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. D

    Probability when seleting balls from an urn

    Homework Statement There is total of 300 balls in the basket, 30 of them is red (rest is white). If we picked up, randomly, 4 balls, what is the probabilty that all of them is red ? 2. The attempt at a solution For one picked ball, probability that it's red is 30/300 = 1/10. If...
  2. S

    Does a Rolling Cylinder Have One or Multiple Angular Rotations?

    If a cylinder is rolling without slipping, C is the centre of zero velocity for a moment and O is the centre Does the angular rotation about O equal to the angular rotation about C, or is there only one angular rotation when a cylinder is rolling, that is the rotation about the point of...
  3. W

    Need precise and perfectly balanced balls fabricated, any ideas where?

    I am working on a hobby project. I need 2 perfectly spherical, perfectly balanced, pure metal (ie. pure titanium, aluminum, etc.) balls made, and then I need one (the larger one) to be precisely drilled through the center. It is essential that everything is done in an extremely accurate manner...
  4. I

    Plasma balls and Fluorescent Bulbs

    Homework Statement I know about Plasma Balls (generally) from this site: http://www.4physics.com/phy_demo/plasma1.htm But I need to somehow explain what is occurring in this demo where a fluorescent bulb is lit up when in the vicinity of the plasma ball: Homework Equations None that...
  5. A

    2 swinging balls (pendulum) problem

    Homework Statement A pendulum of mass m_1 is released at an angle theta_1 and strikes the pendulum of mass m_2, which rises to angle theta_2. The coefficient of restitution e for the two masses is given. Derive an expression for the angle theta_2. Homework Equations KE_1+PE_1=KE_2+PE_2...
  6. T

    Electric field, charged balls, conservation of energy, velocity

    Homework Statement near the surface of the Earth there is an electric field of about 150 V/m which points downward. 2 identical balls with mass 0.540 kg are dropped from a height of 2.0 m, but one of the balls is positively charged with q1 = +650 uC and q2 = -650 uC. use conservation of...
  7. D

    Probability question - Bayes' Theorem - 4 Balls, 2 white, P(all white) = ?

    Homework Statement A Bag contains 4 balls.two balls are drawn at random,and are found to be white.what is the probability that all balls are white? Homework Equations P(B/A) = P(A intersection B) / P (A) The Attempt at a Solution A = Two balls are white. B = All four balls are...
  8. R

    Post-Impact Speed of Colliding Billiard Balls

    Homework Statement Two billiard balls, one heading north at 15.0 m/s and a second heading south at 10.0 m/s, collide head-on. Take the collision to be perfectly elastic and choose the positive direction north. What is the post-impact speed of the first ball Answer: m/s What is...
  9. S

    Angle between two pool balls in an elastic collision

    Homework Statement Consider an elastic collision (ignoring friction and rotational motion). A queue ball initially moving at 2.6 m/s strikes a stationary eight ball of the same size and mass. After the collision, the queue ball’s final speed is 1.2 m/s. Find the queue ball’s angle (theta)...
  10. R

    A rod with two balls on each side - what do the scales on each side show?

    Homework Statement There's a rod, 1 m long and by itself weighing 1 kg, with two balls attached at each of the sides, one weighing 2 kg, and the other 4 kg. The balls are put upon two scales. What force is applied upon each of the scales (e.g. what do the scales show)? Homework Equations...
  11. D

    Permutations and Combinations Question | Unlimited balls of 4 varieties |

    The questions is pretty short... The source was a chat session and hence the simple sentence. I am stuck with this and thought that Homework Help doesn't attend out of the way questions and so I'm asking them here.
  12. qspeechc

    Compact Sets, Unit Balls, Norms, Inner Products: Delightful Reads

    Hi everyone. I wasn't really sure where to put this thread so I stuck it here, which seems the closest fit. Anyway I've been thinking about this for too long: what characterises the unit ball of a norm? Let's be specific: consider a finite-dimensional vector space, which may as well be...
  13. K

    Elastic collision with 3 pool balls

    Homework Statement A pool ball with initial speed v is aimed right between two other pool balls (looks like: 0 -> : if the semicolon were two balls and were touching each other). If the two right balls leave the elastic collision with equal speeds, find the...
  14. H

    The collision of billiard balls.

