Balls Definition and 555 Threads

Edward Michael Balls (born 25 February 1967) is a British broadcaster, writer, economist, professor and former politician who served as Shadow Chancellor of the Exchequer from 2011 to 2015. A member of the Labour Party and Co-operative Party, he was Member of Parliament (MP) for Morley and Outwood, formerly Normanton, from 2005 to 2015.
Balls attended Nottingham High School before studying philosophy, politics and economics at Keble College, Oxford, and was later a Kennedy Scholar in economics at the John F. Kennedy School of Government, Harvard University. He was a teaching fellow at Harvard from 1988 to 1990, when he joined the Financial Times as the lead economic writer. Balls had joined the Labour Party whilst attending Nottingham High School, and became an adviser to Shadow Chancellor Gordon Brown in 1994, continuing in this role after Labour won the 1997 general election, and eventually becoming the Chief Economic Advisor to the Treasury.
At the 2005 general election, Balls was elected as the MP for Normanton (which in 2010 became Morley and Outwood), and in 2006 became Economic Secretary to the Treasury. When Brown became Prime Minister in 2007, Balls became Secretary of State for Children, Schools and Families, serving until the 2010 general election; Labour were at that point defeated after thirteen years in government, and returned to Opposition. He was appointed as Shadow Secretary of State for Education under Harriet Harman and finished in third place at the 2010 Labour leadership election, triggered by Gordon Brown's resignation as Leader of the Labour Party, after which he was appointed as Ed Miliband's Shadow Home Secretary. He served in this role until 2011, when he was then appointed as Shadow Chancellor of the Exchequer, a role that he held until he was unseated at the 2015 general election.
Following his electoral defeat, he became a senior fellow at Harvard University Kennedy School's Mossavar-Rahmani Center for Business and Government, and a visiting professor to the Policy Institute at King's College London. He was appointed chairman of Norwich City F.C. in December 2015, a position he held until December 2018. In 2020 he was appointed Professor of Political Economy at King's College London. Balls was a contestant on series 14 of the BBC's Strictly Come Dancing, surviving until week 10, and in 2021 was the winner in BBC's Celebrity Best Home Cook.

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  1. aturcotte16

    How Do Restitution Coefficients Affect Billiard Ball Trajectories?

    The problem I have here is that I can't see how the restitution coefficients (e) will change the trajectory of the ball since the speed of the ball B will be on the same direction as the normal component. And without information one the ball A, I can't see how to resolve that. I will really...
  2. R

    Solving the Weighing Balls Problem in One Weighing | Precise Scale Method

    Homework Statement Consider a set of boxes, each containing 20 balls. Suppose every ball weighs one pound, except that the balls in one box are all one ounce too heavy or one ounce too light. A precise scale is available that can weigh to the nearest ounce (not a balance scale). By selecting...
  3. liroj

    Terminal velocity of two balls with different masses

    Two objects of the same shape (say balls) fall through the Earth's atmosphere. For simplification, let's say that the air density is the same (some average sea level value) despite altitude change. One ball has considerably bigger mass than the other, but besides that, they're the same. Will...
  4. Mr Davis 97

    I Open balls contained in other open balls

    I am reading a proof that claims that ##\overline{B_{\epsilon /2}(x)} \subseteq B_{\epsilon}(x)##, where the overline means closure, without really explaining why. It's clear to me that ##B_{\epsilon /2}(x) \subseteq B_{\epsilon}(x)##, but I can't quite see why the former is the case without...
  5. M

    The dropping of two identical balls without air resistance

    I was thinking about this and couldn't really figure it out. You are standing on a cliff and you have two identical balls. In this case, air resistance is to be ignored. The only thing different is that you throw the ball horizontally at different speeds. Let's say you threw ball one at a speed...
  6. S

    Rotational moment of inertia for 3 balls on a pipe

    Homework Statement Homework EquationsThe Attempt at a Solution i just don't know from where to take the R which is colored with brown, in the 2(MR^2), what is the R here exactly, because i took the radius of the sphere , but i get different answer althought it's near.
  7. neilparker62

    I How does the motion of colliding billiard balls change under Special Relativity?

    Assuming equal mass billiard balls and elastic collisions, classical physics shows that after any collision the motion of the colliding balls will be orthogonal. How does that situation change under SR ? More generally for an elastic collision between objects m and M with m<M, is maximum angle...
  8. K

    B What Is the Probability of Winning in This Ball Selection Game?

