Balance Definition and 461 Threads

Can somebody explain how do you write a Mass Balance or Charge balance for a acid-base equilibrium? Let say, if you are given 0.01M Zn(OH)2 in a saturated NaOH solution and also given that Zn(OH)2 + 2OH- -> Zn(OH)4(2-) how would you solve the mass balance/charge balance? I really have no idea...

Fluid Mechanics: Flow Between Parallel Plates--Force Balance Equation Homework Statement http://antishift.org/image.php?id=16807&size=full Homework Equations I know the equation for shear, tau=viscosity*velocity gradient. and pressure is obviously force/area. The Attempt at a Solution I...

Hi. I saw this video on google: http://video.google.com/videoplay?docid=6377655322209610872 It's mainly a pendulum attached to a balance arm. It's stated that the energy needed to keep the pendulum going is far less than the energy we can extract from the balance movement. I also...

I have this problem as a homework question for my MEB/Thermodynamics class and have been having some trouble with it. A 10.0 m^3 tank contains steam at 275°C and 15.0 bar. The tank and its contents are cooled until the pressure drops to 1.2 bar. Some of the steam condenses in the process...

Homework Statement a uniform 12.0m long board has mass 500kg. it rest 5.5m over a cliff. How far can a 80kg man walk on the board before it tips? Homework Equations equilibrium and torque The Attempt at a Solution im not quite sure about any portion of my work, because i resorted to...

Fairly simple question, I just couldn't think of a suitable explanation for it. In white dwarfs, neutron stars etc gravity is balanced by high outward pressure of fermions, which are in a confined space, so have v. high velocities. My question is, if you placed a heavy weight on an ordinary...

so... I'm a woman, I study physics, I love science and I get freakishly excited at the prospect of doing research. I am seriously considering it as a career. But then, I look around and damn, the vast majority of my professors are male. They work a lot, do exciting research, and most manage to...

Homework Statement Aqueous solutions of barium chloride and sodium fluoride are mixed to form a precipitate of barium fluoride. Homework Equations i'm not sure but i put. BaCl + NaF = BaF2 + NaCl2 The Attempt at a Solution I'm pretty much confused whether you balance the...

Hello, I need help for the following question: Peter borrowed $100,000 from bank and he pays back at a rate of $12,000 per year. The bank charges him interest at a rate of 7.25% per year compounded continuously. Make a continuous model of his situation using differential equation involving...

Spring Balance in Space(no calculations) Using a spring balance in space to measure the weight of anything is useless. Is there any way to use a spring balance to compare the weight of two people in space?

Hi, A body weighs 8gm when placed in one pan and 18gm when placed on the other pan of a false balkance. If the beam is horizontal when both the pans are empty, then what is the true weight of the body? How do I do this? Please help.

Given the equation Q* = QH + QE + QG and the corresponding data (all fluxes in [W/m²]). How can I find the equivalent loss of stored soil liquid water expressed in [mm] (Note: the conversion factor is the density of liquid water, i.e. 1000 kg/m^3) Thanks very much for your help!:confused:

If I'm finding the slope of the line of average balance mass(g) vs. total mass (g), should the units for slope be grams? or does it not have units? I know it should be g/g but would that cancel out or stay grams? Sorry if that's confusing. Thanks.

perceptual balance and "sea legs" I'm sure everyone has experienced this. After coming off a boat trip of several days, I feel like the soild ground under me is swaying as if I'm still on waves. This can last for days. What I wish to understand is what in the brain is causing this perception...

Ok, here is another one I have, this is one of a series of half-cell questions... this one is confusing. 79. Balance the following equations by the half-cell method. Show both half-cell reactions and identify them as oxidation or reduction. b) Cl2(g) + OH- <=> Cl- + ClO3^- + H2O(l)...

Hello to all, I have one question and hope you'll help me to answer it. Recently I have visited one power plant. There I learned basics of el. energy production and also fact that in every moment production = consumption because el. energy cannot be conserved. I also learn that by allowing...

I read in “N. David Mermin, It’s about time, (Princeton University Press, 2005) p.144: ”Furthermore, even when you put together identical bricks, it turns out (in the relativistic case) that the mass of the object you construct depends on how you put the bricks together.” In order to test the...

Hi ppl. Why is it, the "centre of mass" determines how good the balance of an object is ? I’ve tried this experimentally, on when I place the centre of mass below the object, its nearly impossible to push over, Or well... It IS IMPOSSIBLE! Could someone please tell me which equations tells...

I think it is true to say that every thing in the universe must ballance in some way, apart from matter over comming anti matter, by some un explained process, so if the universe can be explained by some metric, is there an anti metric ?

When can I say that the system is in equilibrium? How can I estimate how quickly it takes to the system to reach equilibrium? Thanks.

I've been trying to wrap my mind around how a balance works, and I come up with a question I need help with... If you have a traditional balance scale, and you put perfectly equal weights on both sides, of course the scale balances the two out, and the two objects being weighed end-up at equal...

Here is the problem. 50g of liquid is heated by 30 degrees in a calorimeter in 530 seconds. The power is 10W. 100g is heated by the same amount in the same time with a power input of 16.1W. What is the s.h.c (Cs)of the liquid. I know that: Cs = (1/mass) x (dH/dt for liquid) + (dH/dt for...

