Calculations Definition and 983 Threads

Say I wanted to do a calculation with numbers that had an error attached...what would the error be on the final answer? For example, say I was trying to work out the distance v in relation to lenses etc. by this formula: \frac{1}{v}=\frac{1}{u}+\frac{1}{f} say u was 50cm plus or...

Hey all, I'm trying to calculate the charge that forms on two adjacent and asymetrical cylinders when a voltage is put between them. The figures I was using was something like 1mm radius for one and 10mm radius for the other, a voltage of about 20kV and a separation of a few cm. I thought...

Hi ... Want to know about " How I can calculating ... Or ... Using Wich Formula " that is making me able to finde the relationship between the Haudraulic Pump Pressure and the Piston Pressure .? on what i should depend when i want a piston and a hydraulic pump For Example : I have a...

Are there any antimatter calculations, that are in any way related to antimatter? (Please post the equation and the use of it :)) Also, I already am aware of the E = mc^2 one ;)

A room has a need for 2000W for an outside temp of -20 C. A radiator with this capacity is installed and receives water at 90 C, which exits at 70 C. But because of some error only 40% of the intended water amount flows through the radiator. The water temp delivered to the radiator is adjustet...

Hey I would really appreciate help on the calculations, because I am just not quiet getting it. I had 3 different reactions I had to do. First, some things to note: Since all the solutions are dilute, then the density of each soltuion can be assumed to be 1.00g/mL. So, 100mL has a...

I tried some formulas on my graph calculator after reading about root mean square calculations of power and physics. Plot these using radians: Y1 = (sin(X)^2)^(1/2) Y2 = (tan(X)^2)^(1/2) Y3 = (tan(X)^3)^(1/3) Axis: 0<x<2(pi) 0<y<2(pi) or zoom to fit! kinda cool huh! Has anyone...

I'm having trouble with the calculation side of Chemistry (ideal gas equation, amount of substance etc). I guess it's mainly the equations I am having trouble remembering.. If anyone knows of any site/place with them all on i'd _REALLY_ appreciate it, thanks.

It's all still so confusing! Setting up the equation isn't the problem.. plugging in the numbers. I'm missing varibables and I don't know where to go to find themm i. if the spring constant is 2000 N/m how far will the spring have to compress to bring the coaster to a stop? (Asume the weight...

I am building a tennis ball launcher for my physics class, and it needs to be no bigger than 1m X 1m, it must reach to a target that is 2 - 7m away from the launch site, and the target may or may not be at a certain height. No fire, explosives, gasses may be used. It must run on pure mechanical...

Hi, I having troubles with the following problems. 1) Calculate the energy change which will occur when 30g of nitrogen(II) oxide is converted to nitrogen(IV) oxide by reacting with oxygen in the air. 2)Copper(II) oxide can be reduced to copper metal and water by using hot hydrogen gas...

Hi, Am wondering how to calculate the thrust and impulse thrust for gas escaping a pressure bottle - ie a scuba tank or the like. My maths is a lil shady so go easy on integration and such. Like say if I wanted 1MJ of energy output - what size bottle at what pressure with what nozzle...

HI, When doing some calculations for a JFET (n-channel), I guess u all know this equation: Id = Idss( 1 - (Ugs/Up))^2 my question is, am i supposed to take the absolute values (modulus) of Ugs and Up? Id = drain current Idss = saturated drain-source current Ugs = gate-source voltage...

Hi again, I was able to solve the previous problems I had, with some study over the net and some books. Now I have a different problem: I have a routine that uses Mu (GM) for calculations; for the planets, Mu = GaussK * GaussK * ( 1 + mass ), where GaussK is the Gaussian constant...

Hi I got a couple of questions regarding the following chemical reaction. First some calculations: 90,0 \textrm{mL of} \ 0,250 \ \textrm{M} \ BaCl_{2} is mixed with 0,500 \textrm{M} of Na_{2} CO_{3} which generats residuum. a) BaCl_{2} \rightarrow Ba^{2+} + 2Cl_{2}^{-} \ (i)...

