Balance Definition and 490 Threads

New Balance (NB) is an American sports footwear and apparel brand that was established in 1906. The brand was originally associated with the New Balance Arch Support Company. Today the brand is associated with New Balance Athletics, Inc., an American multinational corporation and its parent New Balance, Inc., a Jim Davis owned holding company that owns New Balance Athletics, Inc. New Balance Athletics, Inc. and New Balance, Inc. are both based in the same headquarters located in Boston, Massachusetts.
New Balance is one of the world's major sports footwear and apparel manufacturers and maintains a manufacturing presence in the United States, as well as in the United Kingdom for the European market, where they produce some of their most popular models such as the 990 model—in contrast to its competitors, which often manufacture exclusively outside the United States and Europe. As a result, New Balance shoes tend to be more expensive than those of many other manufacturers. To offset this pricing difference, New Balance claims to differentiate their products with technical features, such as blended gel inserts, heel counters and a greater selection of sizes, particularly for very narrow or very wide widths. The company has made total profits of approximately $69 billion since 1992.

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  1. MexChemE

    Non-dimensionalization of the energy balance

    Good evening people of PF! I have recently encountered a problem from Himmelblau's Basic Principles and Calculations in Chem. E. which asks to set up an energy balance for a tank, and then non-dimensionalize the differential equation before solving it. It's not the most complex task, but it's...
  2. N

    Errors in basic current balance experiment?

    Hi guys, so I'm having a little trouble completing my physics lab report here due to not being able to find many errors to discuss about. The experiment that I conducted makes use of a basic current balance: http://www.pasco.com/prodCatalog/SF/SF-8607_basic-current-balance/ As you all know...
  3. JuanC97

    Classical mechanics - Energy balance confussion

    Hi everyone. I'm confused with the balance of energy in this situation (I'm comparing the mechanical energy, initially, at rest, at a height = h, and then, at the end, at height = 0). It doesn't seem to be fine, maybe I missed something. I'd appreciate some help - Everything is in the .jpg...
  4. M

    MHB Find the force and the torque so that the cylinder is in balance

    Hey! :o At the cylinder of the picture there are static pressures from environment fluid of density $\rho$. If we neglect the atmospheric pressure, calculate how much force and how much torque is needed so that the cylinder balance. In my notes there is the solution, but I haven't really...
  5. A

    Why can we balance a bicycle only when it's moving?

    If I'll shove a bicycle down the road, without even being on it, it will go on perfectly without crashing, until it will reach to a minimal speed and then crash. Why is that? why can't we balance an imobile bicycle? A lot say it has to do with the gyroscopic effect but my physics professor said...
  6. MexChemE

    Transient state energy balance -- Variable volume system

    Hello PF! I have some questions regarding the accumulation term for the energy balance on a variable volume system. Suppose we have a tank storing a liquid substance. The tank has a moving boundary at the top, which can expand unlimitedly. The system has a mass input \dot{m}_1 and mass output...
  7. MexChemE

    Energy balance on metallurgical furnace

    Homework Statement Pure iron sulfide (FeS2) is fed into an Herreshoff furnace at 25 °C. An 83% of excess air is also fed into the furnace at 25 °C. The solid product consists only of Fe2O3. The solid product reaches a temperature of 1832 °C, and the exhaust gases (8.7% SO2, 9.8% O2, 81.5% N2)...
  8. R

    Motion, Energy balance, momentum question

    Homework Statement A block of mass m= 10kg rests on a horizontal table. The coefficient of friction between the block and the table is 0.05. When hit by a bullet of mass 50 g moving with speed v, that gets embedded in it, the block moves and comes to stop after moving a distance of 2m on the...
  9. A

    Measuring a Coil of Wire With Ohmmeter and Balance

    Homework Statement A coil of fine copper wire has a resistance of 6.2 -Ω and a total mass is 14.4 g. What is the diameter d of the wire and what is its length L? (The density of copper is 8.96 g/cm3.) Hint Given: •Model the wire as a long cylinder of diameter d and length L. Write one...
  10. MexChemE

    Unsteady state mass balance -- Draining of a tank

    Homework Statement A cylindrical tank, with a diameter Db, open to the atmosphere, is drained through an orifice in the bottom of the tank with a diameter Do. The speed of the fluid flowing through the orifice is given by v = \sqrt{2gh}, where h is the height of the liquid measured from the...
  11. K

