it got lost in another thread. I had found papers by Hu and Dodelson from 2002, Hu and white from 1996 and Seljak from 1994 as...

CMBR anisotropy and cosmic abundances

Primate Brains Query

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Hi

According to Wikipedia, there are approximately 140 trillion synapses in an average human adult brain. So I would be interested to know how this number compares with the number of synapses in a chimp's brain.

Many thanks.

Frequency spectrum of phase shift

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What does a 180 degree phase shift of a sinusoidal in a signal do to the frequency spectrum of the signal?

Respect or Love?

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If you had to choose between one, which one would you choose and why?

Also, this question is not necessarily for romantic relationships, but also regarding friends and colleagues etc. So for example, being well liked vs being well respected.

Analyzing a circuit with 1 point earthed

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1. The problem statement, all variables and given/known data
Find potential of A and B in the given figure. (pardon poor quality, I only have a webcam)

2. Relevant equations
All related

3. The attempt at a solution
marking 1 to 4 from left to right. C1,C2,C3 are in series....

Analyzing a circuit with 1 point earthed

General formula for a sequence of numbers

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Hi there. I am working with a problem where a sequence of numbers arises. This sequence reads: ##\{0,1,3,5,10,15,21,28\}## as far as I have worked it. I am trying to figure out the underlying relation that gives this sequence. These are related to indexes in a matrix, and I am trying to...

General formula for a sequence of numbers

A question of invariable mass.

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A question of invariable mass.

In a inertial system, the invariable mass of a system never change with time. This system may not be an isolated system.

Whether in any inertial system, the invariant mass of the system remains unchanged.


Or, in a certain inertial system, what is the necessary...

A question of invariable mass.
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