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

Apr2211 05:26 AM
ZapperZ

1 
46,936 
Why doesn't an irreversible adiabatic process follow the equation,
PV^(gamma)=constant?

Aug1205 03:22 AM
asdf1

3 
2,745 
I need to do a practical about a yoyo.
We made a video (somebody keeps te jojo from teh ground a certain height...

Jan2404 11:09 AM
drPaZQaL

9 
2,744 
Hi everyone,
I've got a set of airfoil blades here which are homogenious and have a constant profile (xsection)....

May2511 11:54 PM
ntn

3 
2,744 
In the chapter relative to First law applied to flow processes, my book explains the "Flow Work" which appears in the...

Jan2212 10:19 AM
I like Serena

12 
2,744 
I wish to understand evaporative cooling. Apparently the principle consists in pumping the vapour above a bath, hence...

Jul2208 07:06 PM
Angelos K

4 
2,743 
Hey guys! This is a question that has been troubling me for a bit.
What causes electro magnetic waves to be...

Aug2011 09:33 PM
SteamKing

15 
2,743 
I can completely understand why the idea of vectors works for distances. ie  you can use pythagora and trig to work...

Aug2504 02:52 AM
Galileo

5 
2,742 
Newton's law of universal gravitation is only valid for point masses. Is it just chance that a person on the earth...

Jun2908 10:25 PM
gamesguru

5 
2,742 
Hey all,
I am having trouble determing how to get the max amplitude of an underdamped oscillation.
Can someone...

Oct108 03:50 PM
mathman

1 
2,742 
Hi, my question is about determining the damping ratio for the upper springdamper part of the system given in the...

Dec109 12:11 PM
SystemTheory

1 
2,741 
is there any equations that can be used for calculating required pump pressure for a horizontal running water pipe...

May2610 01:34 PM
Bob S

1 
2,741 
A question has been bothering me for some time  when we look at the sun, what are we looking at?
The standard answer...

Jun2510 03:47 AM
Borek

9 
2,741 
Hi
I'm trying to get a better understanding of dispersion in light. Specifically, the relationship between...

Jan1211 07:47 PM
Beermonster

9 
2,741 
A damped oscillator is described by the equation m(x'') + b(x') + kx = 0, where the damping force is given by F =...

Nov2911 03:43 PM
dacruick

5 
2,741 
We've been set the question of In an isothermal expansion, and ideal gas at initial pressure Po expands until its...

Mar704 10:06 AM
Claire84

3 
2,740 
I had a highschool student ask me this question, and quite frankly, I don't know the answer. It seems obvious by...

Nov2108 10:57 AM
D H

4 
2,740 
I have noticed that when an inflatable tube (usually with a passenger on top) is being pulled fast behind a speedboat,...

Jun2011 01:52 AM
rcgldr

1 
2,740 
Assume there is a boat of length 4 m weighing 40 kg. One man of weight 50 kg is at one end (A) and the other of weight...

Jul2911 12:34 PM
Dickfore

31 
2,739 
E.g. A football of mass 1kg is thrown with a speed of 10m/s at an angle of 30 degrees from a horizontal plane. Take...

Apr109 01:27 PM
Georgepowell

6 
2,738 
hey do you know how to calculate what is the physical size of the amplitude of a radio wave?
like I know how to...

Dec1110 03:10 PM
cjameshuff

1 
2,738 
I am trying to detemine the moment of interia of an object, not too accurately.
I have the object mounted in...

Apr1305 06:02 PM
jamesrc

1 
2,737 
hi,
in the case of elastic collision of two balls in constant speeds, if we took the origin in the center of of one...

Feb1006 06:51 PM
Doc Al

9 
2,737 
I know what the definition of torque and angular momentum is.
But I read in a few books that
"Torque and angular...

Aug410 12:19 AM
metalrose

22 
2,737 
I'm confused by something very simple and stupid. When the mass of a satellite is tiny compared to the body being...

Jan2612 12:16 PM
DaveC426913

19 
2,737 
I understand the basics of speed and velocity, but I got a rather backhanded question on a recent test that I believe...

Oct1111 11:13 PM
cepheid

3 
2,736 
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 
2,736 
Hello, I have read over many textbooks and websites (including posts on this forum) relating to the concept of tension...

Mar1207 07:04 PM
p3t3r1

10 
2,735 
Hi
i m new here. i 'll get straight to the point.
we know that a thermodynamic system always tend to proceed to a...

Mar2309 07:15 PM
Bob S

17 
2,735 
To create a solenoid, conductive wire is coiled with n # of turns per unit length. To create a real solenoid can each...

Jun208 07:42 AM
benabean

2 
2,734 
I am a TA in a class covering an introduction to fluid mechanics, thermodynamics and wave motion. We just finished the...

Nov910 08:44 AM
zonde

3 
2,734 
Hi, Hope someone can help me clear up this question. I know the answer but I am unsure of the reasoning behind it, so...

Dec2609 08:17 AM
ian2012

10 
2,733 
Say you have a target with a velocity on the x and y axis and acceleration on the x and y axis.
Now, you have a gun...

Mar1607 09:48 AM
lpfr

1 
2,731 
I understand that to find moment of force, we look at direction of force and perpendicular distance. In the diagram, O...

Sep2309 04:52 AM
Doc Al

1 
2,731 
Hi,
I'm trying to take this Sellmeier equation,
n^2 (λ)=1+ (B_1 λ^2)/(λ^2C_1 )+(B_2 λ^2)/(λ^2C_2 )+(B_3...

Jan2510 11:33 AM
elect_eng

1 
2,731 
Hello, I am having trouble finding solutions for a localized electromagnetic pulse in 3D. Ideally, I'd like the...

Dec207 11:10 PM
Claude Bile

13 
2,729 
I have a problem consisting in solving for potential in 2 dim polar coordinates where I am asked to use circular...

Nov411 11:31 AM
Andy Resnick

7 
2,729 
How to visualize thhe components of the energy tensor????
I mean to say that what it means to say that "the amount of...

Feb608 03:15 PM
robphy

2 
2,728 
I'm unsure about the equation Q = It (charge = current * time). Say we have a perfect circuit with minimal resistance....

Feb1109 11:45 PM
Archosaur

19 
2,727 
hi
here's a questn:
"2 vectors acting in same direction have resultant 20 whereas in perpendicular direction...

Jul2505 04:34 PM
Antiphon

5 
2,726 
In Popper's autobiography, published in his contribution of Library of Philosophers, I read the following, after...

May1706 02:54 PM
lalbatros

17 
2,726 