Mistake Definition and 296 Threads

Let say that a+b=c this can be writtem as 4a-3a+4b-3b=4c-3c by arranging 4a+4b-4c=3a+3b-3c taking out the constants 4*(a+b-c)=3*(a+b-c) So 4=3 The mistake is that ... I'll post it soon. i read this from a notebook of my little brother and i firstly agreed to it but by the time i...

Hi. I want to examine the connection between the Pareto Distribution and the Exponential distribution. According to Wikipedia (en.wikipedia.org/wiki/Pareto_distribution) the Pareto distribution's pdf is f(x; k, x_m) = k x_m^k x^{-(k + 1)} = \frac{k x_m^k}{x^{(k + 1)}} x is the variable, x_m...

Homework Statement a student wearing a frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 45N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 352J? Homework Equations The Attempt at a...

Socialism was not big mistake in popular countries like china , USSR. Are you agree with this ?

(1/3)(b^2+ab+a^2)-(1/4)(b^2+2ab+a^2) = (b-a)^2 -------- 12 I am ok with this but there is am intermediate step shown (b^2-2ab+a^2) -------------- [SIZE="5"](2) 12 I don't see where the multiplication by 2 comes from and it is not shown...

http://blogs.usatoday.com/ondeadline/2008/03/german-surgeons.html

Hello, i got some problem with my recent findings, i like physics but i am complete amateur. I work as informatics, and it came to me lately. It's so obvious that it HAD to be found before and excluded. So i presume i am just stupid and ignorant :) Can You help me with that ? i took some...

http://img88.imageshack.us/my.php?image=img86311lj7.jpg (traverse is a typing mistake i ment transpose) i am given an operator with parameters (the original matrix) and i was told to find for which values of a b c we have the maximal dim ker t and the the maximal dim I am t the person who...

Homework Statement I posted the question on cramster at http://answerboard.cramster.com/physics- ... so you could see the picture. Homework Equations W = qV = kq1q2 / r The Attempt at a Solution I figure out A, B, and C, (which are the x component, y component, and the...

Homework Statement Q] A particle of mass m is moving in a circle of radius r. The centripetal acceleration(a_c = Kt^2), where K is a positive contant and t is time. The magnitude of the time rate of change of angular momentum of the particle about the centre of the circle is...

I have a B.S. in physics from a reputable school with a good GPA, numerous publications in highly reputable journals and I am still not able to get a job anywhere. Hell, I can't even get an interview because very very few jobs want someone with a degree in physics. They want an engineering...

Homework Statement (I haven't got the thing to write equations so this is a little difficult to understand sorry!) Show that the integral of (4x^2 - 1)^-1/2 from 0.625 to 1.3 is equal to 1/2(ln 5 - ln 2) Homework Equations my formula book states: the integral of (x^2 - a^2)^-1/2 is...

[SOLVED] Made a small mistake and can't figure out what to do-->Projectile motion Homework Statement Ball is launched at 62 degrees above horizontal at 22 m/s. What distance does the ball travel? Homework Equations x=x0+vx0t The Attempt at a Solution x0=0 vy0=22 m/s y0=0...

Disney's movie "Ice Princess" mistake? so I watched the movie over the summer... here's word for word out of the script "Now, l'm going to increase the centripetal force by tucking in my arms. This will increase my moment of inertia, so l will spin...faster." so it's been bugging...

Homework Statement A 1.93 kg block situated on a rough incline with 38.2 angle is connected to a spring of negligible mass having a spring constant of 90 N/m. The block is released from rest when the spring is unstretched, and the pulley is frictionless. The block moves 10.9 cm down the...

Referring to the attached drawing: Two rods 3m long. Rod A is moving at 0,866 c from right to left. The pictures are taken from the point of view of rod B. ( 1 )In 1 a ray of ligth reaches the end of both rods. It happens that the reading of the clocks at rod A and rod B is 0. Because v =...

Can somebody explain the reason why the following reasoning is wrong? Considering a source of electromagnetic waves at rest with respect to a reference frame, plus an observer who is approaching it with speed v, he would experience a Doppler Effect. To measure the value of this effect we...

I was wondering if anyone else here received a notification by email telling them they won the Rensselaer Medal, only to receive another email shortly afterwards to receive another saying the email being sent to you was a mistake? I was one of these people, and here is a copy of the email I got...

(Double integral on D) sin[((x^3)/3) - x] dxdy = ? where D={(x,y): 1<=y<=4 , sqrt(y)<=x<=2 }. Okay, we change the order of integration and then we get (Double integral on D') sin [((x^3)/3) - x] dxdy where D'={(x,y): 1<=x<=2 , 1<=y<=(x^2). Thus, we get the one variable integral...

take the function: y = x^x if x<0; it is not defined. However: take this example: x=-3 therefore: y=(-3)^(-3) =1 / ( (-3)^3 ) =-27 HOWEVER: y == e^(xln(x)) ln(x) has a domain: {x>0, x e R} Thus in that respect when x=-3, it is undefined. WHY?

Hi everybody, I have a question concerning a "stupid" thing i did today. I found a electric multimeter (if it is called so- you know, the device that measures dc current, the resistance in Ohms, dc and rms of ac voltage...), and thought to measure my body resistance. I didn't even think that...

mistake in proof of gravitational potential equation? Hi, I have a problem in deriving an equation for the gravitational potential. Well, I think that the graviational potential is the work done by external forces in moving a unit mass Mp from infinity to that point through distance d, and...

Life without music would be a mistake.

