Rate Definition and 1000 Threads

Hi, I am mike from australia, I am new to the forums and am having trouble answering the question below, I have included some information on the experiment as well. You are given a water bottle with a pin sized hole in the bottom, and a line drawn around the bottle at the level that 50cm3 of...

Hi everyone I searched about the mass flow rates and temperatures of exhaust gases of light gasoline internal combustion engine at different condition but I don't fond anything yet . Anyone can guide me? .

Hello, My professor just gave us a True or False problem that states: ∇H(x,y), the gradient vector of H(x,y), gives us the largest possible rate of change of H at (x,y). Now, he said the answer is true, but it was my understanding that the gradient itself gives the direction of where the...

can we use frequency and time period terms for digital signals or we have to use bit rate and bit interval terms for digital signal. in simple words,

If someone was splashed with 5 ml of reactor pool water over 10 cm^2 of there skin, how much dose they will receive? note: the tritium was created in the reactor pool water. Also if they swallowed 125 ml of pool water how much dose they will receive ? Thanks.

which has different radiuses at both end. Its actually two pipes merging after the entrance going straight and somewhere close to middle of the pipe it's bent 90°. So for simple pipes it's =4*Q π*r^3 But what for the pipe I...

The problem is: The temperature (in degrees Celsius) of a metal plate, located in the xy -plane, at any point (x, y ) is given by the function of two variables T(x, y ) = x sin y + y2 sin x. (a) Find the rate of change in temperature in the direction of the positive x-axis at the point (π, π)...

http://antoine.frostburg.edu/chem/senese/101/kinetics/faq/temperature-and-reaction-rate.shtml According to Rule of Thumb, the reaction rate doubles when there is a 10 degree rise in temperature. I want to determine the activation energy for a lab, but my level of study is not advanced enough...

My question is simply..if force does equate to the rate of change of momentum, then why is it not taughted as this rate rather simply a push or pull? Is it becuase really they are the same thing and it is much easy to explain/work with? Just curious Guess up until now I didn't even think of...

Hello everyone, I have a question about nuclear fusion. Deuterium-Tritium fusion generates 3.4 * 1014 J/kg when you have a mixture of around 400 grams of deuterium and 600 grams of tritium. My question is: what is the rate at which this fusion reaction takes place? Is there a formula for the...

Homework Statement . Air, at a flow rate of 30 [N/s], flows through the reducer shown below. In the 300 [mm] diameter section of the pipe the specific weight of the air is 9.8 [N/m3 ]. When flowing through the reducer the pressure and temperature will fall causing the air to expand and...

Hello Everyone, I have a question regarding the diffusion of a gas (or mixture of gases) into an evacuated space. The situation I am picturing is one where you have two vessels of equal volume, one contains a gas at room temperature, some known pressure (say ~760torr), and the other at static...

Homework Statement Data in the table were collected at 300 K for the following reaction: A(g) + B(g) → products Concentration of A 1.00 0.100 1.100 Concentration of B 0.100 0.100 1.00 Initial Rate (M/s) 1.29x10^-29 1.33x10^-30 1.30x10^-29...

Homework Statement At what rate does a 0.1m cube of metal with emissivity e=0.75 radiate energy if it is at a temperature of 200C? Homework Equations H=AeσT^4, σ=5.67 x10^-8 The Attempt at a Solution I found the area of the cute to be A=(0.1m)^2=0.01m, and the turned 200C into 473K, but when...

If one were to apply, for example, 60 Hz AC to a piezoelectric material, would the strain rate be 60 Hz? I am not entirely sure if I am using "strain rate" in its proper sense; I use it merely to describe what I imagine would be the rate at which the material expands and contracts while exposed...

I am trying to understand the concept of convective heat transfer. I plugged in some values into the convective heat equation and ended up with q = 40. Now, I don't know what that means. What does that tell me about how long it would take to bring a given volume of air around a hot surface to...

1. Homework Statement This is an Astrometry problem. I am not sure or how exactly to proceed: Data: First off, I am unsure which data points to use. Should I use the values from right ascension or the values from the time index. 1 hour = 15 degrees 24 hours = 360 degrees Image 01...

I am trying to come up with a mathematical model so that, when the displacement of the plunger of a syringe is know, I can calculate the amount of a specific liquid in the barrel. Or the relationship between the speed of the plunger and flow rate at the tip of the needle (Again assuming that the...

