# Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
 Views: 8,596 Announcement: Two free ways to get Gold Membership! Jan17-12 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 05:26 AM ZapperZ 1 41,188 Hello, For a given vehicle, I want to use a given chart for engine torque vs. engine speed (or hp vs. engine speed)... Apr3-10 04:13 PM rcgldr 1 3,233 Trying to get my head around something with the Darcy Weisbach. It is used to calculate the head loss of a moving... Jul31-13 06:57 PM SteamKing 1 381 Hi guys, I'm wondering if anyone knows of a conversion method for these two units. I'm developing a calculator... Oct7-10 03:19 PM Doc Al 4 2,646 Hello everyone, I am currently working on a project where I am trying to find power by being able to measure the... Dec28-09 01:32 PM SystemTheory 8 4,083 Hey all. I'm trying to find more info on converting moving ions into electricity. AKA Direct Energy Conversion. Anyone... Mar14-11 02:59 AM Drakkith 2 1,051 I'm having trouble with this one: How do I convert joules to newtons? Say I have a source of energy E that is... Dec31-10 11:32 AM Andrew Mason 5 8,243 Hi guys , Suppose there is a circular accelerator has the same inner structure of a linear accelerator in terms of... Nov12-12 07:30 AM mfb 12 1,381 I was watching an experiment that I don't understand. The professor turned a hand crank that generated electricity to... Mar10-07 08:13 AM Mentz114 2 13,297 Let's say we have a battery of with a given electrical capacity and we are trying to maximize the work being done with... Dec10-07 01:29 PM kmarinas86 10 2,814 I have an argument that I would like to have settled. In another forum, the original poster asked a general question... Apr4-10 12:47 AM BobCat123 23 2,113 Say i have an acurate barometer that in this case reads QFE, is there any way that if i called up an airport's ATIS... Jan25-09 08:42 AM xajgyk 9 13,101 Does there exist a device to convert a unidirectional linear motion into a rotational motion? I have only been able to... Feb9-12 10:43 PM bp_psy 16 6,780 Is there a way to get energy density from watts, with the resultant energy density not involving time, as watts do? ... Mar31-12 03:05 AM jaketodd 8 1,261 I'm sure this is a rather simple calculation, but I just can't seem to get it right. During a recent lecture a... Jun29-11 12:38 PM phyzguy 3 1,575 Hey, When dealing with convex mirrors I know that the image will always be virtual,upright and diminished. So when im... Jan28-10 05:01 AM Doc Al 1 775 sand is pouring on a conveyor belt in a rate of rate of dm/dt kgs-1 if the velocity of the conveyor belt is v ms-1,... Apr17-11 07:28 AM me189 6 1,293 Hi experts, I'm trying to model a conveyor system (like this http://www.iccconveyors.info/videos/GapMaster.html)... Jul3-08 02:28 PM Medica8ed 0 1,093 Does anyone know what the equations governing the effects of whistling in a convoluted tube as air passes trough it... Oct8-12 10:58 PM manjagu 2 511 is it possible that instead of heating the junction ... of thermocouple.... we supply the current n the juntion cools... Jul14-10 06:37 AM harsh077 4 852 Hi all, this is kind of a basic question and I am looking for a simple formula to use to illustrate how an idea is not... Sep25-12 05:41 AM AlephZero 3 565 Our air conditioner has broken so i was bored and started thinken about something. I calculated that a 10 pound bag... Jun6-05 05:57 AM Q_Goest 9 4,788 I have a practical problem that I am trying to solve regarding using air chambers. I hope someone can help me with... Dec14-13 10:23 AM Baluncore 4 316 how does the cooling capacity of an aircon compressor exceed that of the power supplied to it? from what i... Mar21-05 11:45 AM Clausius2 18 2,363 A cooling system for a fridge at a store has a cooling effect of 35 kW. I'm having a bit of trouble understanding what... Nov30-05 02:29 PM ZapperZ 1 1,157 Here's the situation: A heated object is in space, with no close proximity to any star. It is simply in one... Dec1-05 01:09 PM alfredblase 8 1,087 If I have a spherical container with volume 10 in^3 filled with air at 1000 F and 100 psi pressure and the container... Mar20-09 05:28 PM alabra27 3 1,417 Why is it that two spheres,one hollow and other solid having same material and size and heated to same temperatures... Dec18-11 10:43 PM DaveC426913 7 1,514 I would like to determine how long it would take a volume of water to cool from an initial temperature to a final... Jul21-09 04:58 PM mgb_phys 4 894 Hi, due to the fact that its not my daily work, I how someone could help me to find a startingpoint, how to solve my... Aug10-12 04:14 AM KESchnitzler 0 403 We were having tea with the family and my brother and I started wondering if holding the cup will help in cooling the... Jul1-08 02:17 AM Borek 8 2,243 I figure that it is possible for temperature to decline in a fixed volume system that is thermally insulated. The... May15-12 11:51 AM kmarinas86 6 1,075 Let's take a system, for simplicity with only one degree of freedom, described by a certain lagrangian L I... Aug26-10 07:16 AM lalbatros 1 689 http://i209.photobucket.com/albums/bb176/hypernihl/figure.png So, I've modeled the interaction between two... Mar11-12 11:17 PM hypernihl 0 668 Im curious about an electric field (somewhere of radius s) inside a solid sphere (radius a) such that: \int... Nov16-09 07:12 PM Skullmonkee 2 535 Start with: $\frac{d}{dt}$ $\frac{dL}{dx"}$ = $\frac{dL}{dx}$ (d/dt)(dL/dx") = (dL/dx) Now intruduce three... Sep9-08 08:44 PM alejandrito29 0 611 Hi, I am u little confused about general coordinates at all. I don't know functions of what are they. For... Dec27-11 03:10 AM lakmus 0 592 Hi, has anybody worked with heat pumps? I'm recently confused about how the heat pump compressor operates. Does it... Jan21-11 01:22 AM ikhlaq 5 9,354 Hi, I think I have confused myself over the COP of a refrigerator. I have refrigeration system and a certain set... Jan5-09 04:03 PM skaboy607 0 1,473 Hi All, I'm doing a study on effects of outside temperature on the energy efficiency of air-conditioning systems in... Feb26-10 07:33 PM russ_watters 5 9,053 Not sure if I am doing this correct and do not have answer available... A heat pump takes on 30,000BTU/hr of heat and... Oct28-12 11:41 PM Andrew Mason 1 758