Rate Definition and 1000 Threads

Homework Statement The Attempt at a Solution As far as I know those are correct. Could I have some assistance on how to solve for the rate of change? I know the formula is f(b)-f(a)/b-a but not sure how to go about it

Homework Statement http://postimg.org/image/4ctgrkoop/ I don't understand the final bit, for the 'steady rate of heat transfer for the entire fin', how they went from Fourier's Law to that final expression. Homework EquationsThe Attempt at a Solution I think it involves the previous expression...

Assume that I have absolutely no clue to what is the formula used to generate a sequence. How do I know what kind of formula that is? (Exponential / Linear / Polynomial / etc) Also assume that there is only 1 formula that generates the sequence. I have read somewhere before that: f'(x) ~...

I am helping one of my old physics professor and his Phd design a low-atmospheric vacuum chamber and we're looking at different materials to prevent outgassing. However the tank is almost 1m long and all the equipment inside must be taken out and checked after each test. It would be nice if we...

Currently i have a system using bulk argon and i am changing to nitrogen. To trial this i am going to use cylinders of OFN(oxygen free nitrogen). how do i caculate how many cylinders i need based on a flow rate of 16 liters/min. Thanks

The question is: The rate equation for the reaction A2 + B2 -> 2C (all gases) is rate = k[A2]2[B2]. If the gaseous reaction misture is compressed to half its original volume, by what factor will the reaction rate change. Assume temperature is constant. My thoughts are that the reaction rate...

Homework Statement The problem I have is not actually so much a physics problem but more of a logical problem. When we look at rulers and any kind of measuring tools, we start from zero. We count the number of intervals instead of the divisions. Suppose we have a video with 7 frames per...

Homework Statement The rate constant for the conversion of methyl isonitrile is 5 x 10^-5. A scientist has a container containing this substance with a partial pressure of 100 torr. After 12.8 hours (46,000 seconds), what is the partial pressure of methyl isonitrile gas inside the container...

Homework Statement Homework Equations Rate of change formula: y2-y1/x2-y2 The Attempt at a Solution If this is a rate of change problem so I use the rate of change formula: y2-y1/x2-y2 and since it's from 2 to 4 I think that would be (2,0) (4,0) and thus (0-0)/(4-2) = 0/2 = 0 I don't...

Why in the Law of Mass Action we raise the concentrations of the reactants to the power of their coefficients according to the stoichiometry of the chemical reaction, while the order of the reaction must be determined experimentally ? I may not understand the difference between them.

Homework Statement I am trying to understand how to obtain the estimated detection rate of a WIMP of mass 100~GeV into a Germanium detector of 1kg and detection efficiency of P_{eff}=70 \% . Homework Equations If you have at hand that the cross section is given \sigma = \mu_R G_F^2 (I...

Im having trouble with this problem to do with applictions of calculus. If two resistors with resistances R1 and R2 are connected in parallel, then the total resistance R measured in ohms (Ω), is given by 1R=1R1+1R2. If R1 and R2 are increasing at rates of 0.4Ω/s and 0.6Ω/s respectively, how...

Homework Statement I didn't know if this was considered "advanced" physics, but it's an intermediate classical mechanics course so I'll just post my question here. Basically, if you have a cardioid ##r(\theta)=k(1+\cos(\theta))##, you can show that the ##\dot{\theta}=\frac{v}{\sqrt{2kr}}##...

Hello there, so I have answered my question from fluid systems but the answer doesn't look right ;/ and I have no idea what have I done wrong. Can you please check and correct where it's wrong ? ;) here is the question: A pipe contains a gradually tapering section in which its diameter decreases...

I am confused about the relation of mass flow rate with different mach numbers in a compressible flow. In wikipedia (http://en.wikipedia.org/wiki/Choked_flow), I read the following: "Although the gas velocity reaches a maximum and becomes choked, the mass flow rate is not choked. The mass flow...

Hi, Can anyone explain me that in chemical kinetics, the rate of reaction can be determined by just determining the rate of any reactant of product involved in the reaction, but how? How the rate of change of concentration of just one specie can tell you about the whole reaction? I found the...

Hi, I have a question regarding the flow rate in a pipe. According to the general rule the flow rate is: Q = v * A where Q [m3/s] v [m/s] A [m2] So according to this formula the flow rate depends only on the inner area of the pipe and the velocity of the fluid and does...