Hello Everyone, I am a programmer and I am working on an application that can do torque calculations for some motor simulation models that I am working on. What I have is a torque data file wilh data representing the amount of torque on a wheel at a given degree of it's rotation (so if I had...

Please help me wif these problems! I have no idea. A person with a body resistance between his hands of 10 kohms accidently grasps the terminals of a 20 kV power supply. (a) Draw a circuit diagram including all the data. (b) If the internal resistance of the power supply is 2000 ohmns, what...

The most popular equation is E=mc2. I remember growing up the hype was only like 2 people in the world could understand the Theory of Relativity. I have never looked at the actual calculations behind that simple equation. How it was derived. I'm just curious if anyone here has looked...

Hi I'm designing a torque wrench. But i need some help. I have a drawing torque3.jpg the gear connects to the socket. If I'm putting 300ft/lb torque on a nut using the socket connected to the gear. and the gear connection to the handl thru the gear locker, and the gear locker can push...

Hi I'm designing a torque wrench. But i need some help. I have a drawing torque3.jpg the gear connects to the socket. If I'm putting 300ft/lb torque on a nut using the socket connected to the gear. and the gear connection to the handl thru the gear locker, and the gear locker can push...

k few questions I am stuck on... 1) A student with a mass of 80.0 kg runs up three flights of stairs in 12.0 sec. The student has gone a vertical distance of 8.0 m. Determind the amount of work done by the student to elevate his body to this height. (constant speed) and.. 2) Bob is...

Problem 2. Liquid nitrogen, which has a boiling point of 77 K, is commonly used to cool substances to low temperatures. How much energy must be removed from 1.4 kg of gaseous nitrogen at 77 K for it to completely liquefy? Assume the latent heat of liquid nitrogen is 2.01 *10^5 J/kg Answer...

can you help? I have a restaurant exhaust fan with a drive pulley of 2" and a shaft pulley on the fan of 7 and 3/4 inches. The belt that fits this is 21/32" width. The belts keep wearing out very quickly. I think that larger pulleys would solve the problem. If I doubled the size of the...

Hi All, Does Anyone know of any Math programs that are easy to use that I can download from the net. What I am trying to do is organize a long string of digits in groups of three, add the groups, and subtract from each running total certain incremental values. Thanks in Advance. Dan

Are percentage apparatus errors also systematic errors?

Hi, any advice out there on an interesting challenge (at least a challenge for me :-)? I am trying to come up with the easiest way to calculate the shortest distance between a single point and an arbitrary line. I want to start with lattitude and longitude coordinates for single point and...

Hey guys, gals (Monique :wink: ) Quick question. I recently completed a labortatory session in my Genetics class regarding the isolation and analysis of plasmid DNA, and a section of the report has me stumped. Before the plasmid DNA was put under the spectrophotometer, it was diluted in...

Maybe I am doing something horribly wrong here, but these numbers just make absolutely no sense to me. We are given solubility values which will subsequently be used for Ksp calculations. I was given hydrogen bromide and 5 solubility values (given in g/100g H2O) Since 1g = 1mL basically...

Let me start by saying I most likly have no idea what I am doing. Also, that I realize the factor by which the moveing clock differs from the stationary one will be very very small. Sorry if this belongs in the math fourm, i thought it might require physics knowledge. What I'm having problems...

My intent is to create a thread for people interested in Linear Algebra using Matrices. However, I will explicitly state that I am only a student of this class myself and that many things could end up being wrong or an improper way to teach. I will merely be going along with the class, mostly...

rat10mm asked me to help her with the following dynamics problem: Since this is actually a somewhat sophisticated problem, I decided to post the methodology here, in case someone else could use it. The first part: solving the angle of release. This is just an exercise in energy...

Since I really displayed my ignorance of astrophysics and Newton in my first post “Gravity of the Sun?”, some of you may decide not to consider this one. I really was lost for a while and didn’t keep my argument on target. I am not a physicist by trade. The study of Physics is a hobby and the...

Just two general theory types of questions: 1. Is an object that undergoes circular motion accelerating? Is a force needed for this? Where does the force come from when something is moving in a circular motion? What is the name of this force? 2. For a car going around a flat curve, what...