I admit that I do not have much knowledge pertaining to relativity and space expansion, however I do know that all speeds are relative excluding light. This makes sense to me, however a new article published says that "Space itself is pulling apart at the seams, expanding at a rate of 74.3 plus...

Homework Statement N2O4 --------------> NO2 N2O4 for k = 0.050 s-1 The process starts from 0.20 mole of N2O4 in a container of 4.0L. Calculate v for N2O4. if 3/4 of the N2O4 is converted Homework Equations To calculate concentration c= mole/L The Attempt at a Solution 0.20 mole /4.0 L...

If there are any experimentalists out there maybe you could help? I need to bubble gas through a liquid at ~80 mL/min is there a specific instrument designed to do this? I'm assuming it's some sort of pump, what would it be called in a chemistry lab? Thank you for any suggestions / help.

Hi, First-timer here! I'm designing a physics project that involves pumping a certain pressure of air into an empty bottle. SETUP: The bottom of the bottle has a small hole through which a thumb tack fits tightly; the top (cap-side) has a valve through which the air is inserted. The bottle is...

Hi guys, I was wondering if you could help me with something. I work in the paper industry with what is called a suction roll. The roll has a rotating perforated steel cylinder with a stationary vacuum box on the inside and as the wet paper web travels over the surface of the roll, the vacuum...

The question is: Which takes place when a catalyst is added to a reaction at equilibrium? A. The point of equilibrium is shifted to the right. B. The point of equilibrium is shifted to the left. C. The forward and reverse reactions rates are increased unequally. D. The forward and reverse...

Homework Statement what is G and γ mean here ? Homework EquationsThe Attempt at a Solution

Homework Statement Which will undergo faster Williamson ether syntehsis It was either faster or better, I'm not sure A)3-Chlorobutan-1-ene B)1-Bromobutane Homework EquationsThe Attempt at a Solution I thought option A because of its alylic position it will form a stable carbocation (and...

Homework Statement An turbine expands air at 1300 kPa and 500oC to 100 kPa and 127oC. Air enters the turbine through a 0.2-m2 opening with an average velocity of 50 m/s, and exhausts through a 1-m2 opening. Determine (a) the mass flow rate of air through the turbine Homework Equations PV=RT m...

Homework Statement A golfer sinks a hole-in-one on a mini-putt golf course. The ball leaves the putter face with a speed of 4.04 m/s, travels a distance of L1 = 4.38 m, and bumps into a bank with a speed of 3.34 m/s, rebounds at 90° and travels a length of L2 = 3.26 m into the hole. Assuming a...

I can't seem to find an answer anywhere to this just by searching. I'm trying to understand samplerate more thoroughly. I know 44000 samples per second means that the highest frequency that can be recorded is 22000 hz but what is each sample? Does it mean there is a constant 44000 snippets of...

Hi everyone, and happy new year! A colleague at work came up with this problem today, which I find very interesting. We are both chemists, so our ability to solve it is limited - here I am asking for your help! In a target discovery campaign that we run, we have two separate tests, let's call...

A car going 25 mph with studded tires on packed powder stops in 20 meters. What will be the stopping distance if it is going 20 mph? We do not know the mass of the car, but perhaps it is accurate to create an acceleration constant that will apply for other speeds? a=v/t and v=d/t so therefore...

I don't know how to determine the fuel consumption rate of a gas burner and would like to seek for help. Also, is there any relationship between the number of rings of gas burner and the fuel consumption rate?

Homework Statement At a moment in time a particle has a velocity of v = 3 m/s î + 4 m/s ĵ, and an acceleration of a = 6 m/s2 î + 3 m/s2 ĵ. Find the rate of change of the speed of the particle, that is, find d|v|/dt. (better formatted reference...

Sir, Kindly let me know how to calculate flow rate (cfm or Litre/m) of air flowing through a pipe of 12 mm dia from a reservoir at pressure 7 kg/cm2 to atmosphere. i.e ;- how much volume of compressed air could pass within a minute through a "X"mm dia pipe from a constant pressure (7 kg/cm2)...

Homework Statement I have a problem when doing math for pulley problems - if not at least one of the rope segments in independent, I do not seem to be able to compute the speed of given objects. For instance: This is a very easy problem. Sa+3Sb=l and derive for speed; you don't really...