    Thermo - Simple Energy balance equation

    The General Energy balance equation is: ∑ENin - ∑ENout + Egen = Est (in rate form - don't know how to put the dot above) I know that Est is 0 when the system operates at Steady State Steady Flow (SSSF). I have 2 formulas for ΔE in "Q-W = ΔE" 1) ΔE = ΔU + ΔKE + ΔPE 2) ΔE = m[h2 - h1...
  12. MexChemE

    Energy balance -- Physical interpretation of Q

    Hello PF! I have a simple question on energy balances. Suppose you have an isothermal reactor where you want to have an exothermic reaction happening at 450 °C. The simplified energy balance for the reactor is Q = ΔH. Supposing ΔH = -150 kcal, then Q = -150 kcal. Does this mean that, a) in order...
  13. S

    Energy Balance of Beta+ Decay of $^{22}_{11}Na$

    Homework Statement If we have a beta + deca: $$^{22}_{11}Na(3^+)\rightarrow ^{22}_{10}Ne(2^+)+ e^+ +\nu $$ with $t_{1/2}=2.6 years$, what is the energy balance at this decay, if you know that $^{22}_{10}Ne(2^+)$ is an excited state of $^{22}_{10}Ne$ with $1.25 MeV$ larger energy. Homework...
  14. Newtonfalls

    How Does the Ruler and Hammer Balance Trick Defy Physics?

    Hi, yesterday i saw this video on discovery channel. <link to video deleted> in the documentation it was said that this trick with the three hammers and three rulers doesn´t match with actual laws of physics! does anyone can give more information about this?
  15. J

    Where can I view the balance on my SS/Medicare contributions

    I'm interested in how much $ I've contributed to my Social Security and Medicare savings account over my lifetime. Where can I go to view the balance? Can someone provide with a URL to the government site that shows how much is in my lock box?
  16. N

    Dry ice sublimation, heat balance

    Homework Statement The problem is this: what is the optimum amount of dry ice inside the Styrofoam pack, if we want to received a frozen dough (temp.-18) after 3 days of transportation in temperature 20 C ? My calculations and data placed in the attached excel file, but I'm not sure if they...
  17. RioAlvarado

    Balancing Normal Forces (Statics).

    Homework Statement A horizontal uniform bar of mass 260 kg and length L = 3.0 m is placed on two supports, labeled A and B, located as shown in the diagram. A block of mass 60 kg is placed on the right end of the bar. Find the normal forces FA and FB exerted on the bar by the supports. Enter...
  18. MexChemE

    Pyrite roasting -- Mass balance with chemical reaction

    Homework Statement A certain pyrite ore contains 85% of FeS2 and 15% of inerts. This ore is introduced into a roasting furnace with 20% excess air, in order to oxidize the FeS2 in the reaction: \textrm{FeS}_2 + \frac{11}{4}\textrm{O}_2 \rightarrow \frac{1}{2}\textrm{Fe}_2 \textrm{O}_3 +...
  19. nahian taskin

    How to Solve a Material Balance Problem for Two Liquids A and B?

    Two liquids, A and B, are mixed together. A is 5.00% solids, the rest water. B is 11.0% solids, the rest water. To the mixture is added 18.5 kg of bone-dry solids resulting in a mixture of 2 150 kg containing 8.25% solids. What were the original amounts of the liquids A and B?
  20. jonny23

    Does internal resistance affect balance point?

    Homework Statement if a potentiometer has driver cell and wire AB ,then an unknown emf (emf<driver cell) is balanced at some length L. does the balance point change if internal resistance of driver cell is changed? Homework Equations V= kl K= potential gradient The Attempt at a...
  21. J

    Finding the center of mass of a system

    Homework Statement [/B] I don't understand what I'm doing wrong with this problem: An old club-ax consists of a symmetrical 8.3 kg stone attached to the end of a uniform 2.9 kg stick. The stick is 98 cm long, and the 18 cm long stone is drilled through its center and mounted on one end of the...
  22. C

    Calculating Reactions in Balance: A Student's Question

    Hi all, I am an architect student in college and I am trying to calculate the reactions in the question in the follwing url ( https://www.flickr.com/photos/123626386@N07/16250310830/ ) I have attempted the question and got two values which can be seen in the following url...
  23. C

    What Is the Correct Equation for Fluids Momentum Balance?

