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May25-09 10:31 AM ZapperZ 

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General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 63,518
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
Apr8-14 10:13 AM
ZapperZ
166 159,909
Hello everyone, I am working on producing a torque rod (basically a solenoid) for use in a spacecraft that I am...
Jul14-08 12:02 PM
Kydharis
0 4,786
The following attached file is a free body diagram for a bicycle. Please excuse the crudity of the drawing, I drew it...
Dec31-08 12:23 AM
gearhead
0 1,951
Does anyone know how to convert 2000 ft lbs of torque into linear weight? I have an electric brake capable of holding...
Dec8-12 12:12 AM
K^2
2 739
Please let me know if the formula that i had genreated to calculate angular acceleration is correct. Problem...
Oct25-10 08:22 PM
pines344
0 2,406
I have a question having to do with the affect of torque on a vehicle. I have 2 situations to make it easier to...
Oct23-09 07:56 AM
xxChrisxx
3 1,732
This problem should be an introductory physics problem, but I am not sure if I am going about it the right way. This...
Apr20-13 04:15 PM
amainejr
3 451
Imagine, I drop a stick with uniform mass horizontally towards the ground. There is only one force acting on it, which...
Oct5-12 03:20 PM
0xDEADBEEF
2 1,021
This isn't a homework question. I'm really confused at this, say you're holding a massless ruler / stick and there...
Feb21-10 08:36 PM
The_Journey
3 1,754
Let's say we have a 2d ship made up of two engines and a body attached by rigid bars: E--M--E If the engine on the...
Sep26-04 08:21 PM
Alkatran
0 875
Hello. The question reads, "...This is the world's heaviest hinged door. The door has a mass of 44,000kg, a rotational...
Feb28-08 02:55 PM
JFlash
0 2,310
Hi, I was thinking about doing an experiment on the torsion balance, but hundreds of people already experimented on...
Oct10-10 09:21 PM
kakashi1027
0 675
i just need to know what is the name of the ruler that measures the wire when we want to change the length wire??...
Dec1-11 01:55 PM
queenstudy
0 706
Is anyone familiar with a rope skein like on a torsion catapult? Essentially there are two points between which a...
Jan3-08 09:26 PM
Adam Braley
0 4,939
Could someone please point me in the right direction for finding formulas dealing with torsion springs and also...
Jan18-05 08:50 PM
Gokul43201
1 2,571
i just want like 3 to 4 lines about the history of torsional pendulum like who started with it and what is it used...
Dec1-11 06:51 AM
121910marj
3 1,386
I can't find any info on the net on this can anyone help. I've found plenty of theory on singular torsional pendula...
Jul12-09 10:45 PM
Kristopa
0 544
has any one ever noticed that if u hold a chain at one end and spin it round real fast u get a kind of oval shpere...
Jul22-03 01:32 PM
arcnets
3 3,933
Hi, does anyone know how to calculate the total absorptin of a sample from its labdam-absorbance spectrum? I found a...
Oct19-12 10:00 AM
mfb
1 645
Is the total electric charge of the universe zero? Positive? Negative? Is the charge conjugation symmetry broken in...
May22-04 08:08 PM
Antonio Lao
2 1,695
Do you think the total electric charge of Our Universe is zero?
Apr1-05 06:50 AM
SpaceTiger
5 1,781
I wanted to know the average total energies of an isolated hydrogen atom's electron and proton separately. I came...
Dec20-10 02:06 PM
dirtyd33
2 1,106
Does anyone know how to calculate the total energy of magnet? Thanks!
Nov10-09 05:46 AM
Shantaram
4 3,236
I was presented with a very simple physics problem today which unfortunately stumped me for some reason: you have...
Apr15-08 12:24 PM
Mephisto
4 1,202
I'll ask this in the form of an example. A bus is traveling at some speed and there is no wind. The bus experiences a...
Sep27-09 07:12 PM
rcgldr
0 617
The KE (kinetic energy) of an electron revolving around a nucleus is always positive, and the PE (potential energy) of...
Oct15-12 08:26 AM
AudioFlux
2 1,102
Its stated that total energy of an isolated system is given by E = \frac{1}{2}mv^{2} + \frac{1}{2}Iω^{2} + mgh. ...
Jul7-12 10:24 AM
alterecho
4 731
Suppose we've got two still particles of any mass we would like, infinitely far apart. The total energy here is of...
Jun5-13 10:23 PM
s0ft
6 748
Applying the 2nd law of thermodynamics to the whole universe is tricky, since if the whole universe would always...
Mar1-12 07:26 AM
mc^2
16 5,419
I have a question that has been bugging me lately. How is it that you determine the total error of a measurement? ...
Sep9-08 01:32 PM
Topher925
8 11,183
I am trying to figure out force of each vehicle if both travelling at 13.4112m/s one weighing 65kg and the other 75kg...
Nov26-08 04:48 PM
fireblade101
3 571
Is the total impulse of a rocket, divided by its weight, the Isp of the rocket?
Jul8-10 09:05 AM
7gear
0 732
Does anyone know how to get the total impulse of a model rocket? I know that there are various equations to use, but...
Jul4-10 04:16 PM
7gear
0 1,347
Why does total internal reflection happen in glass?
Mar10-09 03:44 PM
Bob S
4 1,734
How is that in refraction of light energy is lost but not in case of total internal reflection? Is the loss in total...
Feb18-11 06:28 PM
sophiecentaur
6 2,573
Does total internal reflection occur if the refraction of light is passing from air into water? Thanks
Jul30-11 02:49 PM
tiny-tim
1 853
If there is total internal reflection, does the angle of incidence always equal the angle of reflection? Thanks
Jul30-11 05:12 PM
fromthepast
2 663
Why is it that T.I.R. only occurs when a light is traveling from a denser to a rarer medium? Intuition suggests that...
Apr9-08 02:18 PM
billiards
4 2,295
I did an experiment on the speed of light with different length of optical fibers. I know that the fiber has a...
Apr2-09 11:09 AM
ATH500
6 3,910
Imagine a square prism made from some material with such an index of refraction and surrounded by a substance of such...
Jan24-14 06:22 AM
Claude Bile
4 256
Question about Total Internal Reflection? My textbook says that for total internal reflection to occur 2 conditions...
Jan6-11 03:37 PM
Doc Al
3 4,221

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