    This problem appeared in a problem set which I encountered on the internet In a game, balls are labeled by integer numbers. One chooses three different integer numbers between 1 and 10. Two balls are picked at the same time, at random from a box. If they are part of the three earlier chosen...
  9. evinda

    MHB Will the balls meet at the same position?

    Hello! (Wave) At a clock (on which we have the positions $1,2, \dots, 12$) we place at position $1$ a blue ball and at position $2$ a red ball. At discrete times ($1,2,3, \dots$) we shift the two balls. Each time we shift the blue ball by three positions and the red ball by one position. Will...
  10. C

    Calculating Charge and Force Using Coulomb's Law and Trigonometry

    Homework Statement Two small balls, each of mass 5.0 g, are attached to silk threads 50 cm long, which are in turn tied to the same point on the ceiling, as shown below. When the balls are given the same charge Q, the threads hang at 5.0° to the vertical, as shown below. What is the magnitude...
  11. J

    3 balls rolling down different-shaped inclined platforms

    Homework Statement which ball reaches at the end of the board first, which ball reaches ground first, which ball would be fastest when reached ground and at the end of the board? heights are same and balls are identical Homework EquationsThe Attempt at a Solution i think since ball rolls...
  12. J

    What is the minimum charge needed for a ball to jump in an electric field?

    I don't really know how to fit what i want to this template, but i'll try. The thing is that i wonder if anyone can explain to me step-by-step what happened in this solution, because i don't really understand it. Homework Statement There are two balls. Upper one(mass m, charge Q) hung on a...
  13. psy

    Calculating distance between charged Balls

    Hello! I have the following problem and attempt for solution. Two equal, small conductive balls hang on two long non-conductive threads attached to a hook. The balls are charged with the same charges and are located 5 cm apart. One of the balls will now be decharged. What is the new distance...
  14. isukatphysics69

    Impulse and momentum problem pool balls

    1. Homework Statement in picture Homework Equations momentuma+momentumb=momentum of system The Attempt at a Solution So i just spent 1 hour trying to solve this problem and got completely stuck when trying to solve for the angle of ball 2 in the final position i ended up with an equation...
  15. Cathr

    I Combinatorics & probability density

    Suppose we have two boxes, each containing three types of balls. On each ball there's written a number: First box: 1, 2, 3 Second box: 4, 5, 6 We don't know how many balls of each type there are, but we know the probability of taking out a specific one, so that we can make a graph showing the...
  16. B

    Hanging pith balls on a thread...charge, Fg, Fe and tension

    Homework Statement Two pith balls each have a mass of 1.0g and equal charges. One pith ball is hung from an insulating thread. The other is fixed at a horizontal distance of 3.0cm from the first, The first hangs at an angle of 30.0° from the vertical. Find: a) the gravitational force on the...
  17. J

    Need help with mechanics exercise - Vertical motion of 3 balls

    Homework Statement So I've been stuck on this exercise for a few hours now, maybe you can help out: 3 balls meet at the same height hm. Ball 1 is accelerated straight up into the air for 1s from height 0. When the acceleration stops, ball 2 is launched straight up from height 0 with v2 =...
  18. B

    B Calculate probability of getting 2 red balls

    Hi, I'm struggling with a basic probability question and I need some insight into this problem. I can solve the problem, but its a really inefficient and time consuming way. The problem: There are 10 blue balls and 2 red balls in a jar. Calculate the probability of drawing 2 red balls if 4...
  19. Manolisjam

    3 balls in a moving mechanics problem

    Homework Statement Consider 2 balls A,B on the same line . and they are connected to a third one G with a rope L. AG, AB. now the system monves in the effect of the mass of G and its projection to the line AB is in the middle. No friction. mass of A=mass of B=m and mass of G=2m .FInd the time...
  20. Manolisjam

    Classical Mechanics Problem with balls

    Homework Statement Consider 2 balls A,B on the same line . and they are connected to a third one G with a rope L. AG, AB. now the system monves in the effect of the mass of G and its projection to the line AB is in the middle. No friction. mass of A=mass of B=m and mass of G=2m .FInd the time...
  21. K

    Probability Problem -- pulling colored balls from a box randomly

    Homework Statement Bob had a box containing 9 green balls and 1 white ball. A Bob's friend removed one ball from the box without telling Bob what was its color. Now what's the probability for Bob picking up one green ball from the box? Homework Equations [/B] Not aware of "formulas", I just...
  22. yaniv arazi

    Projectile motion: Two Balls and Building

    Homework Statement 1.[/B] two balls are thrown vertically from two points on a building. at the bottom of the building ball 1 is thrown and from the roof ball 2 is thrown. ball one reaches its maximum height after three seconds and ball two after one second. after two seconds the balls cross...
  23. haushofer

    I How Many Ways Can You Distribute 4 Indistinguishable Balls into 4 Boxes?