    Hi guys, first time in this forum. seems legit. I'm in year 12, i have to find or make a EPI (prac) to do with one of these topics. 1. Co-efficient of friction between different surfaces. 2. Strength of nylon/cotton/steel/tin string. 3. Projectile motion. 4. Bending of a beam. 5. The...
  15. A

    Three Pool Balls Homework - Find Final Velocities

    Homework Statement A pool ball with initial speed v is aimed right between two other pools balls. If the the two right balls leave the elastic collision with equal speeds, find the final velocities of all three balls. Homework Equations Equations for Energy and Momentum conservation...
  16. A

    Maximizing Space: Estimating the Number of Ping-Pong Balls in a Room

    Homework Statement Estimate the number of Ping - Pong balls that would fit into a typical-size room (without being crushed). In your solution state the quantities you measure or estimate and the values you take for them. (Assume 25% of the space cannot be filled due to spherical packing.)...
  17. N

    Counting Balls in Boxes: Finding Solutions with Upper-Bound on Number of Balls

    Homework Statement Specifically, How many ways can you divide up 20 distinct balls into 5 distinct boxes so that no box contains more than 10 balls? Homework Equations This is similar to another problem in which we have to find the number of ways to divide up r balls into k boxes...
  18. K

    Decreasing sequence of closed balls in COMPLETE metric space

    Homework Statement Give an example of a decreasing sequence of closed balls in a complete metric space with empty intersection. Hint 1: use a metric on N topologically equivalent to the discrete metric so that {n≥k} are closed balls. In={n,n+1,n+2,...}. Homework Equations N/A The...
  19. L

    Height of the two balls collision

    Homework Statement Ball A is dropped from the top of a building of height 'h' at the same instant that Ball B is thrown vertically upward from the ground. When the balls collide, they are moving in opposite directions, and the speed of A is twice the speed of B. At what height does the...
  20. B

    Speeds of tennis balls after collision

    Homework Statement A 0.0600 kg tennis ball, moving with a speed of 2.50 m/s, has a head-on collision with a 0.0900 kg ball initially moving away from it at a speed of 1.00 m/s. Assuming a perfectly elastic collision, what is the speed and direction of each ball after the collision...
  21. D

    Probability - Drawing balls from boxes

    box A has place for 2 balls, box B has place for 3 balls balls are placed randomly in each of the boxes until one of them is full if X is the amount of balls used, find: E(x) var(x) i drew the boxes and think there are only 3 options,,, X=[2 3 4] BOX A --- BOX B I) 2 balls...
  22. D

    Probability of 4 balls in trash can

    4 balls are placed randomly into 10 bins, what is the probability that exactly 8 of the bins will be empty?? first i need to find out how many ways i can place the balls into the bins --> 10*10*10*10=10000 now i need to find how many ways the balls can be placed so that there are 8 empty...
  23. U

    Proving A is Open: Union of Open Balls

    Homework Statement Let (X,d) be a metric space and let A be a non-empty subset of X. Prove that A is open if and only if it can be written as the union of a family of open balls of the form Br(x) = {y ∈ X|d(x,y) < r} (the radius r may depend on the point x). Homework Equations...
  24. M

    Spring mass spring mass spring - 2 balls oscillations

    http://fatcat.ftj.agh.edu.pl/~i7matras/hej.jpg Both masses are in point. I need to count displacement x(t) but I don't know how to write derivative equations? Could someone help? Or at least give me a tip?
  25. P

    How Do Hurricane Balls Achieve High RPMs?

