Figure Definition and 590 Threads

Error Analysis/Significant Figure help please! Hi Physics Forums, I have an assignment due very soon and I have completed everything, bar error analysis. I have been told that we need to calculate relative and absolute errors or something along those lines and I have NO IDEA what I am doing...

Hi, I've tried several times to get my head around this, but every way I look at it Hawking Radiation doesn't seem to fix the thermodynamic issues it was supposed to solve. People who are a lot smarter than me seem to believe it's real, so can someone please point out where I'm going wrong...

Homework Statement A represents the 1st quadrant area bounded by f(x)=e^(-tanx), y=.01, y=.09, and the y-axis. Write an integral expression for the volume of the figure that results from revolving A around the line x=30. Homework Equations The Attempt at a Solution So, I know that I have to...

Homework Statement The figure shows a PV diagram for 2.69 mole of oxygen gas in a sealed container. The temperature of state 1 is 21 C. Pressure is Pi. What is T3 and T4? http://s74.photobucket.com/user/teysure/media/phyiscs.png.html?sort=3&o=0 my attempt at solving the solution...

Im trying to set up a spread sheet for my chef but I am stuck. Cell B2 = invoice total Cell C2 = chemical total Cell D2 = Sum(B2-C2) Cell E2 needs to be...if cell d2 < 4000 then multiply by 1%, if 4000 or greater multiply by 2%. Im very stuck on E2 and can't figure out how to make a...

Direction of current in the figure?? Homework Statement What must the emf in the figure be in order for the current through the 7.00-ohm resistor to be 1.76A? Each emf source has negligible internal resistance. Figure...

Homework Statement The figure below shows an object on an inclined ramp of mass 1.30 kg. The angle of the inclined surface is 25° with the horizontal. The object on the ramp is connected to a second object of mass 2.98 kg on a horizontal surface below an overhang that is formed by the...

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Homework Statement If a diameter of 15.5 +/- 0.1mm has been quoted and you need to turn this to a percentage error you get (0.1/15.5)*100 = 0.645... so you would quote this as a percentage error of 0.6% If it was 15.3 +/- 0.1mm and again you wanted percentage error (0.1/15.3)*100 =...

Homework Statement Hello all, So I am working on my engineering project, and my professor told us to play with the graphs,and try to find something interesting about them. So what I want to do is form a better fit for the figure below. " figure 2b" , and find out why the choose not to...

http://www.youtube.com/watch?feature=player_embedded&v=8SDKV29NPaEAt minute 1:42, he says: ...depending on their xxxx biology, not the particular symptoms that they have Could you tell me what is xxxx ? (I can't figure out the word he says). Thank you. (I guess it is "disease" but...)

Edit: Nevermind, solved it. Homework Statement A ceiling fan with 80 cm-diameter blades is turning at 60rpm . Suppose the fan coasts to a stop 25 s after being turned off. What is the speed of the tip of the blade 10 seconds after being turned off? Through how many revolutions does the fan...

Why the figure of eight is not a manifold? I have read somewhere that if we remove the crossing point than the the figure of eight becomes disconnected, but by removing one point in \mathbb{R}^2 it's still connected. Is there any other proof without removing the crossing point?

Homework Statement The vertices of a figure are given by A(-8, 4, -2), B(-6, 3, 5), and C(-10, 5, -9). What type of figure is ABC? Why?Homework Equations pythagorean theorem: |AB|=√(x^2+y^2+z^2)The Attempt at a Solution I first found the vector AB, BC, and CA by subtracting the components of...

Homework Statement \sum ftom n=1 to \infty (-2)n/nn. The Attempt at a Solution limn->\infty | (-2)n+1/(n+1)n+1) x nn/(-2)n | = |-2|limn->\infty |(n/n+1)n*(1/n+1) | If it were only (n/n+1) then would the answer be 2e? Either way, how do you sole this the way it is?

Hi all, I'm a complete math idiot and was wondering if somebody could help me out with an equation that I'm trying to solve. Lets say I have the following percentages that equal 100% 24.57% 44.59% 3.64% 18.20% 9% Now let's say I want to remove the 9% but I want the remaining 4...

