Calculations Definition and 983 Threads

Please someone check to see if on the right track: A woman lifts a barbell 2.0m in 5.0s, beginning and ending at rest. If she lifts the same distance in 10s, the work done by her is: I said it would be four times as much because I used 1/2mv^2. I placed the v I calculated from v=d/t into...

A 2-kg block is attached to a horizontal ideal spring with a spring constant of 200N/m. When the spring has its equilibrium length the block is given a speed of 5 m/s. What is the maximum elongation of the spring? 1/2mv= 1/2KX^2 max PE equals starting KE. then follows x= v/sqrt k x=.25...

Sorry bout putting the question in the form of like a homework problem, just didnt know how to go bout asking what i wanted. Basically can anyone explain how to do VLE calculations.. So confused with the topic. Whats bubblepoint and dew mean.. Cheers. Hopefully this post is ok for...

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?

I hope this is the right place for this... Well, I have a lab where we measured the charge/mass ratio of an electron using a helmholtz coil and vacuum tube. I need to calculate the propagation of uncertainty in my final value. The formula for calculating the e/m ratio is the following...

Nevermind, but thanks Chi Meson. I was not calculating correctly... Sorry :)

Please check to see if my calculations are correct. I am unsure if I used the right values and setup. You throw a rock of weight 21.0 N vertically into the air from ground level. You observe that when it is a height 14.8 m above the ground, it is traveling at a speed of 25.7 m/s upward...

I have this salt AgBrO_{3} which has got the solubility of \frac{0,196g}{100mL}. From the following information I should be able to calculate Solubility for AgBrO_{3}. I really cannot see how? So please help me. It is really an Urgent matter so a quick replay would be most appreciated!

What is the resulting stress at the upper and lower edge of a section profile with W(b) = 144 cm3 and A = 34 cm² at the fixed end of the girder. I'm not sure about how it looks like.Can smby pls explain to me (if possible,togther with a picture) thanx

i don't know where to post this, but we did a little experiment on pennies, and I'm having trouble with analyzing the calculations... basically the pennies turned into silver, the other gold.. after we heat it, etc inc. in mass of the pennies .0006 g density of the solid added to the...

let be the series... 93712402... Does anyone know what the general term is or how could it be calculated?..thanks. -In fact if you are "Family's matter" fan you will know that this series appears in a chapter when Urkel is "jailed"... the picture...

Hello, everyone. I have a problem that I solved using Gauss's Law. However, I am unconfident in my answers, as I have very little experience with Gauss's Law. The surfaces of two large (i.e. infinite) parallel conducting plates have charge densities as follows: \sigma_1 on the top of the top...

Hey I’ve now come across integration in my maths course for my first time. I was wondering if somebody out there might be able to help me with a couple issues regrading this topic. Firstly I would appreciate if I could be told all the necessary rules for all calculations regarding integration...

An Introduction to pH and Buffer Solutions Calculations [work in progress] This is a work in progress 1. pH and Strong Acids pH is defined as the negative logarithm of the hydrogen ion concentration in a solution; pH = - log10[H+(aq)]. (From this point forward 'log' will represent log to the...

Hi, usually don't ask for help but this is bugging me now! I am working on a r/c model hovercraft, i have been trying to work out the upthrust but can not get a formula to do so. I know the air cushion pressure is a factor, i am using a ducted fan for upthrust with attatched 9 v motor. Any...

A student obtains 25.00 mL of an HCl solution of unknown concentration. Upon titration, 21.35 mL of 0.1200 M NaOH are required for neutralization. Determine the concentration of the HCl solution. the capital M is molar mass right? but i thught that was constant so how can it be 0.1200 M NaOH...

I'm doing some calculations on a set of drumbrakes. In a book I have from my school days it says that the normal force on each shoe are not equal (this is the force appearing on the outer left and right sides of the drum when viewing the drum from the side). This apparently leads to different...

the folowing reaction proceeds with a 70% yeild C6H6 + HNO3 = C6H5NO2 + H2O calculate the mass of C6H5NO2 expected if 12.8g of C6H5 reacts with excess HNO3 How do you do this problem?