A 70kg adult sits at one end of a 10m board, on other end sits a 30kg child. where should pivot point be placed so board is balanced? board's mass is 15kg. so far, i have pivot point is 15kg(9.8)=147N (5) <-- half the board length.. for adult i have 686N and kid is 294N. i know that...

ive asked this before but i was answered that what made me think a vertical balance should level to horizontal. well here is a reason: http://www.pbs.org/weta/roughscience/series3/gold_rush/balance.html if the weights are the same in both arms and you lean the balance 45º it will go to...

What are the forces acting on an air parcel in the vertical direction? What about geostophically in the horizontal direction? How can I sketch these forces? thanks

Hi all. First post on a Physics Forum for me. o:) As a ski instructor I generally hang out on the EpicSki Teaching & Technical Forum but the jocks over there try and beat me up whenever I delve into a mathematical exploration of our sport. A recent question (though likely asked solely in...

Hi all, Im doing a question in the homework, its #13 and I am struggling on how to get started. The question is: what are the magnitude and direction of the electric field that will balance the weight of (a) an electron and (b) a proton? There is an answer in the book, for the electron...

This question has been bothering me for time. How does a moving bicycle manage to stay upright? but when it slows down it tends to fall to a side. Can someone please explain?

i rise 10 tons 10 m up by lowering ten tons 10 m down with a pulley i connect the weights with a weightless balance i use the oscillation of the balance to produce electricity with an electric motor, when the weights reach the initial altitude the process is repeated can anyone explain...

why is C02 an incresingly abundant greenhouse gas?? ANd if there's a hold in the ozones how exactly will it affecet aggriculture and the population? will things slowly die off or ?

i want to build a pendulum in resonace with a balance to see what happens so anybody knows what's the swinging prequency of a balance depending on his arm and that of a pendulum that i don't remember know

I'm trying to use online lab software to do my assignment but I'm not sure if I'm doing this right... I'm to measure a copper slug (I think that's what it is) using a Centigram Balance. There are three rulers or whatever they are on this thing...the one in the very back is at 0, the one in...

"A meter stick is found to balance at the 49.7cm mark when placed on a fulcrum. When a 50 gram mass is attached at the 10cm mark, the fulcrum must be moved to the 39.2 cm mark for balance. What is the mass of the meter stick?" thats the question and the last one on my homework and its given...

Why won't this work? :frown: ---------------------------------------- import javax.swing.JOptionPane ; public class FinalBalanceCalculator { public static void main(String args[]) { String input; String name; double b0; double rc; double ty; double ans; input...

lm doing an assignment regarding resistance may caused an error in the magnitude of the output voltage.

you have a balance with 1kg weight in each 1 meter long arm when its horizontal each 10 N force * 1 m long will balance so the balance won't move but when you lean the balance 45º the vertical force will be cos 45 * 10 N in each arm so the balance should stay in that position since the...

you have 9 coins. one of these coins is faulty, that is it is either heavier or lighter than the rest. you have a weighing balance. in thre weighings you have to find 1. which is the faulty coin and 2. is it heavier or lighter.

What is the procedure of static Mass Balancing of any assembly which has a total mass of 100 kg with subsystems which would assemble in it is ranging from 2.5 to 10 kg ... i think to hang the complete system freely in air and then checking the placement of exact cenetr is an appropriate method...

SO32- +MnO4-1+H+1 <-> Mn2+ +SO42- +H20(l)

Sure enough this came up somewhere: However: http://motls.blogspot.com/2005/04/Earth's-energy-balance.html

I was just walking home from class and was thinking about the imbalance of what is taught in schools and colleges. I'll be graduating in May and I realized how focused the United States and other countries (I think) are towards math and science. However, when I look back at my college and high...

what is the reason why the number of H- ions in a gas must always be less than the number of HII ions?

does anyone know what the current balance can be used for..ie. a practical application of the current balance?

Check this Balance in an acidic solution Fe2+ + MnO4- ----- Fe3+ + Mn2+ (Fe2+ ---- Fe3+ + 1e-) x 7 7e- + 8H+ + MnO4- ----- Mn + 4H2O 8H+ + 7Fe2+ + MnO4- ----- 7Fe3+ + Mn + 4H2O Thanks Nautica

A beaker filled with water is balanced on the left pan of a balance. A cube of 4 cm on an edge is attached to a string and lowered into the water so that it is completely submerged. The cube is not touching the bottom of the beaker. A weight of mass m is added to the right pan to restore...

How do u balance Mg + HCl? is it MgCl + H?

Please see the attached image to see what I'm talking about. I understand how the forces (in terms of the pressures and areas) are equated, but then it says 'for small delta x' and from there on I'm confused. It's something to do with differentiation, but I don't get it. Can someone...

When we are playing bungy jump, we are instantaneous at rest at the bottom(K.E=0). At that time, is elastic P.E. greater than gravitational P.E? :confused:

A paint mixture containing 25.0% pigment and the balance water sells for $18.00/kg, and a mixture containing 12.0% pigment sells for $10.00/kg. If a paint retailer produces a blend containing 17.0% pigment, for how much ($/kg) should it be sold to yield a 10% profit? Am I wrong, or are they...

Hi Can anybody help me in getting technical information about core balance current transformers. Thanks Mahadev