Homework Statement Imagine that you are blowing air through a straw in a cup of water and the root of the straw was connected through a rectangular box with empty base and every side of the rectangular box was cut into "teeth" shape. Bubbles will come out from the teeth of the rectangular box...

I'm really confused by this question, as it is different than the examples we did in class. I've compared my answer with a few classmates and I'm getting a different one, so I'm not sure if I've done it wrong or if they have. I'd really just like to know if I am on the right track! Thank you :)...

Homework Statement It is fairly easy to produce a static magnetic field of 0.050T in the lab. If an EM wave could be produced with maximum magnetic field, Bo = 0.050T a) what would be the rate of energy transfer (W/m2) ? b) what would the corresponding maximum electric field be? Note * Air...

Hi, I'm trying to solve this problem and it's driving me a little crazy. Any help greatly appreciated. Q) A lift travels to the top of a tower through a vertical displacement of 48 m. The total journey takes 17 s. The lift accelerates from rest at a constant rate for the first 5 seconds. Then...

CH3Br + Nu- → CH3Nu + Br- The decreasing order of the rate of the above reaction with the following nucleophiles is: [ Nu = (I) PhO- (II) AcO- (III) HO- (IV) CH3O- ] My answer is IV > III > II > I However the answer is IV > III > I > II I'm having a hard time understanding why...

Homework Statement At a processing plant, olive oil of density 875 kg/m3 flows in a horizontal section of hose that constricts from a diameter of 2.92 cm to a diameter of 1.20 cm. Assume steady, ideal flow. What is the volume flow rate if the change in pressure between the two sections of hose...

I would just like to know if i have worked out one cardiac cycle and heart rate correctly. I have attached the image of the ecg called 'after exercise' here are my workings out: 1. CARDIAC CYCLE: there are 4 cycles so: 9 (grids) x 0.05 = 0.45 9x 0.05 = 0.45 9x 0.05 = 0.45 9x 0.05 = 0.45...

Homework Statement A muon decays to an electron, an electron neutrino and a muon neutrino. ## \mu \rightarrow e \ \nu_\mu \ \nu_e## .The matrix element of the process is ## |\mathcal{M}|^2 = G^2_F (m^2-2mE)mE## with ##m## being the mass of the muon and ##E## the energy of the resulting...

I have a logistic growth problem. I know this because there is an upper limit of approximately 21,000 people. I need to calculate growth rate. Would it be something as simple as taking two populations and dividing them to get the rate (X2-X1/X1) to obtain it or is there an equation I am missing...

Hi I was thinking of doing an experiment for my maths coursework to plot a graph to, and was thinking of doing something related to the rate of evaporation of water. My thinking is that i conduct an experiment where I heat water to boiling point so it is at about a constant temperature with a...

Homework Statement If the skin temperature and altitude are constant, and the lapse rate increases from 5.5˚C/km to 6.5˚C/km, the ground temperature: A) increases B) decreases C) remains unchanged D) is never constant Homework Equations lapse rate=-dT/dh The Attempt at a Solution I think it...

Homework Statement [/B] I don' t want to be too specific, but it's basically "A + B -> C has the rate law Rate=k[A][ B], How long does it take [A] to reach concentration X. K is given and the initial concentrations of A and B are given." Homework Equations The integrated rate laws, whether I...

Hi, I'm building an experimental set-up for some heat exchanger I'm trying to analyze, I want to maximize the flow through this little piece. I have a stable temperature bath, (see picture) that has an evacuation valve on the bottom. I only took introduction to Fluid Dynamics (found it amazing...

Homework Statement For the following Markov chain, find the rate of convergence to the stationary distribution: \begin{bmatrix} 0.4 & 0.6 \\ 1 & 0 \end{bmatrix} Homework Equations none The Attempt at a Solution I found the eigenvalues which were \lambda_1=-.6 or \lambda_2=1 . The...

Hi! This is my first post and I'm hoping to receive so help :D If f(x)=\frac{1}{{x}^{2}+1}. The rate of change of f at a is defined as \lim_{{h}\to{0}}\frac{f(a+h)-f(a)}{h}. In case, these commands don't work properly... the question is: if f(x)=1/(x^2+1) and rate of change of f at a is defined...