    Homework Statement Attached document Homework Equations m(flow)*(v1-v2)+P1A1-P2A2 The Attempt at a Solution I did a mass balance to plug into the momentum balance, but I am not getting the final equation correct.
  24. D

    How do probabilities balance the odds?

    Let's consider a simple roulette game, where one may either get red or black. Since the probabiblity P of an event A, P(A) is defined as the relative frequency at which the event occurs, if we get red , say 3 times in a row, it is very likely that the next random pick will be black. My question...
  25. K

    Thermodynamics problem - Compressing the air. Energy Balance

    MODERATOR NOTE: THIS THREAD WAS ORIGINALLY POSTED SOMEWHERE ELSE, SO THERE IS NO TEMPLATE. Dear! I have a problem with one, complex exercise. I’ve divided it into three parts just to simplify finding the answer. So let’s start. The air is sucked from the atmosphere by a compressor. Atmospheric...
  26. C

    Engineering Circuit theory -- Conditions to balance a resistive bridge circuit

    1. Homework Statement Establish the condition required to make the current through Ze in Figure 1 zero (i.e. For the voltage Vx to equal Vy). Homework EquationsThe Attempt at a Solution I'm not sure if I'm on the right line here, hopefully someone can point me in the right direction if it's...
  27. S

    Does Copper's Oxidation State Need Specification in Chemical Reactions?

    Homework Statement A student performs a single replacement reaction by dipping a strip of copper metal, Cu(s), into an aqueous solution of silver nitrate, AgN03(aq), to produce silver, Ag(s). Write the balanced equation. Homework Equations The Attempt at a Solution The answer has...
  28. M

    Motor Principle and Magnet on Balance

    Hi everybody. This is my first thread ever on this forum :S I'm in a first year physics class, and the other day we did a lab involving a c.c.c (current carrying conductor) and a magnet on a balance. The c.c.c was a wire which completed a circuit. One had a magnet assembly which was placed on...
  29. TheNerdConstant

    What's the best ways to balance study/social life?

    I have been struggling to balance my study social life for a while now, when i study for instance i often overdo it doing like 5 hours after school this really accelerates my learning but leaves me feeling slightly depressed, stressed and overworked. However the opposite occurs when i try to...
  30. T

    How does a current balance work?

    < Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown > I am looking for a very simplistic and understandable explanation for how it works as I don't seem to find any place that explains it well... I am just doing A Level which is equivalent to high...
  31. gfd43tg

    Overall balance vs. differential balance

    Hello, when doing mass and/or energy balances, how does one know when one should use a differential balance over a total balance? It would help when knowing how to approach a given problem.
  32. S

    How Does Measuring Position Impact Speed Measurement Accuracy in a Pendulum?

    Homework Statement We have a pendulum in thermal balance with the surroundings - no damping. We measure the speed of the pendulum. The accuracy of each speed measurement is known. How does the accuracy of the speed change, if we decide also measure the position of the pendulum with accuracy 10%...
  33. MexChemE

    How Is the Enthalpy Balance Equation Derived for Chemical Reactions?

    Hello PF! I have a very short question. We're currently doing enthalpy balances for chemical reactions in our Thermo class. We are using the simple enthalpy balance equation: \Delta H_{\textrm{Reaction}}^0 = \sum \Delta H_{\textrm{Products}}^0 - \sum \Delta H_{\textrm{Reactants}}^0 My question...
  34. gfd43tg

    Mass balance for diffusion and analogy to heat conduction

    Hello, I just began learning mass transfer, and I am trying to use analogies from heat transfer to help me solve problems. For example, if you have one dimensional heat transfer through a plane wall, I would start with a general energy balance. $$\frac {dE}{dt} = \dot Q_{x} - \dot Q_{x + \Delta...
  35. W

    Achieving the Balance Point: Current Flow & Galvanometer Reading

    Homework Statement when the balance point is achieved , there're no current passing thru , so Galvanometer should show 0 . Am i right... so there's no current passing thru the 20 ohm resistor . so my working is ( 8.1/120 )(40) = 2.7 V ... correct me if I'm wrong...Homework EquationsThe Attempt...
  36. T

    MHB Solving the Spring Balance Problem: Work Done Stretching 5.0-12.2in

    Hi all, I could use some assistance with the following problem. "The spring of a spring balance is 5.0in. long when there is no weight on the balance, and it is 9.6in. long with 8.0 lb hung from the balance. How much work is done stretching it from 5.0in to 12.2in?" So far, I know to take...
  37. 1

    How Do You Balance Complex Chemical Equations in Ionic and Neutral Forms?