    Physics of "Hurricane Balls" Two ball bearings are welded together, placed on a mirror, and blown upon using a straw. The RPM's reportedly can reach 10,000 rpm's. There are numerous vid links, here's one: http://www.liveleak.com/view?i=d5c_1179564591 Anyway, I know this can also be done...
  26. S

    Why Don't 8 Balls Move after Collision?

    Suppose there are 8 balls in line on a horizontal table. Another 2 balls collide them from left side(both approach together) with velocity v. The last 2 balls(from right) get knocked off with the same velocity as that of the balls that approached first.Why don't all the 8 balls move with a...
  27. Y

    Curve balls and Bernoulli's principle

    It has always been explained to me that balls curve because a thin layer of fluid adheres to its surface as a boundary layer. This boundary layer retards the flow on one side of the ball and speeds it on the other. And then Bernoulli's principle is applied to make the pressure difference happen...
  28. D

    Open set is countable union of disjoint open balls

    In R, every nonempty open set is the disjoint union of a countable collection of open intervals. (Royden/Fitzpatrick, 4th edition) What is the most general setting in which every open set is a disjoint union of countable collection of open balls (or bases)? In R^n? In metric spaces? In second...
  29. R

    Playing with magnetic balls, and now I have a question

    I was spending an incredibly exciting Friday night playing with some magnetic "bucky balls" that I got from thinkgeek yesterday. As I am playing with the balls (heh), I have them aligned where I have two sheets, with opposing force. and I was pressing them together imagining the particle...
  30. L

    Determine the balls initial velocity

    Homework Statement Question Reads: " A passenger in a hot air balloon throws a ball with an innitial unknown velocity. the ball accelerates at 9.8m/s down for 2.0s. at which time its instantenous velocity is 24m/s [45 below the horizontal]. determine the balls innital velocity "...
  31. W

    Finding Speed of Projection for Two Balls Collision

    Homework Statement A ball was projected at an angle A to the horizontal. One second later another ball was projected from the same point at an angle B to the horizontal. One second after the second ball was released, the two balls collided. Find the speed of projection for the two balls...
  32. D

    What is the probability of selecting a white ball from a box?

    Homework Statement A box has 10 bass, 6 are black and 4 are white. Three balls are removed from the box, color unknown. Find the probability that a fourth ball removed will be white. Homework Equations The Attempt at a Solution I got: \frac{4}{10} * \frac{3}{9} * \frac{2}{8} * \frac{1}{7}...
  33. G

    Acceleration of Falling Balls on Elastic Bands

    Homework Statement Two small balls with masses 3M and M hang on elastic massless rubber bands (with the M ball attached to and suspended beneath the 3M ball with one rubber band; the 3M ball is suspended from the ceiling by a separate rubber band). When the band between the balls is cut...
  34. S

    Solve Rotational Friction Problem with Steel Rod & Balls

    Homework Statement Attached to each end of a thin steel rod of length 1.00 m and mass 6.80 kg is a small ball of mass 1.15 kg. The rod is constrained to rotate in a horizontal plane about a vertical axis through its midpoint. At a certain instant, it is rotating at 43.0 rev/s. Because of...
  35. M

    Concept of 3 balls falling from building at different angles

    If a ball is thrown upwards, another straight out, and another downwards, which will reach the ground with the highest velocity? After thinking about this for a while my conclusion is that they all will have the same velocity since they all have the same initial gravitational potential energy...
  36. M

    The time take to two balls (gravitationally attract), to reach each other

    two balls with known mass, radios, and distance between each other, are attract, due to gravitational force. how much time will it take them to reach each other? this is NOT homework... just something i thought about, and have no idea how to solve. (pay attention the mass and radios of each...
  37. D

    What is the relationship between velocity and momentum in collisions?

