# Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
 Views: 761 Announcement: End of year contest, $75+$50 prize! Dec18-13 Meta Thread / Thread Starter Last Post Replies Views Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people... Apr22-11 06:26 AM ZapperZ 1 40,041 Here's the situation: We have a ruler, inclined slightly with a strong ceramic magnet at the end. Now, we put two... Jan20-07 11:52 AM daniel_i_l 7 2,096 Hi all, What causes the electrons to jump into holes?? Thanks, Karthikeyan.K Jan19-07 06:37 AM daniel_i_l 2 3,480 Ok, I don't get this, when a sphere moves over a frictionless surface tilted downward so getting accelerated, does... Jan19-07 01:01 AM jtbell 1 1,962 Hi. I have a qualitative question about the work done from state 1 to state 2 of a Carnot cycle. This is the... Jan18-07 07:13 PM G01 2 1,803 the question is if we have the constraint: g(q,p)-C=0 for a real number C then we have that derivating this... Jan18-07 07:31 AM Kevin_spencer2 0 1,744 I have been stuck on the question for so long........please can you see if you can help me out.:smile: Is the... Jan17-07 09:38 AM wxrocks 3 1,698 Ok, first I'll mention that I'm completely new to these forms (first post) and all that jazz. Anyway, on to the... Jan15-07 10:26 PM Gaijinja 7 2,523 objects near the earths surface fall towards the center of the planet due to the force of gravity caused by its mass. ... Jan15-07 05:43 PM Integral 10 1,464 Intuitively, if we have a beam nailed down to a box of some sort on one side and have the other side of the beam stick... Jan15-07 08:02 AM FredGarvin 3 5,717 A ball bearing is held in a cup on the end of a pivoted rod. Weights can be added to the end of the rod opposite to... Jan15-07 05:00 AM planish 3 2,054 (I didn't know where to put this one, so somebody will eventually move it, I predict...) This is a absolute... Jan14-07 07:24 PM StatMechGuy 3 2,739 The thermodynamic explanation of irreversibility - does it include the microscopic view of a process, i.e. the... Jan13-07 08:49 AM erty 3 1,199 From http://www.astro.cornell.edu/academics/courses/astro201/vt.htm : Conditions: Stable Self-gravitating... Jan12-07 01:09 AM kmarinas86 2 1,096 For my advanced higher physics investigation I've been given the topic of thermal conductivity. Basically I am... Jan11-07 09:08 AM Dhesi 6 3,456 Hi, There is some evidence that on a silboat going to windward in moderate to strong wind, heeling the rig over to... Jan10-07 11:57 PM ken 7 1,924 Hi. The problem is "A wooden block of mass m slides with an initial speed of vi up a straight incline that makes an... Jan10-07 05:50 PM velvetymoogle 1 1,303 Why does the Lagrangian density for the EM field in a dielectric medium take the form d^3 \bf x \left? I can see that... Jan10-07 02:54 AM vanesch 5 2,325 If we have that Lagrangian is equal to L=T-V and Hamiltonian is just H=T+V my question is if for every lagrangian we... Jan10-07 02:14 AM dextercioby 6 1,322 Can one determine a local electric field by the change in interference spectrum of a soap bubble? If one notes the... Jan10-07 02:01 AM gabee 4 1,526 i read in a book that their existence can theoretically be proved. With my knowledge of moving charges-mag.... Jan9-07 11:53 AM ZapperZ 1 1,355 Can a uniform diffraction grating (a window screen) alone focus objects (bricks on a building beyond) so that a... Jan9-07 11:26 AM Loren Booda 4 1,609 In textbooks I’ve read that the Coulomb’s force law is accurate up to 10^-12 m. Below this limit the force between... Jan9-07 04:08 AM Sheyr 2 1,894 I recently read that Maxwell's equations can be written in a more concise form as the following: ... Jan8-07 05:42 PM samalkhaiat 15 1,844 has thermodyamics been unified with QM? i thought that thermodyanimcs arises because of things that happen on the... Jan8-07 12:44 PM jrrship 4 1,110 Let us assume that a body is to travel from point A to point E, with B, C, D being intermediate points. The points... Jan8-07 05:55 AM KK 0 3,112 Imagine driving a hypothetical SUV(or any car for that matter) in an airless environment and assume that you manage to... Jan7-07 04:08 PM yasar1967 5 1,262 I could not help but notice in my daughter's first year university physics text what I think is misconception of... Jan6-07 11:21 PM Drasnian 31 6,119 Hey, How does a Tube Magnet's magnetic field differ from that of a normal bar magnet? What effect does the... Jan6-07 07:11 PM healey.cj 3 2,478 Let's say you put ina battery that's 9 volts. YOu can vary the voltage on the device. Is it changing the battery... Jan6-07 01:35 PM chroot 13 1,270 Can someone direct me towards or provide me with a derivation of Lagrange's equations in one dimension? Are Hamilton's... Jan5-07 09:50 AM Reshma 7 3,192 From experiment, it's easy to see that if we balance an industrial sized broom with one finger at it's center of... Jan4-07 07:14 PM PhysMaster 7 8,974 Some research on wiki, google and this forum seem the state that planes fly because of Bernouilli, i.e., the... Jan4-07 12:54 AM vivesdn 3 1,823 i understand that an em wave can be produced due to an oscillating electric field or oscillating magnetic field... but... Jan2-07 02:55 PM reilly 6 1,385 i've heard that if you are a boxer or pugnacious in general you should follow through on your punch. but in light of... Jan2-07 02:22 PM turbo 17 4,890 I was surprised not to find a question about this from before, but the question is simply; does a "normal"... Jan1-07 01:50 PM misnoma 11 17,347 Are really revolvers, shotguns and rifles powerful enough to toss people backwards? Or is this an image created by... Dec31-06 11:57 AM misnoma 29 5,648 Long time since my last time. I've found a system that seems to work in a kind of perpetual motion, BUT please, do... Dec31-06 11:41 AM cala 10 2,482 In an electrical circuit, when current flows through a resistance, heat is produced. Is there some quantity (?) into... Dec30-06 03:05 PM russ_watters 2 2,055 This question may sound ignorant. When it comes to physics, I guess you could say I'm physically challenged. Still, I... Dec30-06 09:32 AM Jota 2 1,586 Building tower out of balsa wood that needs to hold a loading bar attached to a bucket of sand. Does the angle of the... Dec28-06 03:48 PM laura_jane 0 1,947