    Dear all, I've always had, for some reason, mental problems with combinatorics. Somehow I'm missing something (a vital brain part or whatever). The situation I want to analyse for myself, is the following. I want to divide 4 indistinguishable balls over 4 boxes. In the end I want to calculate...
  24. Pushoam

    Surface made by balls thrown in different directions

    Homework Statement Homework Equations I consider four directions from the point of throwing the balls, east, west, up, down. At any given time, the balls will be at different distance from this point, (the upward ball will travel less distance than the downward ball). So, it could not be a...
  25. J

    Two balls and a rod colliding with a ball

    Homework Statement Homework EquationsThe Attempt at a Solution The length of the rod is along y direction and (A+B+rod) is traveling along +x direction . Since there is no external force along x direction momentum is conserved along x direction . If v' is velocity of CM of (A+B+P) then 2mv...
  26. M

    Problem set involving Momentum and bowling balls

    Homework Statement Say you're bowling and you roll the ball down the lane. The bowling ball has just knocked the first bowling pin forward and that pin's forward velocity is now much larger than the bowling ball's velocity before their impact. How can the pin travel forward faster than the ball...
  27. Philosophaie

    Spin created due to an Elastic Collision of two solid balls

    In an Elastic Collision in free space with no gravity or friction of two solid balls of radius r1 and r2 I need to calculate the momentum and kinetic energy of the induced spin with angular velocity w1 and w2 to solve for the Conservation of Momentum and Kinetic Energy. Spin Angular Velocity w1...
  28. M

    MHB Two Balls Thrown Vertical Upward

    If an object is thrown vertically upward from a height of h_0 feet with an initial speed of v_0 feet per second, then its height H (in feet) after t seconds is given by h = -16t^2 + vt + h One ball is thrown vertically upward from a height of 50 feet with an initial speed of 40 ft/sec. At the...
  29. A

    Moment of inertia of a rod with balls attached

    Homework Statement Attached. Homework Equations I=mr^2, I=(1/12)m*l^2 for a rod. The Attempt at a Solution Part A I got by doing I=(1/12)3.5*(2.6)^2+2*.7*1.3^2 (I added the moment of inertia of the rod and the balls). Part B since the axis is on one of the balls, I thought we don't include...
  30. M

    MHB A good fairy draws from the lottery wheel two successive balls

    Hey! :o I am looking at the following and need some hints: A lottery wheel contains five red, blue and yellow balls. For each color the balls are labeled with the numbers $ 1,2,3,4 $ and $ 5 $. A good fairy draws from the lottery wheel two successive balls. A ball which has already been drawn...
  31. H

    8 balls how to arrange for adjoining?

    Homework Statement Homework EquationsThe Attempt at a Solution the answer for no adjoining _W_W_W_W_W_ for 3 red balls, there are 6 positions so ## 6C_3 = 20## i'm curious, on other way to find arrangement? for adjoining = all arrangement - adjoining all arrangement = 3 red can get to any...
  32. ShaddollDa9u

    Calculating Post-Collision Momentum and Speed of Two Balls

    Homework Statement Homework Equations I have thought about using the momentum formulas here. The Attempt at a Solution As the momentum is a conservative quantity, I have thought that p (before collision) = p(after collision). Since p (before collision) = 12, I wanted to use that result to...
  33. K

    I Statistical problem of drawing colored balls from boxes

    Last week I went to a state fair which I saw a game of lucky draw. There is two sealed boxes, contains bunch of 4 different color balls: red, blue, green and white. Here is the game rule. Players make an initial draw on box one, if players get a white ball, lose the game; if getting a red one...
  34. GamrCorps

    Conservation of momentum/energy of stacked balls

    Homework Statement A tennis ball and basketball are dropped from a height of 1m (the tennis ball on top of the basketball). The tennis ball has a mass of 75g and the basketball has a mass of 1kg. When dropped separately, the tennis ball bounces to a height of 0.5m and the basketball to a...
  35. W

    How will the two balls move after the collision?