    I am a little lost on where to begin with this problem. In my mind, it has something to do with a 90 degree angle, so it would require the use of sin or cos. But I may be wrong. Any help would be appreciated. It is due tonight. Problem: A 20 g ball of clay traveling east at 4.5 m/s collides...
  38. R

    Calculating Heights of Swinging Balls Colliding

    Homework Statement Two small balls are suspended side by side from two strings of length L so that they just touch when in their lowest positions. Their masses are m and 2m, repectively. If the left ball (of mass m) is pulled aside and released from a height h, it will swing down and...
  39. A

    Probability question: blue and cyan balls in an urn

    An urn contains b blue balls and c cyan balls. A ball is drawn at random, its colour is noted, and it is returned to the urn together with d further balls of the same colour. This procedure is repeated indefinitely. i) What is the probability that the second ball drawn is cyan? ii) What is...
  40. V

    3 balls are launched off a tall cliff with the same initial velocity

    which will strike the ball at the fastest speed? -one launched upward at a certain angel -one launched downward -one launched perfectly horizontally I am guessing 1, since it has the additional height to fall under gravity influence
  41. N

    Seeking Help with Three Small Balls on a Smooth Surface

    Hi everyone, this is a problem I posted here a month ago but it wasn't given any attention from the helpers here. I still cannot solve it. So I will greatly appreciate any help. 1. Homework Statement Three small balls of masses m, 2m and 3m are placed on a smooth horizontal surface so that...
  42. K

    2 suspended balls with charge q. find q

    Homework Statement Two Styrofoam balls with the same mass m = 7E-8 kg and the same positive charge q are suspended from the same point by insulating threads of length L = 0.92 m. The separation of the balls is d = 0.024 m. What is the charge q? I am unable to add a graphic at this time...
  43. J

    Coulombs Law of two metal balls

    Homework Statement Two metal balls A and B of negligible radius are floating at rest on Space Station Freedom between two metal bulkheads, connected by a taut nonconducting thread of length 1.30 m. Ball A carries charge q, and ball B carries charge 2q. Each ball is 1.66 m away from a bulkhead...
  44. T

    How Do Electric Balls Approach Each Other as They Lose Charge?

    Homework Statement Assume each ball is loosing charge at a rate of 1.20nC/s, as what instantaneous relative speed do the balls approach each other initially. m=11.2g L=122cm x=4.70cm http://img40.imageshack.us/img40/9708/electballs.jpg Homework Equations I figured since the value...
  45. M

    How many chocolate balls do you need to melt?

    Homework Statement A recipe calls for 1.75cups of melted chocolate. All you have in the cupboard are solid chocolate balls measuring 5/16inch in diameter. How many chocolate balls do you need to melt? ( V_{sphere} = \frac{4}{3} \pi r^3 ) The Attempt at a Solution The attempt is...
  46. I

    Experimenting Mechanics: Two Balls, Same Time - Glilio Glili

    Hallow I want to know why if I throw 2 balls and one ball is bigger and whit more mass Why the two balls arrive to the ground in the same time This is the experiment of glilio glili Also I search after more experiment in mechanics (physics) like this Or like this experiment - if I throw a...
  47. Borek

    Playing with Balls: Fun for Kids of All Ages

    https://www.youtube.com/watch?v=yxHrLzvUNZc
  48. B

    Probability of taking different colored balls out of a jar

    Homework Statement You are given a jar with 9 balls in it. 4 of which are red, 3 are green, and 2 are blue. The 9 balls are taken out of the jar one by one. What are the odds that the first 3 balls have 3 different colors? What are the odds that the last 3 ball have 3 different colors...
  49. R

    Is Velocity Conserved in a Falling Balls Collision Experiment?

    Hi there, can anyone help me with this problem, I'll be grateful to received your help. It was like this, we were doing an experiment on collision and this is how it goes; We place a ramp on table and a sheet of paper at the bottom of the table but close to the edge. Then we put two...
  50. B

    Coefficient of Restitution between two balls

    Hi All, I conducted some experiments on snooker balls and am trying to find the coefficient of restitution between the balls. For the sake of the experiment, I have stated that the balls are sliding rather than rolling, and from an earlier experiment, I have discovered that there is a...
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