Circle Definition and 1000 Threads

Homework Statement A crate (35 kg) is located in the middle of the flat bed of a pickup truck as the truck rounds an unbanked curve in the road. The curve may be regarded as an arc of a circle of radius 80.0 m. If the coefficient of static friction between crate and truck is 0.410, how fast...

Homework Statement Plane stress in xy-plane. Use Mohr's Circle to find σx1 σy1 and τx1y1 if the XY axis is rotated counterclockwise θº I want to do my HW problem myself so I'll just put some sample values. If i know how to get this one, i'll know how to do the HW problem(s). (Units won't...

A truck with a width of 2,40 and height of 3,41 is driving through a tunnel that is formed like a half circle and has the radius of 3,60. Will it work? Now, this is a very pathetic question because this is junior high level geometry. I could blame the incapacity to solve this question on...

Homework Statement A 68.8 g steel ball is attached to the end of a string. The ball is swung in a vertical circle 86 cm in diameter. (a) What is the minimum speed the ball must have at the top in order to complete the circle without falling? (b) If this speed is constant, what will be the...

i tried hard to solve this question but i got a complicated answer any hint ? http://www.gulfup.net/uploads/13634557771.gif thanks

Homework Statement (see attachment 1) In this problem, we have a row of circles placed on a line. All points of tangency are distinct. The circle ##C_n## is uniquely determined. Homework Equations The Attempt at a Solution Here's the sketch I drew for the problem. Radius...

Homework Statement I would like to use the Weierstrass M-test to show that this family of functions/kernels is uniformly convergent for a seminar I must give tomorrow. H_{t} (x) = \sum ^{-\infty}_{\infty} e^{-4 \pi ^{2} n^{2} t} e^{2 \pi i n x} . Homework Equations The Attempt at a...

We typically have z=r*e^(i*theta). But let's say I want a circle centered at 2i. Is it valid to write z=r*e^(i*theta)+2i ? I ask this because I don't want to have abs(z-2i)=r; I want to solve for z.

My curiosity was piqued by another poster who's trying to find the area of a lune using calculus. I wanted to do this now. So I don't highjack his thread, I'm making a new post about it. First, the geometric picture of a lune that constitutes my basic plan of attack. First I want to solve a...

a metric on the plane determines an action of SO(2) on is unit circle by rotation. Suppose one starts with a free transitive action of SO(2) on a circle. When does this come from a metric? Always?

I seem to recall when taking college Trigonometry my professor saying that the unit circle and sinusoidal curves were basically a mathematical represention of a slinky in that the unit circle was the view of a slinky head on, so that what you saw in the two dimensional sense was a circle, and...

arg(\dfrac{z}{z-2}) = \dfrac{\pi}{3} sketch the locus of z and find the centre of the circle I've sketched the locus of z but I can't seem to find the centre of the circle. Is there a way to do it algebraically? I've attempted to use z = x + iy, but to no avail.

Homework Statement Find the center of mass of a 5kg circle with a radius of 4m with a circle that has a radius of 2m cut out from it. Homework Equations The Attempt at a Solution To be completely honest, I do not know where to start. I do know how to find the center of mass when...

Hi, how can I prove that a circle it is not homeomorphic to a subset of R^n I can somehow, see that there isn't any homeomorphic application, for example between a circle in R^2 to a line, but how can I prove it? Thank you

Homework Statement Solve: ∫(-ydx+xdy)/(x2+y2) counterclockwise around x2+y2=4 Homework Equations Greens Theorem: ∫Pdx + Qdy = ∫∫(dQ/dx - dP/dy)dxdy The Attempt at a Solution Using Greens Theorem variables, I get that: P = -y/(x2+y2) and Q=x/(x2+y2) and thus dQ/dx =...

Given a circle centered at the origin, how can one prove that the limit of the quotient of the number of lattice points on the circle over the radius goes to zero as radius goes to infinity?

What is the theory behind mapping of the latitude and longitude of the sphere in the Poincare Circle to the polarization of the TEM wave? That is, why: 1) Linear polarization when ε=0 deg? 2) Circular polarization when ε=+/- 45 deg? 3) Elliptical when ε is not 0 or +/- 45 deg? 4) RH rotation...

