Classical Physics

Why is it that when a hole in a canal is lower, the water gets pushed out further? and the higher, the water gets pushed out closer?

Since I was a college student, 20 years ago, I have been touting the virtues of nuclear fusion. It has been my belief, and still is, the our government should throw all available resources into the development of fusion. The break even point for extracting more energy from a lab fusion experiment than was put into the process has been successful. Fusion power could provide us with limitless electricity which could be used to separate water into hydrogen and oxygen. Hydrogen is the ultimate power source as the only byproducts from burning it is vapor of dihydrogenoxide. Greg Lundgren gxlundgren@yahoo.com

can someone please help me understand how you do the following problem Theory suggests that T and d are related by the equation T^2 = kd^3+((4pi^2l)/(g)) where g is acceleration due to free fall and k is constant. Use your answers from ... (from that i found that gradient = 20.5, and y-intercept = 0.0670) and the value of l to find values for k and g. Please help I am totally lost.

I am slightly confused about accretion disks……. if all matter (including light) is drawn into the disk (which is circulating in one direction), then is there not a difference in the strength of that (gravitational) force according to what direction the ‘matter’ in question approaches it? To try and clarify this further, supposing we have two photons of light travelling in opposite directions, one approaching the point of ‘no return’ in the same direction as the disks rotation, and one in the opposite direction (to that rotation), and we assume that their paths are such that the photon travelling in the same direction as the disk - will only just be caught by the black…

hey guys, im a high school gr 12 physics student *harsh*, and we are doing a seven week EEI (extended experimental investigation) which i and my partner are having problems finding an idea for. our school has (if you are familiar with it_ alot of texis instrument calculator sensors so they are not a problem... but the report writeup needs to be long and we can only think of simpleish experiments... ANY IDEAS?

Hi guys, I'm having trouble understanding what average speed is all about. The equation that I know of calculating average speed is: a(subscript av)=delta d/delta t. Now is average speed the total distance travelled over total time as my book says it is? I'm kinda confused at that because how can the total distance travelled divided by the total time travelled give you the average speed. Isn't that the instantaneous speed? Suppose i'm observing a distance-time graph and the line is not straight but rather curved. If i follow the terminology from the book, all i would "need" to do to find the average speed is look at the total distance travelled and divide it by the t…

WHAT ABOUT THAT UNIVERSAL CONSTANT OF "G" We are aware that a celestial orbital condition involves the mutual rotation of the two bodies around a common center of rotation (or center of gravity if you insist) with equal angular velocity. We are also aware that the ratio of the radii must be mathematically identical to the ratio of the tangential velocity, and inversely proportional to the ratio of the "mass" values: That is R1:R2 = V1:V2= M2:M1. Now let us apply that knowledge. We will assign a fixed mathematical value of 1 to the "mass", tangential velocity, and radius of rotation to the first of two celestial bodies. Then we shall assume a range of possible mathe…

what about wind power? if we had enough wind generators, could we essentially make enough 'drag' on the air that average wind speed started dropping? im not actually sure where wind comes from (apart from beans)... is it just differently-heated air that causes wind? [edit]umm...how did that happen? YT and klaynos seem to be posting from the future? [/edit]

A block is hung on a spring, and the frequency [math] f [/math] of the oscillation of the system is measured. The block, a second identical block, and the spring are carried into space. The 2 blocks are attached to the ends of a spring, and the system is taken out into space on a space walk. The spring is extended, and the system is released to oscillate while floating in space. What is the frequency of oscillation for this system, in terms if [math] f [/math] I know the answer is [math]\sqrt{2}f [/math] . But how do we get this? Thanks

Why does Young's Modulus imply that there are atoms on a wire? In other words, in when stretching the wire, why is it implied that there are atoms?

Hi, I wonder if someone could help me with two motion problems. The first one is: A car can accelerate at 1.9m.s-2. It is initially travelling at 19m.s-1 when it passes through an intersection and it then accelerates for the next 85m. What is the final velocity of the car? And the second one is: A car is travelling at 95km/h for 130km, and then slows down to 65km/h. It takes 3 hrs and 20 mins. How far has the car travelled? If someone can help, I would be very grateful!! God bless.

cn sum1 plez explain 2 me how u cn work out tension??? and how u work out this a car with a mass of 1200 kg accelerates from rest to 8.0m/s, it is towing a tralier with a mass of 200kg. wat is the tension between the car and the trailer when acceleratin? plez explain it 2 me lol i am so confused thnx