I have a question about diffrence between ways of defining a certain plate like (3^1/2)x+y+17.3=0 to MCNP code .for example I know we can define it to MCNP with 15 p 3 2 0 6 but I couldn't understand this method 15 10 0 5 8.66 0 10 0 1

[Java] Can't figure out this "Illegal start of expression" error From my Java code: [FONT="Courier New"]while (info.substring(j, j)) != " ") { name += info.substring(j, j); j++; } gives an "illegal start of expression" error

say your are giving the acceleration as a=2x and you know it has an initial velocity of 5m/s at x=0,t=0 How the heck do you find the position as function of time?? It seems so simple but really has me stumped. It must be possible. I have played around with vdv=ads and integrated trying to...

converting a figure into hours! simple really I got a figure of 70.86 which is calculation to 24 hours so its 70 hours something. So if it was 12 pm on the tuesday plus the amount above, what time and day would it be?

Please help me figure out what this graph is called! My teacher made us copy down this graph which represents both the kinetic energy and gravitational potential energy of an mass due to its its distance away from the centre of the earth. The graph takes the form of a gravitational potential...

http://img138.imageshack.us/img138/7113/conewithflattip.png Help needed, I need an expression of the figure in the picture, it is like a conic but the tip is not a point but a short 1D segment (it s not a truncated conic), I accept anything ;-) skewed Conics, Sperical Harmonics approx, cubic...

I've been wanting to learn physics for a while, and bought an intro book and read through it. Now I want to move onto some higher level physics and am having some problem with the math. My book glosses over how to write out field point vectors, and I don't really understand it in various...

Homework Statement http://ima.cs-gamers.com.ar//images/490matjhs.jpg I have to calculate the surface from the object and the angle alpha. Homework Equations A_{triangle} = \frac{b * h}{2} \frac{a}{\sin \alpha_1} = \frac{b}{\sin \alpha_2} Pythagorean Theorem The Attempt at a Solution...

Homework Statement Homework Equations Sin θ = Opp/Hyp Cos θ = Adj/Hyp The Attempt at a Solution I tried to reverse it, but I couldn't figure it out without the angle θ

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Hi guys. I'm trying to figure out how much water force is needed to push an object roughly 19 times heavier then itself. I think water is roughly 2lbs in weight to every 32 fluid ounces. any one think they can give me a hand?

Two ropes are connected to a steel cable that supports a hanging weight as shown in the figure: http://tinyurl.com/93c6tn3 There are 4 forces T1: Tension force of the left rope T2: Tension force of the right rope T3: Tension force of the steel cable And an unlabelled vector Draw a...

Homework Statement Determine by using steamtables for 2kg of steam - Boiling point if pressure is 5MPa - pressure if the boiling point is 195°C - enthalpy of evaporation at pressure 2800kPa - total elathapy in MJ required to produce 2kg of wet steam with dryness factor of 0.7 at a pressure...

Exists in mathematics a geometric figure, with straight lines (rectangle, parallelogram, or so), allowing you to determine the circumference and area of a circle by drawing / calculating / approximating? Without pi or formulas. So figure with no curved lines (and no polygons). for instance...

Hi, I did a search in the forums and found a similar problem, but nothing on this particular one. I have a problem asking for a procedure to find the number of toothpicks in any figure in a sequence, with an illustration that shows the first three figures of the sequence of triangles built with...

Hi, I am struggling with the following question: How many tosses does it take for a mathematician to figure that a coin is biased? I think that it is impossible. Here is my logic. Assume that there is a biased coin, which always comes up heads and that the mathematician is testing the...

Homework Statement A manufacturing company finds that it makes a profit of $20.00 on each article if 600 or fewer are made each week. The profit decreased by 2 cents per article over 600. How many additional articles should be produced per week in order to realized the maximum point...

If a particle's position is given by x = 4-12t+3t^2 (where t is in seconds and x is in meters). a) What is the velocity at t = 1s? Ok, so I have an answer: v = dx/dt = -12 + 6t At t = 1, v = -12 + 6(1) = -6 m/s but my problem is I want to see the steps of using the formula v = dx/dt...

Pressure of water in upside down cup We all played with a cup in a body of water, you know when you put it in water, turn it upside down and lift above the water level and the cup holds the water in, until you get above the water surface... So say you did that in a fish tank, could the fish...