Hello, I was wondering if anybody has any experience doing these calculations? I understand the basic concepts ( eg. k is considered far away from the BZ edge and thus is small and that the Bloch function is the linear combination of the individual Bloch functions at k=0 ). Also, the inner...

Hi, I need help with this question what is the molar concentration of 0.50 mol of NaCl dissolved in 0.30L of solution? =moles of solute/leters of solution =0.50mol/0.30L =1.7 mol/L Is this correct? and what mass of solute is present in 1.00L of 0.045 mol/L of Ca(oH)2, solution...

Today many scientists' or physicists' research is mainly based upon mathematical calculations, and not on the real experiments. Mathematics partially reffer to reality but the other half is far from the reality of our world. Hence many theories and studies in science today are away from trivial...

Calculate the ion product to determine if a precipitate will form when 125 mL .00500 M sodium chloride is mixed with 125 mL .00100 M silver nitrate solution. NaCl + AgNO3 -> NaNO3 + AgCl Net ionic equation = 2AgCl -> 2Ag + Cl2 [Ag+] before = .00100 after = .00050 [Cl-] before =...

Hi, I need to calculate and visualize molecular orbitals (HOMOs) of few simple organic molecules (may be using DFT method). The molecules are positivly charged. Can anybody please help me with this calculations?

Imagine that I have a pipe that is on a constant slope at any percent. On the low end of the pipe, there is a container filled with water. The water has naturally found a leveling point up into the pipe. Provided the level of water in the container is above the top of the pipe, a portion of...

HELP! In this experiment I measured the initial mass of a piece of Al and then i put it into a beaker containing 100.0 mL of saturated PbCl2 The concentration I calculated for Pb is 6.12 *10^-^5 mol/L The concentration I calculated for Cl is 1.224* 10^-^4 mol/L Therefore my Ksp= [Pb]...

Hi I am trying to calculate a particular problem from a given bayesian network. The network consists of nodes G1,G2,G3,G4,Pr1 G1 leads to G2, G2 leads to G4 and G3 also leads to G4 but it has no parents, and G4 leads to Pr1. The probability tables for the nodes are: P(G1) = 0.02...

When figuring the force between 2 points, no angle the result is calculated just by distance (and charge). But when there are 3 points, either 2 charges or more and a point or 3 charges, why is there an angle calculation?

solve for dS(distance for Seth) dS(27.0m/s) = (dS + 30.0m)(9.0m/s) dS = 15m how do you get dS on 1 side?

Inlet plenum and gas law calculations? Not sure if this is the best pace to post this question but here goes... I want to get a custom inlet plenum made for my car, there are many already out there but they cost a fortune, but several people have made there own and the construction is fairly...

Hello, This is not homework etc. I am in the work place (automotive industry) and have a question. It has been some time since I have taken any math courses. I am trying to calculate the theoretical weight of a known coating on the surface of a hollow cylinder and set this up in an excell...

A hiker, who weighs 696 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 4440 N, and rests on two concrete supports, one on each end. He stops 1/4 of the way along the bridge. What is the magnitude of the force that a concrete support exerts...

I need help, please!:eek: :bugeye: I am totally and completely lost with this problem. Unfortunately, my book does not give any examples for me to go by. Here is the problem... In the following reaction, 24 g of CH4 (methane) react completely with 96 g of O2 to form 66 g of CO2. How many...

My question seems to be so idiotic.please forgive me for that.On what basis we perform mathematical calculations like addition and subtraction?As for as decimal system is concerned we have only 10 uncontinuos digits.but we are doing so much magic(I don't know whether I am using the correct...

From where I can get the details of lograthmic calculations?How the values are found?and on what basis?

