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

Apr2211 05:26 AM
ZapperZ

1 
47,848 
F=ma
eg, a static bag of a 1kg weight has a force on the table of .98N.
if it were to fall, would its force hitting...

May112 01:11 PM
K^2

14 
2,397 
Good Morning
I am new user on Forum and I'm sorry for all mistake. I am living in Poland and My English is on the...

May112 12:46 PM
dexter90

8 
751 
Hello all,
i have a copper bowl and a motor is fixed in it. the motor has a nickle ball fixed on the tip of arm....

May112 11:37 AM
atulchandna

0 
582 
Can the group refractive index ng be 1>ng>0 ?

May112 11:03 AM
chrisbaird

3 
999 
Considering very thin capillaries, such as found in wood to transport water (~100Micron), I understand that the two...

May112 10:53 AM
chrisbaird

5 
1,103 
I try to compare relative pressure and global pressure. The pressure of water on the cone give the weight of the...

May112 10:13 AM
Gh778

0 
609 
A square loop carrying a current I creates its own magnetic field. Describe the forces on each side of the square loop...

May112 09:00 AM
mfb

1 
980 
Hi guys, I have a few doubts on Rotational Motion and hope someone can help me out.
This 3 formula is for finding...

May112 05:49 AM
freshbox

6 
1,038 
What is needed to calculate expected ripple frequency for crank rotation of 2 rev/s, What formula is needed?

May112 05:12 AM
pokie_panda

0 
825 
Hi guys, I have a question regarding heat transfer. When I have a piece of heated metal which is left to cool down in...

May112 04:46 AM
PhysicoRaj

1 
1,375 
How is electric potential manipulated in batteries? Why do some batteries have a rating of 1.5v and others have...

May112 04:32 AM
PhysicoRaj

3 
1,520 
This is probably really sad that I am posting about this.
I am doing my Modern Lab on Spectroscopy of Hydrogen and...

May112 03:00 AM
GreenAce92

5 
695 
I'm looking over my notes here, we have a rolling disk down an incline plane and my goal is to find its acceleration...

May112 02:28 AM
haruspex

3 
1,244 
I've gotten the impression that the most general case for monochromatic light is elliptically polarized light. But...

May112 12:57 AM
Rap

5 
1,760 
Hi, I'd like to use a millivoltmeter to research voltages induced from a basic ceramic magnet brushing by a conductor....

Apr3012 09:01 PM
Bob S

5 
1,093 
Can a tunable dye laser be used as a pump for an NDYAG laser? If so, which is most efficient  in terms of secondary...

Apr3012 07:21 PM
mark_d

0 
717 
If a straight length of wire moves in a suitable direction through the magnetic field of a magnet, there will be a...

Apr3012 04:48 PM
MS La Moreaux

7 
1,163 
Hi All,
I've done a quick google, and I can't find anything obvious (first 3 pages) about the formation of magnetic...

Apr3012 02:33 PM
chrisbaird

1 
633 
Can anybody please tell me how pulleys and levers multiply forces without using ideas such as input power(or work)=...

Apr3012 02:25 PM
chingel

16 
4,040 
How do we measure the amout of charge body has. Can you tell me some instruments and how do they work.
Well i know...

Apr3012 01:53 PM
truesearch

4 
1,898 
Why the speed of water in the middle of the smooth flowing stream is high than its speed on the sides?
Is it due...

Apr3012 10:59 AM
boneh3ad

4 
795 
The noslip boundary value constraint for NavierStokes solutions was explained in my fluid dynamics class as a...

Apr3012 09:33 AM
Andy Resnick

1 
1,044 
Hi all.
I am learning physics and I have the following problem.
Suppose there is a ball of mass m traveling with...

Apr3012 05:49 AM
DaleSpam

20 
2,468 
The following discussion emerged under the topic "at rest" in Einsteinian relativity, and while out of place there it...

Apr3012 04:28 AM
Ken G

107 
7,812 
If you are holding an object off the ground and let it go, we say that it's potential energy is transformed into...

Apr3012 03:05 AM
Opus_723

2 
876 
Hi all,
I went to an engineering school 40 years ago but never finished, so I kind of know that this is easily...

Apr3012 12:24 AM
K^2

4 
725 
Hello. I need help with some thermo basics.
I can't understand the concept of constant volume...

Apr2912 11:44 PM
Andrew Mason

8 
1,540 
hey guys i have a question. i solved the problem but i dont understand how to do it.
Two perpendicular straight...

Apr2912 02:56 PM
tinytim

1 
1,212 
Molecules in an ideal gas contained in a vessel are striking the vessels wall. I am trying to find the total kinetic...

Apr2912 11:24 AM
mSSM

1 
1,373 
Compound pulley:
angular velocity is the same, linear velocity is different.
Pulleys in contact:
angular velocity...

Apr2912 09:40 AM
freshbox

0 
683 
How does circular motion in a cone without gravity work?
If I have an object and I let it circle through the inside...

Apr2912 09:29 AM
Cleonis

2 
1,405 
I do not know the exact electrochemical reactions which make a battery work, but I understand that the essential...

Apr2912 08:30 AM
phinds

16 
3,282 
I've read that permittivity is resistance offered to flow of field lines,But vacuum does not have anything in it to...

Apr2912 08:27 AM
PhilDSP

22 
3,213 
Ok , so I was wondering if you could legally build a cyclotron accelerator , I am fourteen years old , so if there...

Apr2912 06:53 AM
Vanadium 50

6 
1,102 
I would like to know if pressure is different in water due to the difference of gravity (like 1/dČ) ? If yes, why a...

Apr2912 06:32 AM
Gh778

16 
1,328 
Hallo everyone.
I had a equation about energy in a form of "rotational kinetic energy".
Imagine this situation...

Apr2912 06:27 AM
jartsa

15 
1,525 
right now, I'm following the MIT thermodynamics video lecture.
I've gone thru
dU = dw + dq
(d for "is path...

Apr2912 03:52 AM
mSSM

1 
4,140 
So given any vector field V(x, y, z) in three dimensional space, is it possible to create an electric field that is...

Apr2912 03:05 AM
vanhees71

1 
822 
By definition
total energy of a system= (internal energy U) + K.E + P.E
and
mechanical energy of a system= (flow...

Apr2912 01:14 AM
Ritz_physics

0 
510 
Hi, I'm looking for the derivation of (BH)max of a permanent magnet,
(BH)max= {Uo*(Ms)^2} /4 Uo =...

Apr2912 12:37 AM
physlover1015

0 
1,119 