Homework Statement π^2 4 ∫ COS(√x) dx 0 Homework Equations The Attempt at a Solution t=√x ; x=t^2 ; dx= 2t π 2 ∫ COSt · 2t dt = [SINt · 2t ] - ∫ 2SINt dt = π +2 0 yes but.. where is the mistake? 'cause the result...

I have a ladder which is propped up against a wall. The ladder slides down the wall and is constrained to move such that the speeeds of the ends of the ladder against the wall (and floor) are a constant value. i.e. \dot x = \dot y = constant The problem question is: What is the angular...

Ok sorry about that, here is the actual problem: g(x)=sq.rt.(2-x) Find the inverse of g(x) ok the answer is -x^2+2, but how come the domain is [0,infinity)??

I think the website speaks for itself: http://www.engrish.com/detail.php?imagename=gentlemen.jpg&category=Engrish%20from%20Other%20Countries&date=2006-04-26" Read the FAQ for any inqueries on its 'political correctness'

:frown: :frown: :frown: Here i would like to post the biggest mistake ever made in physics...unfortunately even greatest and most intelligent men make mistakes or simply don,t tak into account things that could have changed the world of physics or advance the science even 50 or 100 years...:cry...

given: the electric field at a point on the axis a distance x from the plane of a ring is E = \frac {q*x} {4*pi*E0*(x^2+r^2)^{3/2}} where E0 is the permeability coefficient The charged ring is replaced by a circular sheet of charge of radius a a surface charge density sigma. The ring...

Hi all, I've been just solving this one: y' + \frac{y}{x} = 3\sqrt[3]{\left(xy\right)^2}\arctan x The problem is, one of the solutions I got doesn't pass the original equation and I can't find the mistake. Here it is: After substituting z = \sqrt[3]{y} and thus getting 3z^2z' +...

Al-Zarqawi was captured and released by Iraqi(not U.S.) troops.Maybe we shouldn't withdarw troops the Iraqi's can't even keep Insugent leader's in pirson without doing somthing stupid.

You've got to feel sorry for this guy: http://news.yahoo.com/s/ap/20051210/ap_on_bi_ge/japan_botched_trade

An example in my textbook gives \vert \frac{5-x}{5x} \vert \Leftrightarrow \frac {1}{5} (\frac{1}{\vert x \vert}) (\vert x-5 \vert) Is there something I don't know about absolute values that allows \vert 5-x \vert to become \vert x-5 \vert or is this a mistake in the text?

An object starts at time t = 0 with a velocity of v0 = +50 m/s and undergoes a constant acceleration of a = -11 m/s^2. b) How far from its starting (t = 0) position is the object at time t_1? I get 44.5 meters. it sounds right 'cuz the equation would mean 0+50*1 - 11/2 *1^2 = 44.5 meters...

All my life I thought I will be a math teacher (high school). And, then the very last minute I changed, and last week I started my first year studies at the University in the Electrical Engineering Program, did I make a mistake?

I often wonder if the choices I made over my life have prevented me from getting where I dreamed I would be by now. Sadly, given my options and circumstances, I think nothing within my power would have made a difference What about you? Would your life be unimaginably better (or worse) had...

Folks, I'm looking for a minor mistake in my solution. Any help is highly appreciated. "Some diseases (such as typhoid fever) are spread largely by carriers, individuals who can transmit the disease, but who exibit no overt symptoms. Let x and y, respectively, denote the proportion of...

many people seem to believe here you can create a rotational momentum without creating an oposite momentum so they cancel each other if added together they even get so mad at their own ignorance they keep deleting this post all time

It won't work and I don't see what I'm doing wrong. Find the solutions of the following system of linear equations: x + 3y - z = 1 2x + y + 2z = 3 5x + z = 2 I put these into the form Ax = b, where A = (1 3 -1) (2 1 2 ) (5 0 1 ) x = (x) (y)...

The Warrior can take off when its airspeed (speed of the air flowing over the wing) is equal to 100 km/hr. What is the length of runway, in meters, required for the plane to take off if there is a 12 km/hr head wind? Note: the shortest runway at the Rochester International Airport has a length...

"The Matrix" Mistake? In the movie "The Matrix", Neo has feelings that his world is not real. He discovers he is right when he meets Morpheus, who transports him into the “real world” My problem is that Neo all of a sudden stops wondering , and blindly accepts the “real world” as...

I can't seem to get the correct answer but I keep getting very close the question is \int_{0}^{\pi/2}xcos(x)dx this is what I did u=x v=1/2(sin(2x))dx du=dx dv=cos(2x)dx and then i get...

Wilson's mistake, Bush's . . . ? George Washington, a founder of the United States of America, set forth in his farewell address that the 13 colonies should not take part in any squabbles that involved the colonies participation in political wars with other nations (not in its hemisphere)...

I bought a new cell. I never let the power go below 80%. Now the cell(power) has become weak. It can't even withstand for 5mins with full power. What was the mistake i made ? Did i overcharge my cell ? I don't understand the chemistry behind that! Can anybody explain ?

Could it be possible that everything we "know" is wrong? Every law of physics and every discovery that was discovered could be incorrect because the foundation of our science was flawed. Perhaps now, everything seems to be making sense, but maybe one day, we will "get stuck" as we get deeper in...

Due to a comment made in another section, I felt the need to post this information to clear up the most common error people who don't know what evolution is, make about evolution. MISTAKE ONE: Evolution makes no comment, statement, or hypothesis about the origin of life on this planet. So...