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Quality answers to common physics questions
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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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
166 160,381
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 63,680
Hi everybody, it's nice to finally join the forum. I'm a little...:uhh:...:confused:. Is electric current (the kind...
May7-10 09:10 AM
ruko
15 11,737
Now I'm not the smartest person in the world...just a snowboarder trying to get some help...so here is the information...
Dec4-08 02:44 AM
Mentallic
15 1,524
Alright, suppose you managed to build some type of massive ring around the Earth; concentric to the Earth, that is. ...
Dec3-08 05:17 PM
pirtle
15 890
Hi, I know that when we swing a pendulum, it will stop a while later due to air resistance. So my qs is if we...
Dec7-08 01:17 PM
Mapes
15 5,391
Let's for arguments sake say that we have an invincible superpower humanoid with as much strength as is necessary. ...
Dec11-08 12:24 PM
QuantumPion
15 4,369
Can the equation E=MC2 give you a value for a bodies gravity? If so whats the procces for working out mass? Thanks...
Dec18-08 09:56 PM
Gnosis
15 1,408
I am totally new to physics and do not study it what so ever. I do however find it extremely interesting and one...
Dec20-08 05:04 PM
Cemre
15 1,713
I have recently redesigned an antique falling block single rifle action and need some help calculating the poundage of...
Dec22-08 05:31 PM
schroder
15 2,730
Me and some friends where down the pub and an interesting idea came up. say a fly is flying and collides with an...
Jan20-09 07:34 AM
vanesch
15 1,727
I have a bike that has a mass of 100kilograms and its' wheels are 0.722meters in diameter. I am trying to calculate...
Feb4-09 11:55 PM
jambaugh
15 2,640
Now, I've asked about this on some other forums: and it seems all people are able to to is repeat what happens at...
Feb7-09 04:25 PM
Brian_C
15 1,129
One of the first things we learn is that the Earth rotates very quickly (about once a day). We, as very imaginative...
Feb17-09 11:54 PM
D H
15 2,260
I need some clarification with voltage and current and how you calculate the voltage and the current. Also when you...
Mar8-09 02:44 PM
.:Endeavour:.
15 1,386
I am just wondering if matter cannot be created or destroyed that would mean that were are not making new energy we...
Mar15-09 11:07 AM
DaveC426913
15 6,626
Why does the speed of light equal C? (ie. 3 x 10^8 m/s) Why isn't it 5 x 10^8 m/s, or 7 x 10^5 m/s, or 4 x 10^25...
Mar15-09 09:13 AM
DaleSpam
15 4,723
I have a question concerning magnets. Lets say i have 2 magnets each wieghing 1 gram each sitting on a scale. The...
Mar25-09 02:20 PM
malawi_glenn
15 1,740
classically, acceleration towards the earth's surface is described by a=G*m/r^2 usually we think of using this...
Mar25-09 01:06 PM
DaveC426913
15 1,795
My physics teacher today said in a nuclear reactor there is radiation called like sarencobe radiation I didn't hear...
Apr6-09 01:13 PM
QuantumPion
15 1,216
I've read that no matter what force is acting upon an object, no actual "work" is being done unless the object moves. ...
Apr15-09 04:29 PM
Doc Al
15 1,457
Hello , This is an extract from my book about my problem. http://img98.imageshack.us/i/infinityc.jpg/ I was...
Apr22-10 11:27 AM
mate0
15 2,528
I'm going to go under the assumption that whatever I say is right, even though I know it's probably wrong (it saves me...
Apr16-10 08:12 AM
cabraham
15 3,486
I found in a book the equation for the power loss caused by the heating effect of current in the transmission lines as...
Apr20-10 12:27 AM
xunxine
15 11,338
I'm not a physicist. So mathematics probably wont help me understand this issue. However, this has been troubling me...
May11-10 11:38 AM
jocose
15 2,169
I understand that there are multiple tests proving that electromagnetic waves carry energy through photons, but what...
Jun1-10 03:21 PM
JDługosz
15 1,523
I observed something interesting yesterday. At first, I couldn't explain it, but I figured it out after a few minutes,...
Jun16-10 10:37 AM
Archosaur
15 1,464
When did the first stars form? When did the first photons form?
Jul30-10 06:04 PM
JDługosz
15 2,088
So if i have a marble in a glass tube and i rotate the tube around in a circle . and the marble is at a distance r ...
Aug9-10 03:36 PM
cragar
15 2,227
Hello everyone, http://apollo.lsc.vsc.edu/classes/met130/notes/chapter8/graphics/centrifugal.free.gif Ok so I...
Aug4-10 01:24 PM
rcgldr
15 10,808
Imagine a closed isolated system consisting of 2 rooms separated by a window. The window is built with one layer of...
Aug14-10 08:11 PM
theDoc
15 2,244
Thought experiment: Our sun burns hydrogen at a prodigious rate, billions of kilograms per second. Let m = the...
Sep2-10 12:40 PM
stewartcs
15 1,870
No rules besides u cannot use a shopping cart,bicyle to build off of and u cannot use a motor or pedals with chain. ...
Sep13-10 08:00 PM
mender
15 4,865
I'm having difficulty understanding the principle. Particularly the concept of lowering potential energy. What i am...
Sep19-10 01:37 AM
highdream
15 3,641
This is from How Stuff Works: The power company essentially uses the earth as one of the wires in the power system....
Sep24-10 09:02 AM
epenguin
15 6,223
http://www.physicsforums.com/showthread.php?t=133173 On this question, someone stated that the "hump" on an...
Sep28-10 06:20 AM
chris major
15 1,984
I have a question, and forgive me for not presuming you have the same basic knowledge as my self. but I want there to...
Feb24-11 06:21 AM
Claude Bile
15 1,622
Hi everybody, I would like to begin with apologizing for anything stupid I might say or ask because I am not a...
Jan27-11 06:28 AM
Rap
15 4,521
This is first of questions, I may have more, hence the very general title of the thread. I know the basic optics...
Feb8-11 08:20 AM
Andy Resnick
15 5,190
why do we use a dual power supply? Why, for instance, do we use +12 and -12 volt instead of just a 12 volt power...
Jan24-11 07:16 PM
rcgldr
15 4,577
How are complex numbers used in physics ? Do they have any physical meaning ?
Feb17-11 05:25 PM
LostConjugate
15 1,163
Today in a lecture, prof asked that for 2 bulbs connected in series(100W and 40W), which was brighter? And the answer...
Mar3-11 09:59 AM
nasu
15 14,932

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