I am looking for a calculation to work out the amount of floatation that would be required to hold up a pontoon weighing apptox 2 tonne?

Hello I am interested in calculating the sound waves created by objects in air. What is the resolution of details that needs to be dealt with in orer to calculate this? Can it be calculated by using traits of the object such as mass density, geometry and other related attributes? Or do you...

First let me say, I have absolutely no idea how to do these. If anyone could show me how I would greatly appreciate it. (Thursday 8/25/05 was my first day in this class) Q1) A crane must lift a crate with the mass of 3.5x10^3kg a. How much force would be required? b. On the...

i'm having trouble with titration calculations. How would you attempt this problem? 50mL of a 0.50M H2SO4 is added to 100mL of 0.25M H2SO4. Calculate the final concentration of the acid. Also: how would you show that aluminum sulphate would show acidic properties using balanced...

Guys, I'm starting to learn c++ and wanted to know hot to implement various operations using only + and -. I'm trying to implement *, /, %, powers, and square root. I've been experimenting with the for loop but can't seem to make it work. Any tips on how to do these? Thanks :D

I need HELP (new) a) yearl income CPI Real Salary (my answer) 1999 20,500 98.5 20,812.18 2000 21,100 100.0 21,100.00 2001 21,400 102.8 20,817.12 2002...

Could someone please help with this rudimentry calculation. I need to know the difference in the energy at impact between the following two scenarios. 1) 2 lbs falling under gravity from 8 feet with an impact area of 12 mm. 2) 4 lbs falling under gravity from 4 feet with an impact area of...

A uniform ladder 5.0 m long rests against a frictionless, vertical wall with its lower end 3.0 m from the wall. The ladder weighs 160 N. The coefficient of static friction between the foot of the ladder and the ground is 0.40. A man weighing 740 N climbs slowly up the ladder. a) What is the...

I need to do some fluid flow calculations at low Reynold numbers. My current PIII won't suffice. Which processor should I go in for? I was looking towards the likes for P4 3GHz with HT. I know with this speed, the calculations will take hours but I am willing to tolerate that. Will a 3.2 GHz...

I was doing the Inverse Square Law, trying to find out g at the surface of the Earth. \frac{4\pi(G)(M)}{4\pi(r)^2}=g G = Gravitational Constant M = Mass of Earth \frac{4\pi(6.67x10^-11)(6.0x10^24)}{4\pi(6378^2)}=g g=9,838,028 If I did the math right, can anyone tell me what this...

I need to find the force on a hemisphere below a certain height H in water. The hemisphere is resting at the bottom. The radius of the hsphere is r. I think i need to use dF = dPdA and use spherical coordinates to integrate but do not know how to form the triple integral required!

This is the diagram of the mechanical system that i want to calculate the pump and the full Hydraulic system for it ... calculating of pressure and the pump pressure and the electriacal motore for the that H. Pump for holding the coil

I have a seesaw style catapult. the arms are at a 4 to 1 ratio. I have all the masses and everything, the hacky is 50 grams, and The beam is 381 grams with a length of 50 cm (1 arm is 40 other is 10). My velocity to launch the hacky 2.5 meters away from the release point and have it land...

How do professional scientists make sophisticated calculations, e.g the http://arxiv.org/PS_cache/math-ph/pdf/0412/0412064.pdf in general relativity? Are there any special algorithms for this? I'd really like to solve these equations but it's almost impossible without computer help.

A pully with radius .2 m is fixed on a shaft and on the other end there's a gear with radius .01 m. If a force of .01 N pulls down on the pully, what's the force on the tip of the small gear? Here's my work: The force produces a torque about the shaft T = Fr = (.01 N)(.2 m)= .002 Nm The...

is there any easy way, or relatively easy way, to calculate how much power is stored in a certain amount of air with a certain amount of pressure and flow? i know that's VERY vague, so let's say (random number's being chosen...) 30 psi at 100 cfm.