Homework Statement What is the area of a right triangle whose inscribed circle has radius 3 and whose circumscribed circle has a radius 8? Homework Equations The diameter must be the hypotenuse of the circle The Attempt at a Solution The answer is 57, but I do not know the...

Homework Statement I solved this problem. I just have a general question at the very end. A current flows in a wire that has straight sections on either side of a semicircular loop of radius b. Find the mag and direction of the magnetic field B at point P(center of loop). ......... periods =...

Homework Statement I was looking at the following tutorial http://mathworld.wolfram.com/Circle.html Homework Equations equations 31-34 o the link The Attempt at a Solution My question is just whether this means that for 31-34, the answers are determinants of 3x3 matricies...

Hi, everyone. I am just trying to do some practice problems on finding volume. So this is the one I'm working on: 1. "Find the volume of the solid described below: The solid lies between the planes perpendicular to the x-axis at x=6 and x=-6. The cross-sections perpendicular to the axis on...

This may sound like a dumb question, but... For the equation of a circle with a radius of 1, the equation is: x^2 + y^2 = 1 But if we rearrange that to be: y= √(1 - x^2), then it's only a semicircle... Why is that? Why is it now a semicircle just because it got rearranged? Thanks!

Hey guys, I hope someone can give me some pointers with this because it should be really easy but I am just not getting it! I want to show that for a triangle inscribedin a circle an equilateral traingle gives the maximal perimeter. I've tried a few things and just get bogged down in algebra...

Homework Statement A particle of mass M is on the top of a vertical circle without initial velocity. It starts to fall clockwise. Find the angle with respect to the origin, where the particle leaves the circle. Homework Equations v=ωXr The Attempt at a Solution I used two unitary...

Homework Statement A is the pt where the circle with wquation x^2+y^2=25 cuts the positive x-axis. Find the midpts of the chords of this circle that contain the pt A Homework Equations The Attempt at a Solution Since it is about the midpt of chords, I try to set up a equation...

This question asks whether every circle bundle comes from a 2 plane bundle. Paracompact space please - preferably a manifold. By circle bundle I mean the usual thing, a fiber bundle with fiber, a circle, that is locally a product bundle. The transition functions lie in some group of...

I would like to calculate (X,Y) coords on a circle with a 10" radius. I have some idea on how this can work but I'm not real solid on it. Say the center is (0,10) and I'd like to solve for Y given an arbitrary X. How would I do this? Obviously (10,0) and (-10,0) and (0,-10) and I know that sin...

I hope this is self-evident to someone, I'm struggling. I have a program that draws circles (n-gons really) of various sizes, but by translating-rotating-translating-rotating-..., not by x=sin/y=cos. That works as intended, but my wish is to offset the circle so that its center is (0,0) in...

Homework Statement Hi i have a circle that is shown by (x-7)2+(y+1)2=20 i also have a line y=2x-5 and i have to explain why the line is a tangent to the edge of the circle i know that the circle has the centre in (7,1) and that the radius of it is 4,4 Homework Equations i know...

A complex series need not be defined for all z within the "circle of convergence"? The (complex) radius of convergence represents the radius of the circle (centered at the center of the series) in which a complex series converges. Also, a theorem states that a (termwise) differentiated...

Homework Statement A variable circle cuts x and y axes so that intercepts are of given length k1 and k2. Find the locus of center of circle Homework Equations The Attempt at a Solution There must be four intercepts but only two are given.

how to calculate the double integral of f(x,y) within the intersected area? f(x,y)=a0+a1y+a2x+a3xy The area is the intersection of an ellipse and a circle. Any help will be appreciated, I don't know how to do this. can I use x=racosθ,y=rbsinθ to transformer the ellipse and...

if we have the circle in the picture given x,y,z the middle line pass through the circle center find the area of the four sectors with respect to x,y,z parallel lines Thanks

This isn't really homework. I'm studying What Is Mathematics by myself. But I'm very stuck on one of its exercises. Homework Statement Prove that if for four complex numbers z_{1}, z_{2}, z_{3} and z_{4} the angles of \frac{z_{3} - z_{1}}{z_{3} - z_{2}} and \frac{z_{4} - z_{1}}{z_{4} -...

