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

Apr2211 05:26 AM
ZapperZ

1 
47,843 
Suppose we consider a car moving on rough road in forward direction, wheels rotating clockwise.
Since wheels rotate...

Nov112 06:38 PM
sophiecentaur

5 
1,227 
Hi
I am doing a project on folded waveguides and I am reading some IEEE papers for literature review. I always...

Nov112 12:12 PM
shpongle

2 
606 
I am trying to self learn kinematics , but i don't understand a certain concept :
If a string hold a mass...

Nov112 10:12 AM
arildno

1 
977 
Can we define specific heat capacity for an adiabatic process ??
Would it always be zero since dQ is 0 for an...

Nov112 12:49 AM
Andrew Mason

2 
2,459 
Hi,
I am having some difficulty doing the integral
∫d^{3}v1d^{3}v2  \overline{v1}\overline{v2}, where...

Oct3112 11:11 PM
babylonia

4 
664 
So I have derived a formula for the range of projectile in a vacuum fired from an arbitrary height h from above the...

Oct3112 08:29 PM
FallenLeibniz

3 
751 
I have an incline A that is very steep reaching a vertical height of h and another one B which is less steep with the...

Oct3112 07:32 PM
haruspex

5 
1,365 
I would like to calculate the energy need for move in the black volume in gas (move in from r2 to r1), when gas is...

Oct3112 05:34 PM
lba

15 
2,754 
I recently read about the communication blackout during a spacecraft reentry.. The reason given was the high density...

Oct3112 10:02 AM
AJ Bentley

1 
801 
Hi everyone.
I am a programmer and I think some basic physics will help me to achieve something I wanted to do.
...

Oct3112 07:50 AM
cubud

5 
1,083 
If we try to treat a nonrelativistic point charge, what force do we need to accelerate it uniformly, when we take the...

Oct3112 07:09 AM
blgeo

5 
1,160 
If 3 spheres have equal masses and the stationary object is in a collision
with a sphere with linear momentum . p=...

Oct3112 06:15 AM
mikeph

6 
995 
I don't really understand how electromagnetic waves in wires are created. Sure you can see from the Maxwell equations...

Oct3112 03:08 AM
Qreeus

43 
3,226 
It is written that:
Another useful form of the equation of state of a real gas is:
Pv= A + B/v + C/v^{2} + ...
...

Oct3012 04:25 PM
M. next

3 
779 
http://en.wikipedia.org/wiki/Lorenz_gauge_condition
I know it's used to simplify the 2 partial differential...

Oct3012 03:57 PM
dextercioby

7 
2,398 
Hi there, I would like to know that if we have an leaning object supported by another object, both are supported by...

Oct3012 03:24 PM
tinytim

1 
1,470 
Classically a single particle will have 3 position coordinates and 3 momentum coordinates, and so it "exists" in a...

Oct3012 12:07 PM
Silversonic

2 
741 
When a plane wave for example is travelling from air>dielectric and we know the power flow of the incident and...

Oct3012 10:39 AM
xnoiz

0 
460 
From what I have read so far, the vapor pressure of a liquid is temperature dependent while it is independent of the...

Oct3012 08:24 AM
mfb

1 
961 
In case of a circularly polarized wave, is the poynting vector also circularly polarized?
If not what happens in...

Oct3012 08:17 AM
Qreeus

2 
807 
As a way to express the complex poynting is F = P + j2ω(Wm − We), whats the magnitude and the phase of it based on the...

Oct2912 08:27 PM
xnoiz

0 
440 
NVM, Wrong section.

Oct2912 11:49 AM
Torald

0 
481 
Please see the attached photo.
I am not sure how to proceed. I do not know Mi or M2, nor do I have enough...

Oct2912 09:09 AM
emKhairol

3 
1,189 
I love physics, but I find that I am ignorant about some of the more basic concepts, so forgive me if this question...

Oct2912 08:53 AM
jtbell

4 
968 
Hello,
I am having difficulty understanding the paragraph in my textbook explaining why no other engine can be more...

Oct2912 08:36 AM
jtbell

2 
988 
hi .. ...
i am entering a sumobot competition..weight limitation 1kg..dimensions 150mm*150mm...what is more important...

Oct2912 04:00 AM
rcgldr

4 
683 
Not sure if I am doing this correct and do not have answer available...
A heat pump takes on 30,000BTU/hr of heat and...

Oct2812 11:41 PM
Andrew Mason

1 
1,003 
I having a bit of trouble understanding Joos's treatment of virtual displacements. I am referring to pages 114 and...

Oct2812 05:01 PM
Hetware

4 
725 
Alright so I have a question on the work done with constant acceleration up a hill. I was working an example problem...

Oct2812 04:16 PM
Physics_5

2 
873 
Here's the textbook way of calculating the work done by an ideal gas in an isothermal case.
PV=nRT
P.dV=(nRT/V).dV...

Oct2812 12:03 PM
metalrose

3 
1,175 
So, I know that it has been sort of asked in other forms before, but they mostly deal with human beings and so I've...

Oct2812 11:38 AM
wagonseast

10 
1,601 
I am confused why the heat capacity at constant pressure can be different from the heat capacity at constant volume.
...

Oct2812 11:28 AM
Woopydalan

2 
919 
Hi,
It seems that there is no much examples of this particular case.
OK, we all know how to write the general...

Oct2812 11:06 AM
phys_student1

2 
1,135 
If we consider the kinetic energy of say a car like Nissan Leaf moving at its top speed we have :
K.E. = 0.5 x M x...

Oct2812 10:45 AM
Jay_

13 
1,923 
Hello
Please, if you UNDERSTAND WHAT IS MOMENTUM, tell me.
I want to know, why do I need momentum, why was this...

Oct2812 09:11 AM
MaisaraWD

5 
676 
I understand that if two points are inside a conductor they're at the same potential. I also understand that if two...

Oct2812 08:16 AM
andrien

2 
508 
When we consider a magnet, usually we perceive the field lines to come out of the north pole. But since the poles of a...

Oct2712 06:39 PM
Lasand

4 
977 
A little while ago I asked: why does wind feel cold. The molecules are moving faster so it should feel hot. The...

Oct2712 06:19 PM
Chestermiller

5 
954 
Earlier I asked for help about a high voltage power supply, and I was told not to worry too much about 20k volts...

Oct2712 06:02 PM
harrylin

21 
1,806 
When we strike a match which is made of sulfur against a hard surface (I don't know what the surface is made of) a...

Oct2712 04:51 PM
DaTario

5 
1,211 