Charged particle acceleration across a potential

October 15, 2018, 5:51 pm

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Hello,
I haven't been able to find the answer to this anywhere.

When calculating the energy gained by a particle that is accelerated across the gap of two cavities (e.g. Dees in a cyclotron, or charged cylindrical cavities of a linear accelerator), does one need to take into account the size of...

Charged particle acceleration across a potential

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How to find distance when a ball rolls slope with angle?

October 15, 2018, 5:52 pm

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1. The problem statement, all variables and given/known data
A) For a steel ball rolling down a 35 degree slope from a height of .5 m above the table, how far will the ball travel in the x direction if it launches horizontally from the table which is 1m high

For the same ball rolling...

How to find distance when a ball rolls slope with angle?

Find angle of ladder equation

October 15, 2018, 5:53 pm

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1. The problem statement, all variables and given/known data
A 75 kg man stands on a 8meter 25kg ladder at 6 meters above the bottom when it just starts to slip. Mu(s) is.3. What is the angle of the ladder?

ladder mass=25kg
ladder length=8m
man mass= 75kg
radius of man slipping = 6m...

Find angle of ladder equation

Hello, new member here

October 15, 2018, 5:57 pm

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Hi everyone,
I'm excited to find this forum. I work in architecture, but in my personal life I'm very interested in physics and engineering--specifically particle physics, waves, fields (elect./magnetic/gravity), and nuclear fusion. I have been involved at times on the amateur fusion...

Hello, new member here

The Conscious Observer

October 15, 2018, 6:05 pm

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How exactly does the mere act of observing collapse the wave function of, say, photons? I don't quite understand that one. And Richard Feynman's question related to Young's double slit experiment and the fact the electron went through both slits, as well as neither, and just one slit, and just...

The Conscious Observer

Vertical Circle (Circular Motion)

October 15, 2018, 6:57 pm

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1. The problem statement, all variables and given/known data
You swing a 1.60m long string with a metal ball attached to its end in a vertical circle, such that the speed of the ball does not change but the rope is always taut. The tension in the string when the ball is at the bottom of...

Vertical Circle (Circular Motion)

Insect, arthropod, and insectivore population crash

October 15, 2018, 7:01 pm

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Popular science version: (Let me know if the link has problems)
https://www.washingtonpost.com/scie...s-massive-insect-loss/?utm_term=.f9b8006df72b

Long term sampling from the 1970's to 2017/2018 shows losses of insect, arthropod, and insectivore...

Insect, arthropod, and insectivore population crash

Submerged Structures in an Ocean World

October 15, 2018, 7:10 pm

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Suppose that there exists a rotating water planet, i.e. a planet with a fairly deep ocean, which contains a large structure of a particular geometry submerged within the ocean. If this structure was assembled within the ocean will it, once it reaches a steady state, rotate at the same rate...

Submerged Structures in an Ocean World

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Quotienting out by M

October 15, 2018, 7:19 pm

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If ##N \trianglelefteq H ##, ##N \trianglelefteq G ##, and ##H \le G##, then is it true that ##H/N \le G/N##?

I want to use the result for a proof I am currently doing, but I am not sure it is true.
Is it enough just to note that if ##h_1,h_2\in H##, then ##(h_1N)(h_2^{-1}N) = h_2h_2^{-1}N \in...

Quotienting out by M

Can anyone help me to do ? thermochemistry

October 15, 2018, 7:26 pm

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1. The problem statement, all variables and given/known data
area=2.25
p1=1bar
v1=0.23m3
p2=
v2=1m3

2. Relevant equations
Isothermal process W=nrt ln(v2/v1)
W=F*D

3. The attempt at a solution
I got the workdone then sub into the equation of isothermal process. i couldnt...

Can anyone help me to do ? thermochemistry

Lorentz invariance and equation of motion for a scalar field

October 15, 2018, 7:41 pm

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Hi there,

I just saw some lectures where they claim that the Klein Gordon equation is the lowest order equation which is Lorentz invariant for a scalar field.
But I could easily come up with a Lorentz invariant equation that is first order, e.g.
$$
(M^\mu\partial_\mu + m^2)\phi=0
$$
where M is...

Lorentz invariance and equation of motion for a scalar field

M6.3, 6.4 -- a double whammy E of New Caledonia

October 15, 2018, 7:52 pm

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M 6.3 - 170km ESE of Tadine, New Caledonia

M 6.4 - 167km E of Tadine, New Caledonia

and a bunch of aftershocks following shortly...

M6.3, 6.4 -- a double whammy E of New Caledonia

Infinity: The Limit Concept and Cantor Transfinites

October 15, 2018, 7:56 pm

≫ Next: How much energy will be released?

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Supposedly, infininity has been purged from mathematics. Both the infinitely small and the infinitely large have been replaced by the idea of a "limit."

For example, a series x0+x1+x3+... is not considered to be a literal infinite sum with infinite terms but only the limiting value of an...

Infinity: The Limit Concept and Cantor Transfinites

How much energy will be released?

October 16, 2018, 6:59 am

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1. The problem statement, all variables and given/known data
The enthalpy of neutralization for the reaction of a strong acid with a strong base is -56 kJ/mol of water produced. How much energy will be released when 195.0 mL of 0.400 M HCl is mixed with 155.5 mL of 0.500 M...

How much energy will be released?

New member

October 16, 2018, 7:02 am

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hi everyone i am new here. i am a student of graduation in physics.

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Colligative Properties

October 16, 2018, 7:04 am

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I am having a little trouble in understanding a few points of colligative properties. Any help will be appreciated.

First, let's consider RLVP. We know that addition of a non-volatile solute decreases the vapor pressure of a pure volatile solvent. However, I am getting confused between the...

Colligative Properties

Can anyone help me with this thermochemistry problem?

October 16, 2018, 7:12 am

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1. The problem statement, all variables and given/known data
area=2.25
p1=1bar
v1=0.23m3
p2=
v2=1m3

2. Relevant equations
Isothermal process W=nrt ln(v2/v1)
W=F*D

3. The attempt at a solution
I got the workdone then sub into the equation of isothermal process. i couldnt...

Can anyone help me with this thermochemistry problem?

RIP Paul G. Allen (65)

October 16, 2018, 7:24 am

≫ Next: General Irreducible Representation of Lorentz Group

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https://www.cnbc.com/2018/10/15/microsoft-co-founder-paul-allen-dies-of-cancer-at-age-65.html...

RIP Paul G. Allen (65)

General Irreducible Representation of Lorentz Group

October 16, 2018, 7:32 am

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This one may seem a bit long but essentially the problem reduces to some matrix calculations. You may skip the background if you're familiar with Lorentz representations.

1. The problem statement, all variables and given/known data

A Lorentz transformation can be represented by the...

General Irreducible Representation of Lorentz Group

Magnetic force direction on a positive and negative charges

October 16, 2018, 7:34 am

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1. The problem statement, all variables and given/known data
The question askes about the path of the electron. I need to know if I am doing it correctly whether it was asked for a proton or an electron.

2. Relevant equations
F=QV⊥Bsinθ

3. The attempt at a solution

I...

Magnetic force direction on a positive and negative charges