Balance Definition and 461 Threads

I was just about to apply for my pell grant and it wanted me to tell them how much I have in my bank account. How much will that affect how much money I get from the grant? Does anyone know? If I have a lot, like 10 thousand, will that make me get a lot less, or none? Or if I have under 2...

Haven't taken a course in distillation in a long time and now myself and some others are working on getting a fuel ethanol still going and wanted to do the calculations before we moved forward. We have a beer that is 12% alcohol and reaching a purity of 90% EtOH in the distillate. The mass...

like this: 1)H2SO4 + Al(OH)3 --> Al2(SO4)3 + H2O 2)Pb2+ + Cl- --> PbCl2 and word equation like this ethane(C2H6) + Oxygen --> Carbon dioxide + Water vapour Thq.

There are two main issues I'm interested in for this thread, and how far should regulations have to go to control these issues? 1. The conflict where an individual is in a position to make decisions that benefit the individual at the risk or detriment of the company or other employees...

Homework Statement Two pans of a balance are 50cm apart. If the fulcrum is displaced by 1cm what percentage is the true weight marked up? Homework Equations T=rFsinθ F=mg The Attempt at a Solution I solved for torque of the fulcrum in a hypothetical situation where a mass of 1g is...

Homework Statement Background: This is a problem I made up as part of an extra credit assignment for my first dynamics (engineering) class. I know the system will of course roll over, and he will end up looking like a fool, but that is besides the point. Keep in mind also that I can modify...

I am really struggling to get to grips with this question, ( struggling with material balance overall!) I can do dimple material balance however for things with a recycle stream or purge stream, really confuses me. I have the solution which I will post up, but I still don't get 'why' it...

By definition, the difference between Mass and Weight is easy to comprehend. However, I am really confused, confused to the level I feel like ripping all the hair out of my head, with spring balances: After researching a lot, I think that as I step on a spring balance the spring will extend...

Homework Statement Hi, I need your help in my homework. My Instructor asked that question? Why there is not a work term in entropy balance equation? Homework Equations The Attempt at a Solution I have researched about it and I found that, entropy has not an exact physical...

Hello I am trying to design a force balance lever system. Basically the initial state will in a force balance equilibrium. That is, there will be a mass m placed onto of the capacitor plate to keep the lever balanced. I will then ramp the voltage of the capacitor up, causing a force of...

Hi guys, I wanted to know these things with their respective examples : 1. What is an atom ? 2. What is a particle ? 3. Why do we use/calculate the atoms of an element to balance an equation ? Please answer to these questions guys, because I only have 2 days for my exams and to know them.

It it normal to like physics research better than solving problems for coursework? Is physics coursework in the U.S. is too problem-solving oriented? Thanks

Assume that you have two protons accelerated in opposite directions within a cyclotron. As they approach the speed of light their masses increase. At what proportion of the speed of light will their gravitational attraction (due to their increased mass) equal their electrostatic repulsion ?

Homework Statement A body weighs 6 gms when placed in one pan and 24 gms when placed on the other pan of a false balance. If the beam is horizontal when both the pans are empty, the true weight of the body is : Homework Equations The Attempt at a Solution I don't know which...

Homework Statement A mass, m = 175 gram is placed on a hanger which has a mass of 50 g, giving a total mass of 225 g. The hanger is then hung at an angle of 120° over a pulley attached to the force table by using a string of negligible mass. The pulley over which the string rests has very low...

Ag(subscript of 2)S + HNO(subscript of 2) -> Ag(subs.2)SO(subs.4) + NO(subs.2) +H(subs2)O TNX! PO!

Homework Statement This was a concept question my lecturer gave us, and although he tried to explain it thoroughly, I still didn't get it. So I was hoping someone could help me out. There are 2 parts to this question Firstly a spring balance is attached hanging from a celling using a...

Homework Statement Homework Equations ordinary mass balance The Attempt at a Solution So far I have gotten: d[rhob*V]/dt = Min - ?

Homework Statement what is the measurement Homework Equations The Attempt at a Solution Is there something wrong with the picture or is it possible to have beam balance with two same scales (the upper and middle ones). If possible then the reading = 90 + 30 + 8 = 128 g ...

consider a weight balance with two unequal masses on the two arms.It comes to rest after tilting a few degrees. If one of the masses really experienced a greater force, then there is no reason why the balance shouldn't tilt 90 degrees

If a organism has a dna mutation, would this not imply that some trait is lost. If there is a mutation then somewhere in the dna there is a difference which would cause something to be missing. Is this right? If this is the case then how come complicated speices still have all there original...

Wondering if you have time for a (hopefully) quick math question: To put it simply, the equation is as follows: (xA + zB) / (x + z) = y Where all values except x are pre-determined, and x needs to be changed so the left equation equals y. y represents the center of gravity for a...

Im having difficulty with question b in this problem: [PLAIN]http://img705.imageshack.us/img705/9484/therm.jpg Heres my attempt: m(v1^2)*1/2)+h1)=m(v2^2)*1/2)+h2) + Qout (v1^2)*1/2)+h1)=(v2^2)*1/2)+h2) + Qout where v1 = 200ms^1 and v2 = 40ms^-1 and h1 = 3104.9kj/kg And my answer is 22,000kj/kg...

Homework Statement A rock is attached to the left end of a uniform meter stick that has the same mass as the rock. How far from the left end of the stick should the triangular object be placed so that the combination of meter stick and rock is in balance? a. 0.25 m. b. between 0.25 m...

1. If you walk along the top of a fence, why does holding your arms out help you to keep your balance? 2. Charge is also said to be conserved. What does it mean? Explain. 3. When a car drives off a cliff, why does it rotate forward as it falls? 4. Why does a book sitting on...

