
Before posting anything, please review the Physics Forums Global Guidelines.
Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
48,208 
The question is to calculate: q, w, ∆U, ∆H, ∆S for each step(A to B, B to C, C to A)
I know how to calculate the...

Apr2212 07:19 AM
Psi^2

2 
1,308 
What happens when we send in a vacuum pulsed electron beam with a frequency 1e9Hz and power 1e6MeV?
Thanks.

Apr2212 06:12 AM
mfb

3 
727 
Is cycle the same as wavelength?
Thanks!

Apr2212 03:48 AM
Bobbywhy

1 
1,495 
Alright guys, just looking for a point in the right direction for a tutorial question.
GIVEN VALUES:
Temperature...

Apr2212 03:06 AM
Blem

2 
1,719 
Hello,
In electrostatics, classical mechanics predicts that a charged particle's actionatadistance force...

Apr2112 11:14 PM
Philalethes

5 
977 
I am really not all that intelligent and fairly new to the whole mathematical equation solving thing. So please bare...

Apr2112 06:34 PM
pbody

4 
881 
In one of my homework problems (This ISNT a homework help question! It is conceptual) It says to find the "effective"...

Apr2112 04:13 PM
Vanadium 50

5 
2,618 
I was curious, why is energy conserved in elastic collision but not in perfectly inelastic collision? It said this in...

Apr2112 02:54 PM
Woopydalan

5 
1,258 
If an axle is being pulled with a tractive effort E, can this be resolved into a couple and forwards force E at the...

Apr2112 02:04 PM
Eugbug

2 
1,050 
Anyone can explain why there is axial stress in cylindrical thin walled vessels? I know that there is circumferential...

Apr2112 09:52 AM
jayman16

0 
740 
I'm having trouble trying to understand what a volt is, and I thought this question might be able to help me...

Apr2112 09:37 AM
mfb

4 
1,943 
Is there any mathematical relation between the value of charge(ie proton/electron) and radiation which is being...

Apr2012 09:35 PM
Bob S

6 
1,163 
Earth ground believed to be good electrical yet poor thermal conductor.
Is it possible to use in some thermoelectric...

Apr2012 02:31 PM
Stanley514

0 
748 
can anyone help me in figuring out why i got different answers in my calculated value to my experiment value (or maybe...

Apr2012 11:34 AM
uknew

3 
856 
A wire of radius one meter is centered on the origin in the xy plane. This wire carries a
total charge of +Q. Another...

Apr2012 09:14 AM
jubin

0 
857 
Is paint a conductor of electricity? Since we charge the paint and let it move to the metal body of a grounded car so...

Apr2012 04:08 AM
sgstudent

2 
2,499 
Perrin got his nobel prize because of his experiment on brownian motion, which is thought to have proven the existence...

Apr1912 11:36 PM
josh1492

7 
3,295 
I'm a compsci guy reading Feynmann's lectures leisurely. I find the retardedfield equations somewhat shocking due to...

Apr1912 05:14 PM
isthisrealife

0 
721 
Hi,
I need to compute the inverse of the moment of inertia (MOI) tensor of a bunch of point particles in a simulation...

Apr1912 05:11 PM
danbolin

8 
1,895 
When picturing electric fields, they are always based on a positive test charge. As you move on to potential...

Apr1912 04:15 PM
chrisbaird

3 
1,331 
I had a thought that I hope you could give me feedback on:
Imagine a complex configuration that had a steady...

Apr1912 07:28 AM
mfb

1 
699 
This is how Wikipedia summarizes the Poincaré Recurrence Theorem:
This is wrong, isn't it? Don't you need to...

Apr1812 10:52 PM
haruspex

1 
1,076 
Hello everyone,
How are you doing?
I have a doubt about electromagnetic induction, in three particular cases. I...

Apr1812 07:11 PM
marcusl

5 
1,511 
If there is already a post/thread for this topic, i apologize, and please link me to it, if you'd be so kind.
I...

Apr1812 06:51 PM
beach_waddell

16 
2,976 
For a given pinhole size in a camera, and camera size, what would be the optimal pixel size to get the maximum...

Apr1812 06:06 PM
Khashishi

2 
1,183 
I would like to know if the transmission delay of pressure give a differential force on an object ? Example: an object...

Apr1812 11:48 AM
boneh3ad

4 
991 
Hi I want to make sure my intuition is correct about the buoyant force.
What I am confused by if we take a cube or...

Apr1812 05:25 AM
Genericcoder

4 
776 
Right now I have Schroeder, and I'm not a fan of it, despite some of the rave reviews I have read. I'm thinking I need...

Apr1812 04:52 AM
cragar

4 
1,307 
With a standard bolt and nut. Create 2 areas, red and green, red surface = green surface. Green surface is closer to...

Apr1812 04:49 AM
Hassan2

5 
1,141 
Hi guys,
I have been selfstudying physics since sometime Its been going great,but I was reading yesterday on...

Apr1812 04:49 AM
Genericcoder

2 
1,061 
Hi all, I'm a total NEWB to this forum, so Hi!
I need help deciding which laser to go with, and choosing optics...

Apr1812 02:12 AM
nmz787

0 
1,287 
Hi everybody
I have been trying to develop an intuitive general understanding of how the trajectory of an object ,...

Apr1812 01:36 AM
haruspex

1 
780 
i see G is calculated with g,or assumed to be the same,just other value,for all planets,stars,etc,variable being just...

Apr1812 01:13 AM
Vanadium 50

13 
1,353 
I know Dirac had said yes to existence of microscopic monopole by quantum theory, so why not the macroscopic monopole?

Apr1712 11:43 PM
liumylife

2 
976 
1. what is the importance (practical use) of moment diagram by parts?
2. Is it just another method of drawing the...

Apr1712 09:59 PM
jnlbctln

0 
1,033 
I am a bit confused by the definition of an isentropic process in the flow of an ideal gas.
isentropic implies...

Apr1712 05:37 PM
citrouille

4 
1,722 
How do I show that our equations for the E and Bfields for the oscillating electric dipole do NOT satisfy Maxwell’s...

Apr1712 03:57 PM
DrDu

5 
1,635 
So there is a daredevil named "Professor Splash" who is known for diving (belly flopping) from over 30 feet into a...

Apr1712 03:01 PM
DaveC426913

7 
2,117 
Suppose a closed loop with constant current around the loop. The loop is in a uniform constant B field. The force is ...

Apr1712 02:41 PM
yungman

8 
896 
an average one,not big or poney...

Apr1712 12:26 PM
chrisbaird

8 
1,179 