Hi I'm trying to study over break, this isn't an exact quote but its the part of the problem I need help with. Thanks. Homework Statement Draw the unit circle and plot the point P=(3,2). Observe there are TWO lines tangent to the circle passing through the point P. Lines L1 and L2 are...

Homework Statement Calculate the integral ∫dθ/(1+acos(θ)) from 0 to 2∏ using residues. Homework Equations Res\underline{zo}(z)=lim\underline{z->zo} (z-z0)f(zo)*2∏i The Attempt at a Solution To start I sub cos(θ)=1/2(e^(iθ)+e^(-iθ)) so that de^(iθ)=ie^(iθ)dθ Re-writing in...

Homework Statement A car is being driven around in circles. The radius of the circle being made is R = 150.0 m. At t = 0, the car is on the left edge of the circle (therefore it is in the −x direction away from the center of the circle if your origin is placed at the center), and it is...

\begin{tikzpicture} \draw (0,0) circle (1cm); \end{tikzpicture} How do I add directional arrows going counterclockwise on the circle?

Homework Statement Find the definite integral of a quarter circle. Homework Equations x^2 +y^2=10 The Attempt at a Solution x^2=10-y^2 x=sqrt(10-y^2) ∫ sqrt(10-y^2)dy from 0 to sqrt(10) I'm not sure what to do here.

The circle x^2 +y^2 -4x+2y+m=0 is tangent with the line y=x+1.Find m. p.s : I know that o should solve it from the equations of two lines but i really get confused when i [FONT=sans-serif] substitute the y :/ . Thanx :)

I'm working to calculate the cross-sectional area of a lathe turned feature machined with a radiused insert. My calculations have essentially led me to the equation for the area of a segment of a circle. Area=r^2/2*(∏/180*C-sin(C)) where r is the circle's radius and C is the central angle...

Homework Statement A small car with mass .800 kg travels at a constant speed of 12m/s on the inside of a track that is a vertical circle with radius 5.0m. If the normal force exerted by the track on the car when it is at the top of the track is 6.00N, what is the normal force at the bottom of...

A portion of a homework problem was given me to solve for practice. I have solved some but not all of the homework problem and I hope you all can help. Here is the problem: 1. For each x \in R it is conventional to write cis(x) = cos(x) + i sin(x). Prove that cis(x+y) = cis(x) cis(y)...

Continued from; Originally Posted by Jameson http://www.mathhelpboards.com/f2/understanding-how-deal-fractions-using-brackets-2596/#post11674 What is the full problem you are trying to solve? I can't make sense of your post until I know that. I have a circle problem and am trying to find...

Hi all, I have a question about the Unruh effect. I've read that a detector will only register the effect (i.e., the thermal bath) when the Rindler horizon is visible - in turn, a detector accelerating in a circle (changing direction but not speed) would not measure the thermal effect...

1(a) Homework Statement A spaceship travels in a circular orbit around a planet. It applies a sudden thrust and increases its speed by a factor f . If the goal is to change the orbit from a circle to a parabola, what should f be if the thrust points in the tangential direction? 1(b) Is...

A 0.8 kg ball is whirled on a string r = 0.4 meters long in a vertical circular path. At the bottom of the circle, the ball is h = 0.45 meters from the ground. At the top of the circle, the ball has a speed of 3 m/s. Assume that the total energy of the ball is kept constant. a. Calculate...

Homework Statement Points A B and C lie on the circumference of a circle where $$A =(-3,2)\\B=(-1,6)\\C=(7,2)$$ Show that AC is the diameter of the circle. Homework Equations The Attempt at a Solution Would it be sufficient to show that the angle ABC is a right angle and therefore...

Hi Wasn't sure where to post this, hope it's ok in here! I've gotten myself very confused as to how to find the minimum yield strength for an element. I have used Mohrs circle to find sigma1 and sigma2, then plugged that into the von mises equation to find sigma-von = 636.8MPa. The...

Homework Statement Suppose that n points are independently chosen at random on the circumference of a circle and we want the probability that they all lie in some semicircle. Let ##P_1...P_n## denote the n points. Let A denote the event that all the points are contained in some semicircle and...