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Question 1

-6votes

0answers

111views

Is the measured value of G a true constant, or an average affected by internal structure and attenuation? [closed]

The gravitational constant G has been measured in various experiments since Cavendish, but nearly all assume that macroscopic bodies (like test masses or the Earth) act as uniform sources of gravity. ...

demon1101

1

askedNov 23 at 10:35

Question 2

-2votes

1answer

70views

Confused with Vernier Calipers [closed]

I've been lied to about the correct method to read vernier calipers by my teacher. And I realised it 10 years later when I myself become a teacher!Sorry, for the rant, but I have to make sure, which ...

user516076

97

askedNov 14 at 1:54

Question 3

7votes

3answers

844views

How should you handle uncertainties of when determining mean count rates of radioactive sources?

When taking count rate measurements, I get a mean of 572.41 #/s. I have taken one measurement per second, totalling 596 measurements. After consulting Glenn F. Knoll's Radiation Detection & ...

leng

71

askedNov 4 at 16:53

Question 4

6votes

3answers

1kviews

Is there any general principle for why small deviations in models give only small errors in predictions?

I have a question regarding the pragmatic heuristic that goes something along the lines of"Small deviations from reality in a model yield small errors in the predictions of the model"Is ...

Anna

1,253

askedNov 3 at 23:32

Question 5

0votes

1answer

132views

Scientific notation with/vs. complete integers

I got into a fight on the zsh forum over the fact that zsh uses '5.' to indicate the integer 5 but stored as a floating point number. I protested that '5.0' would be better since the trailing dot is ...

Ray Andrews

161

askedOct 10 at 20:36

Question 6

0votes

0answers

60views

What are the main sources of systematic uncertainty in $Δα/α$ measurements from quasar absorption lines?

Studies like Webb et al. (2011) and King et al. (2012) have reported small deviations in the fine-structure constant, α, using quasar absorption spectra at high redshifts. These rely on precise ...

Anushka_Grace

903

askedOct 7 at 22:06

Question 7

0votes

0answers

79views

How can I determine the error for assuming earth is and using Cartesian coordinate system

While I was reading through HRK came across this problemat the last picture it's asking"Can you estimate the distance d that the airplane must fly before the use of flat Cartesian coordinates ...

DAZ Apon

1

askedOct 7 at 13:21

Question 8

1vote

1answer

156views

Does this spring work with Hooke's law or not? [closed]

In the table is the data from the spring. In the y axis is the force in Newtons, and in the x axis is the extension in meters.Edit: I found out the reason why this spring did not work as initially ...

maneman

11

askedOct 6 at 10:58

Question 9

12votes

6answers

1kviews

Statistics for Theoreticians

I'm a theoretician, and as the years pass, I notice my knowledge of statistics and my memories of experimental physics classes fading and becoming more and more uncertain. Thus, I'd like to ask for ...

Community wiki

Níck

Question 10

3votes

1answer

282views

Is it okay if your signal and noise have the same statistical distribution?

Please bear with me if this seems like a very basic question. Let's say you want to detect a signal by measuring a variable $x\in[0,\infty)$. Let's say you know the variable $x$ follows a probability ...

UrsaCalli79

673

askedAug 27 at 16:07

Question 11

0votes

0answers

103views

Questions about calculations of significant figures

Essential Physics 4/e by Richard Wolfson states this:In addition and subtraction, the answer should have the same number of digits to the right of the decimal point as the term in the sum or ...

Carol Huang

1

askedAug 23 at 12:39

Question 12

3votes

3answers

739views

To what extent can we trust a measurement and its uncertainty?/Is there a rigorous framework for measurement?

The underlying driving question here is really just "How do I trust a measurement?"Ultimately, I'd like an answer(s) that applies to any measuring device (be it a voltmeter, telescope data, ...

Artyom Elessar

55

askedAug 7 at 4:41

Question 13

-1votes

2answers

160views

Triangulation, how, by drawing triangles schemes, does one control the error of the measurements? [closed]

I am trying to understand triangulation, especially I am focused on the triangulation Méchain and Delambre achieved in the end of the 18th century, in order to measure the distance between Dunkirk and ...

niobium

754

askedJul 30 at 10:40

Question 14

1vote

7answers

1kviews

Length of an object

Usually, when we measure the length of an object in reality, we determine the end point and measure it. But if you look at the boundary between the object and the vacuum, you can't know exactly how ...

최현수

35

askedJul 2 at 5:52

Question 15

1vote

0answers

120views

Numerically marginalizing over a parameter

I am working with gravitational waves data. I have done a Bayesian parameter estimation using dynamic nested sampling. So I have posterior distributions for several parameters. Now I want to ...

abcdefgh

61

askedJun 17 at 9:24

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Stack Exchange Network

Questions tagged [error-analysis]

Is the measured value of G a true constant, or an average affected by internal structure and attenuation? [closed]

Confused with Vernier Calipers [closed]

How should you handle uncertainties of when determining mean count rates of radioactive sources?

Is there any general principle for why small deviations in models give only small errors in predictions?

Scientific notation with/vs. complete integers

What are the main sources of systematic uncertainty in $Δα/α$ measurements from quasar absorption lines?

How can I determine the error for assuming earth is and using Cartesian coordinate system

Does this spring work with Hooke's law or not? [closed]

Statistics for Theoreticians

Is it okay if your signal and noise have the same statistical distribution?

Questions about calculations of significant figures

To what extent can we trust a measurement and its uncertainty?/Is there a rigorous framework for measurement?

Triangulation, how, by drawing triangles schemes, does one control the error of the measurements? [closed]

Length of an object

Numerically marginalizing over a parameter

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