    There are two identical ball,ball A with velocity v and ball B is at rest. Ball A hit ball B directly. How will the two balls move after the collision? In my mind there are three cases: 1. Ball A stops and ball B moves with the velocity v. 2. Two balls move together with same speed v/2. 3. Two...
  36. J

    Elastic collision between pool balls

    Homework Statement A super cue ball is made of the same material with the target ball (radius r) but slightly larger: rc = (3)^(1/3)*r The cue ball collides with the target ball on a frictionless table, as shown below, with initial speed of v0. The collision is not head-on, as shown below. a)...
  37. En Joy

    Constrained Falling of three balls

    Can anyone explain this "mathematically"? i.e. how to calculate the time in each cases?
  38. Z

    Subtraction and division problem: volume of 3 balls in cylinder

    Homework Statement Three identical balls fit snugly into a cylindrical can: the radius of spheres equals the radius of can, and the balls just touch the bottom and the top of the can, If the formula for the volume of a sphere is V = 4/3 PI * radius * radius * radius, what fraction of the...
  39. FallenApple

    Collision of two billiard balls with spin

    Assume both billiard balls have same mass and same radius. So situation 1: ball 1 is moving forward without slipping on a surface and collides elastically with ball 2 which is stationary on that same surface. I read that immediately after the impact, ball 1 stops and keeps spinning with its...
  40. A

    Angular Momentum of colliding balls

    I am currently trying to model collisions of rigid balls. I have successfully been able to calculate collisions that only deal with linear momentum, but have run into trouble when I want to calculate angular momentum (e.g. when ballA glances the top of ballB, both balls should start spinning a...
  41. A

    Distributing N balls in B baskets with equal probability.

    Homework Statement I have N balls and B baskets. I look at each basket i in turn and decide with some probability P_i whether to insert one ball. After N balls are inserted, I stop. If I look through all the baskets B , I stop; I do not make a second run-through, even if all the balls haven't...
  42. nysnacc

    Calculating Coefficient of Restitution for Two Solid Balls Colliding

    Homework Statement Homework Equations MaVa1 + MaVb1 = MaVa2 +MaVb2 The Attempt at a Solution I found Va2 = 2 m/s e is found to be 1.75, correct?
  43. T

    Electric Field Between Two Metal Balls.

    Imagine you have two identical metal balls, each carrying the same amount of charge, but with one ball being positive and the other negative. When you bring them close together, there will be polarization, so you can no longer treat the balls as point charges. How does one find the charge...
  44. DrClaude

    Phase transition in rotating balls

    A very neat video showing a phase transition in rotating balls in a cup. Serves as a good analogy to other phase transions.
  45. Grandma Susan

    Ping-pong balls, Bernoulli, and water

    So I saw the post with the Bernoulli math, but playing with my grandsons in the leisure pool we have observed a ping pong ball released from about 12 inches below clear the surface of the water by an unmeasured inch and a half. And when the twelve year old swims to the bottom of the four foot...
  46. Y

    MHB Solve Probability Problem: An Urn with 5 Black & 4 White Balls

    An urn has 5 black balls ans 4 white balls in it. We randomly choose a ball, and return it to the urn, until we get 2 balls with the same colour. What is the probability that the first ball was white, if we know that the last one was white ? I tried building a tree, and realized that the...
  47. F

    How many ping pong balls would fit into the Great Pyramid?

    The ancient Great Pyramid of Giza had a base of 230.4 meters, and a height of 146.5 meters. A ping pong ball has a diameter of 40 millimeters. The volume of the Great Pyramid = (b^2 x h)/3 = (230.4^2 x 146.5)/3 = 2,592,276 cubic meters. The diameter of a ping pong ball is 40 millimeters =...
  48. K

    How many ways can 12 balls be arranged into 4 different rows

    Homework Statement In how many ways can 12 balls be arranged into 4 different rows with each row having at least one ball (a) if the balls are identical? (b) if there are 6 identical red balls and 6 identical blue balls? Homework EquationsThe Attempt at a Solution a) Put 4 balls in each row...
  49. Amine_prince

    Probability question on buckets and balls

    < Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown > i am doubting my solution to this problem , therefore i hope someone assists me a bit . it's simple , there is a bucket that contains 5 red balls and 3 white balls , a player picks up 4 balls out...
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