    Homework Statement Write the balanced chemical reactions in ionic and neutral forms for: i) Enargite leaching by sodium bisulfide in basic solution to form chalcocite and thioarsenate. ii) Oxygen pressure oxidation of As2S5 in acid solution to form scorodite. Assume all sulfide sulfur forms...
  38. 1

    Converting an Equation to Neutral Form

    Homework Statement Hi. I have convert the following equation (which is in ionic form) into neutral form: 4S2O32-+O2+2H2O=2S4O62-+4OH- The question tells me to use calcium as a counterion for all anions. Homework Equations N/A The Attempt at a Solution I basically just added calcium to the...
  39. S

    Energy Balance Spring Slider system

    I am currently looking facing a problem concerning a spring slider system. The system consists of a electro engine that pulls on a spring with a constant velocity. The spring is attached to a block that sticks to the surface, but after a certain force is applied (by the spring) starts to slip...
  40. B

    Solving Material Balance Problems in Evaporators

    I have an issue with this question: An aqueous solution containing 15% NaOH and 0.5% NaCl is concentrated at a rate of 100 kg/min in an evaporator. The concentrated solution is then mixed with 2000 kg of aqueous NaOH solution in a mixer. At the end of one hour a sample is collected from the...
  41. M

    Balance an unbalanced 3 phase connection of appliances?

    Hi there, I want to know what is the best way to connect these devices to a 3 phase power supply outlet and minimise the unbalanced load as much as possible safely? I am only worried about the single phase appliances. What type of connection would you recommend? 3x Power Supply units Single...
  42. joema

    Polar graph for engine balance on common types?

    In a late 1980s trade journal, I saw a full-page of polar balance diagrams for each major engine type. For each engine type (V6, V8, inline 6, inline 4, V12, etc) a circular polar chart was presented with overlaid color-coded graphs showing 1st, 2nd and 3rd order balance for 360 degrees of...
  43. Telemachus

    Continuum mechanics, physical interpretation of terms in balance eq.

    Hi there. I'm reading Gurtin's 'the mechanics and thermodynamics of continua', and working some exercises of his book. In the section 21: 'The first law: balance of energy', after the derivation of the balance equation, he uses an identity to rewrite the balance of energy. The balance of energy...
  44. D.R.U

    Balance Beam: Why Does It Stay Horizontal?

    I have already balanced beam both side two same mass at same distance and it is pivot on its center of gravity...so torque is zero so no rotation possible by gravity on earth......so why beam always be horizontal to Earth surface...after give inclination to Earth surface.....potential energy not...
  45. F

    What is the balance point between 2 gravitational bodies called?

    Hi there! My physics is not exactly strong (I am a games developer/designer). Basically I have a game idea where the player will jump between the floor and the ceiling. At any point the player will jump and be affected by the gravitational point of the ceiling and the floor at the same...
  46. skulliam4

    Rotations Per Minute Needed to Balance a Top

    I have little to no experience with this area of physics, so don't assume I know certain things. A cone is spun (with the tip down) at a constant, not decreasing, RPM (Rotations per Minute). What is the minimum RPM for it to stay there without falling, and (if possible) the minimum RPM necessary...
  47. R

    FE Review force balance Question

    I am working out of the 2010 lindeburg book which can be found here. The solution is in the book so I am actually looking for an explanation rather than a solutution. http://www.scribd.com/doc/113765067/FE-Review-Manual-Lindeburg-2010 this is chapter 10 pg 8 in the chapter, reviewing the...
  48. R

    Moment Balance - Angled Wine Bottle Holder

    Hey all! I think I have the problem within my grasp, just would like a second opinion to help me cross the finish line... Homework Statement Consider the following diagram of the bottle holder assembly (see attachment). The weight of the bottle is 11N, and the weight of the board is...
  49. A

    Algorithms for atmospheric water balance method

    Hi I want to estimate divergence of water vapor flux in atmosphere with NCEP/NCAR data I have the equations for that and i want the algorithms to implement it for NCEP/NCAR data. I have a paper with algorithms for ECMWF data. Can i take this? or it required new algorithms for my data
  50. C

    Can someone balance these weights?

    Can someone please help balance these weights? I would say the bottom and second to bottom connect as I circled them so they are balanced, but it gets really confusing after this.
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