Hey, I was wondering in what way the detailed balance condition (DBC) has to do with thermodynamic equilibrium. The DBC is defined as W(i\to j)P(i) = W(j\to i)P(j) with W the rates (probabilities per unit time) to jump from state i to j. P(i) is the equilibrium prob. density to have...

I find it tough to balance my research and my family and wonder how others succeed in this regard. Every serious researcher will agree, I hope, that research demands undivided attention for high quality work. How can then a researcher take care of her/his family adequately? Should she/he...

http://www.powerbalance.com/ Has anyone researched the power balance bracelet? I bought one for $30 and I'm going to test it on some high schoolers. I think everyone here would be convinced that this is complete quackery, however, I think there is still a valuable lesson about peer review...

moved

The scale of a spring balance reading from zero to 180 N is 7.00 cm long. A fish suspended from the balance is observed to oscillate vertically at 2.50 Hz. What is the mass of the fish? Neglect the mass of the spring. ________ kg Attempt k =(180-0)/(7-0) = 25.714 N/m frequency =...

Homework Statement Ok, please use my example of giving me a step by step guide on how to balance an equation: Homework Equations K + Br2 --> KBr The Attempt at a Solution I know that I should write down the equation, draw a line underneath the arrow to separate the balancing...

Hey guys i was hoping for some help with the mass balance of the equations for the production of styrene from ethylbenzene. I have attached my problem sheet and my answer sheet, q 7 is what i am stuck on please help me i am confused

Homework Statement A steel girder with a mass of 1000kg and a length of 10m rests on a concrete slab, with 4m overhanging the edge. How far can a 100kg man walk on the girder? The Attempt at a Solution I supposed that the right end of the slab is the fulcrum (rotating point), and...

I would appretiate help with the following 2 questions, I think I've got must of the first one right (Or went off t a tangent) but I don't now where to start on the second question 1a) Calculate the flue gas composition if 100 kmol h-1 of a gas whose composition is given below are burnt with...

For example, if we have 2-butanol, a compound with a secondary \alpha carbon and I reacted this with HCl and NH4Br I would get 2-bromobutane (via nucleophillic substitution), but how would I determine whether this goes via SN1 or SN2 to achieve this? Now, if this was 1-bromobutane, I know...

Homework Statement Hi all. I've got a vertical rod on a surface with a fixed and frictionless pivot at bottom end. The rod of length L is released and begins to fall. The forces acting on the CM of the rod should be: - weight force: mg - centripetal (radial) force...

Hello, I am just thinking: why it is hard to balanca a (2-wheel) bicycle when it is not moving, while it is easy balanced when it is moving? I hope that I am asking in the right forum. Thanks in advance

Homework Statement A man of mass mm = 90 kg decides to paint his house. To do this, he builds a platform using a uniform beam with a mass of mb = 91 kg and a length of L = 7 meters. The beam is supported by two sawhorses, ---------------------- A B (distance from A to left...

Hi I'm doing a practice paper for a past mathematical modelling exam. I've attached the problem What I'm having trouble with is simplifying the equations and variables into a differential equation that is solvable with Euler's Method. What I have currently is the sqrt(h1-h2) in the...

I messed up on the title of the thread.. I had a few questions but ended up solving them on my own. The only question I have is how to solve this ODE. Thanks. Homework Statement Solve the ODE (dx/dt)= f(t) - .1x Where f(t) = 2+sin(t)2. The attempt at a solution I faintly remember doing...

Homework Statement BCl3+H2O2>>H3 BO3+HCl Homework Equations need to balanc it The Attempt at a Solution

Homework Statement A point charge q = -0.5nC is fixed at the origin. Where must a proton be placed in order for the electrical force acting on it to be exactly opposite its weight? Homework Equations F= k(q1)(q2) ------------ r^2 The Attempt at a Solution Trying to...

Hello, I am trying to make something that spins out of balance. currently my current weighs are half circle in shape. I know that if I change the profile of the weights to a pie shape (less than 180deg semi circle) the center of mass moves away from the axis of rotation, but at the same time...

Homework Statement In this era of high energy prices, there is a focus on renewable sources of energy such as wind energy. Consider a large windmill 30m in diameter. On a windy day, suppose that the windmill entrains a stream of air 25 m in diameter at a speed of 14 m/s. Downstream of the...

Fox News clearly picks a side when it comes to debates. How do you consider this fair and balance?How can they claim they are they only non-corrupt network? What did Obama gave CNN? What sides of any issue has a CNN news caster picked?

Q-1 : A bodu weighs 8 gm when placed in one pan and 18 when placed on a other pan of a false balance . If the beam is horizontal when both the pans are empty , the true weight of the body is Q-2 : when one swims across a river max. energy is spent in second 1/3 of the distance why ?

1. A Wheat stone bridge resembling setup is given with two parallel branches , the 1st containing an Inductor of Inductance L1 and resistance R1 in series with a resistor R2. The second branch consists of inductor with inductance L2 and resistance R3 in series with a resistor R4. The branches...

I am curious. Maybe I don't understand something, but many articles I come across perform an energy balance on a solid and on a liquid. **I assume evaporation acts on the remaining liquid and not directly on the substrate. Correct?** They always include heat loss due to evaporation as...

A uniform plank us supported by a hinge at one end. What is the magnitude (expressed as a multiple of the plank's weight Fg) of the upward force you have to exert on the other end to keep the plank at rest and level?

Homework Statement A beaker with water is in equilibrium with a certain weight in a balance. Then we tie a cord to a stone, and soak the stone in water, without touching the bottom. What will the balance read and why? http://dl.getdropbox.com/u/698994/ilustra%20forums/experiencia%20empuxo.png...