Hi, can someone please explain to me how you work out tension. Here is an example of the problems I have. A lift of mass 480kg is designed to carry a maximum load of 3000N. Calculate the tension in the lift cable at maximum load when: a)The lift moves down at a steady speed. b)The lift moves downward, accelerating at 1.5ms-2 c)The lift moves upward, accelerating at 1.5ms-2 Thank you so much!

cn sum1 plez explain to me how u work out tension.. thnx soo much:eek:

Well I have a feeling this is gunna be a headache to answer !!! any help would be sooooooooooooo apreciated: I'm in the process of working out the thrust produced by a rocket, I'm using the following equation: (i apologise for not using latex) Fg=Mdot x Ve + Ae(Pe-Pamb) where: Mdot = Exhaust gas mass flow Ve = Jet velocity at nozzle exit plane Ae = Flow area at nozzle exit plane Pe = Static pressure at nozzle exit plane Pamb = Atmospheric pressure (101.325 kPa) I can get Mdot with: (A star * pt/sqrt[Tt]) * sqrt(gam/R) * [(gam + 1)/2]^-[(gam + 1)/(gam -1)/2] where: Astar = the area of the throat. pt = the total pressure in the combustion cha…

I need a way to relate pressure and volume without temperature. I've tried deriving an equation myself but I can't get one that (seems to) work. Long story short, I need to determine the initial volume of a gas (air) needed to bring a projectile to a specific velocity, without knowing or measuring temperature change. Diameter/radius and length of barrel are both constant in each case - but a general format is needed that keeps barrel length and diameters as variables. In other words, for the purposes of differentiation/integration, diameter and length are constants, but for final equation form, must be variables. I'm perfectly willing to derive the final equ…

OK Chaps, can you apply your knowledge to something practical? Is it more efficient to have ones boiler on high and the radiators on low, or the other way around. Apparently the answer isn't as straightforward as one would assume. Bombus

consider a train moving at a constant velocity. let the top of the train be open.drop a ball verticaly to the train from a bridge ,while train is crossing the bridge.What will be the path ball.Again drop the ball when the train is stopped below bridge. In both cases the ball will hit the floor of train at different places.Can it be considered as a physical experiment showing different results of same experiment for a body at rest and a body moving at a constant velocity? Now can we call the moving train as an inertial frame.

Lets say an LR circuit has an inductor and a resistor. This mean that is it non-oscillating right?

Time Dilation As far as I am concerned I believe laws as simple as of Sir Isaac Newton’s should govern the universe. So is there anything wrong in reviewing the immediate output of special relativity’- time dilation’, which requires a complex mathematics to establish a fourth dimension. So let us begin with the popular moving clocks. Let us consider first about a standing(not moving)clock, which use light rays to measure the time. The rays will start from a source and in a time ‘t’ it hits a mirror just opposite and then in another ‘t’seconds it hits back the source. Let the mirrors are placed at a distance ‘h’ apart. Let the light travel at a constant speed of 299793…

if force = mass x acceleration could any body explain the force on a body moving @ constant speed? since acceleration = 0 ; force = 0 ???????

a rod Mis lying on a horizontal frictionless table.a small mass m travelling along the surface comes with speed v and hits the rod elasticallyly at one end perpendicular to the rod thereby coming to rest.we have to calculate the ratio m/M first we conserve linear momentum mv=MV' :v'=(m/M)v eq(i) since collision is elastic,e=1 ;[v'+w(omega)l/2]/v=1 eq(ii) for eq(iii)we need to conserve angular momentum.but about which point will we conserve itand why???

Hello. I am a student and would like to ask, are there any other uses of micro air vehicles (MAV) besides military purposes?

Thank you, thank you, beforehand. This whole thing is about sound so... First I want to find out, if I have a sound source like a speaker. I want to figure out how far it travels and how much ...I guess vibratory energy it looses due to (I guess it would be called attenution) length of travel in air, then through other material. I can find like the material stuff, but I don't know where to start really.... As you can see I am a bit confused so maybe some can help me out here... Because I can never tell if sound coming from my APT is heard elsewhere, and I hate being anxious all the time but I hate to disturb people too so, If I can figure it all out I …

whilst bored I messing about with NIB magnets and electricity and noticed Movement in the magnet when electrified, further experimentation making a pivot with a nail point as a bearing, it Spins! I`m using DC electricity also, and this is working like a Motor!? yes I realise it middle of March, but this NOT an April fools joke! stick a NIB magnet to a nail head, stick the nail point to an iron plate, that plate is terminal 1 and terminal 2 is the nail body itself touching a wire. it`ll Spin! no I haven`t been Drinking either! it makes no sense to me either, but I cannot disallow the evidence of Mine and My Wifes eyes either.