Homework Statement In the figure below, six charged particles surround particle 7 at radial distances of either d = 1.0 cm or 2d, as drawn. The charges are q1 = +8e, q2 = +8e, q3 = +e, q4 = +8e, q5 = +8e, q6 = +4e, q7 = +4e, with e = 1.60 10-19 C. What is the magnitude of the net electrostatic...

Clever compound cartoon...Dying to figure out the formula to calculate the ink used. There is a strange compound nature to this that I can *almost* calculate. This is just something nagging at me. Take a look at this (IMHO) extremely clever cartoon...

Hey guys, this isn't a homework question or anything. I ended up lugging a lot of wood the other day and decided I would try to figure out on my own how to find out how many calories I burned. I have a ton of data, but I'm just going to show you what I have done via this picture; hopefully...

I am trying to figure out how much force i need to pull to drag an object with a given surface 1634 square inch and weight from a given depth. Between 100 - 200 m 11-21kg psi. However I do not know how to use Newtons laws correctly in this senario. The object does not the to accelerate. Can you...

I need to verify the given identity. I've tried every which way i can think of, but can't figure this one out. I am self-studying this book "College Trigonometry 5th Edition by Aufmann. This is exercise set 3.3, problem 63. cos^2(x) - 2sin^2(x)cos^2(x) - sin^2(x) + 2sin^4(x) = cos^2(2x)...

Dear all, I generate some MATLAB figures that I want to print as eps. The figures look fine in the .fig format. When I open the eps, there is a problem. Wherever there is a vertical line (or part of function) the line shows tiny saw-teeth. I would like to attach I file but it seems one can't...

Where can I read "Essay on the Figure of the Earth"? Apparently Lord Kelvin wrote a supposedly very original essay at the age of 15 (and won a gold medal for it from some university) titled "Essay on the Figure of the Earth". However, I can't seem to find it anywhere. How do I go about finding...

In the picture to the left they're summing up the potential energies but I don't understand why they equal to (Q^2)/2C. Almost like both of them put together is like a giant capacitor? Not sure how they got this any help would be appreciated. This is coming from the book University Physics 13e...

Hi guys this has probably been asked before but i can't seem to find something exactly the same. pics will show you a filter and my small fish pond... water travels up in the blue drum, then up into the overflow which is 4" vertical pipe... then out the side and from 4" to 2" pvc... it...

Now, most lottery corporations publish their numbers picked and the number of people who matched them. They also publish their total sales as well. e.g. numbers A B C D E F G Match all 6: A B C D E F G = 2 winners Match 5 of 6: A B C D E F, A B C D E G, A B C D F G, etc = 10 winners Match 4...

So I need a formula that calculates -1,-1,+1,+1,-1,-1,+1,+1,... for a value of n that is not a piece wise. So far I have come up with (-1)^[2n/3] but I don't like using greatest integer I also did: [cos(n × ∏)]! The notation is not setup correctly and anyone that knows how to do it...

Can't figure out my mistake in calculating volume I'm trying to calculate the volume of {(x,y,z)|x^2+(y-1)^2<1, 0<z<\sqrt{4-x^2-y^2}}: \int_0^{\pi}d\theta \int_0^{2sin(\theta)}\sqrt{4-r^2}rdr=\frac {-1}{3}\int_0^\pi ((4-4sin^2\theta)^{3/2}-8)d\theta=\frac{-8}{3}(\int_0^\pi...

Homework Statement a 20kg block rests on a horizontal surface and is attatched to a mass of 3.5kg by a cable,the pulley is frictionless ans the coefficient of static frition is 0.2 prove that the mass is not suffcient to start the block moving,what is the additional mass that would be...

Well, I am now trying to figure out a single variable expression for Sin. I have a couple ideas using some pieces of geometric formulas I have played with recently but this is still new to me. I'm not talking about sin x, but an algebraic expression for the sin wave. Any thoughts?

So I am very interested in physics but cannot always grasp all the topics fully, so I decided I would get help with this from others. First, I play football and am more of a student of the game than athletic. So I was thinking about the way a person throws a football. Given the footballs shape a...