Homework Statement Hello, I have really hard time to express the gas law PV=nRT to PQ=ṁRT where Q is volumetric flow rate and ṁ- mass flow rate. Is it possible ? Teacher told me, it is ... Homework EquationsThe Attempt at a Solution

Hi, I'm not sure if I'm posting in the right spot but I'm going to guess this is an easy question for you all. I'm going to give as much detail as I can, maybe too much.. My 2 family house condo has a single 2" or 3" water supply from the street. It is split to supply the first floor and...

Just a general inquiry, and not for any personal gain and or theory, I would like to know if anyone has developed a formula for measuring the vibrational rate of an atom.

Can anybody tell me about the book 'Quantum Physics' by Stephen Gasiorowicz? You can give some comparison with other books such as Griffiths or Shankar's QM book.

Homework Statement At what rate of interest, compounded continuously, will a bank deposit double in value in 8 years? Homework Equations None. The Attempt at a Solution Q0e8r=2Q0 e8r=2 8r=ln(2) r=ln(2)/8 But the answer is (25/2)ln(2)%. How do I get the answer from there?

I'm designing a testing unit where I need to estimate the smallest diameter of a short complex pipe (around 1 meter, three bends and some diameter viariations). Since the pipe is being cooled down in a water bath after production, my idea is to force water with a known pressure in one end of the...

Homework Statement 2 KClO3 (s) + heat --> 2 KCl (s) + 3 O2 (g) If 0.20 g of KClO3 (s) decomposes in 2.8 s, at what rate is oxygen O2 (g) released over this time at SATP? Homework Equations n = PV/RT The Attempt at a Solution Converted KClO3 to mol. .20 x 1 / 122.5495g = 0.001632 mol...

I Think I understand this, but when I look it up, I keep reading about work done and energy used, which puzzles me. The simple way I have always thought about it is, when you expand a gas you also expand the heat it contains, so while it contains the same amount of heat, it's concentration...

Hi, I'm looking at deriving the limits of ##\dot{a}## as ## a-> \infty ## , using the Friedmann equation and conservtion of the ##_{00}## component of the energy momentum tensor for a perfect fluid. Both of these equations respectively are: ## \dot{a^{2}}=\frac{8\pi G}{3} \rho a^{2} + | k |##...

I am interested in mass flow rate in conveyor screw transportation http://www.colormaxsystems.com/wp-content/uploads/2013/11/5-screws-300x222.jpg any recommended book,engineering guides ?

Is it possible to calculate the max flow rate (gals/m) achievable through a given piping system with only the following variables? - 4" SDR 11 HDPE pipe (3.633" ID) - 28,000 feet of pipe from source to destination - 90' of elevation change from source to destination - destination is another...

Hi I need to work out a flow rate of a fire hydrant in Liters per second. I know the pressure is 3.5bar and the pipe diameter is 100mm Any help would be appreciated Thanks

Homework Statement The production of a product P from a particular gram negative bacteria follows the Monod growth law $$-r_{S} = \frac {\mu_{max}C_{S}C_{C}}{K_{M}+C_{S}}$$ with ##\mu_{max} = 1 \hspace{0.05 in} hr^{-1}##, ##K_{M} = 0.25 \hspace{0.05 in} g/L##, and ##Y_{C/S} = 0.5 \hspace{0.05...

Is there a general or approximative equation for the loss of mass, of a meteorite as it travels through the atmosphere? For example as a function of something like its speed, surface area, the drag force experienced by the meteorite.

I've been reading about dissipation of energy in turbulent flows. I've read in various places about Richardson's idea of Energy cascade. But one of the biggest problems I have is understanding how the books (or texts online) all refer to ϵ, the rate of dissipation of kinetic energy, being...

Hello, I am having some confusion over elementary rate laws. This is a hydrodealkylation reaction. The specific reaction rates k1 and k4 are defined w.r.t. H2. If I want to write the rate law for the hydrogen radical for the termination step, would the elementary rate law be ##r_{H \bullet}...

Homework Statement The rate law for the reaction is found from experiment to be Suggest a mechanism consistent with the rate law. Homework EquationsThe Attempt at a Solution Here is the webpage with the solution http://www.umich.edu/~elements/07chap/frames.htm Here is the solution Rate...

If I have a pump of 50psi and 2L/min flow rate and it is connected to a nozzle. The nozzle catalogue specs for example shows that : 40psi = 0.5L/min 50psi = 0.6L/min 60psi = 0.7L/min Is flow rate at the nozzle output 0.6L/min? Regardless of the pump flow rate, as long as pressure are same...

Hey guys, can some of ou help me with this question: I need to calculate the volumic flow rate for air by using the ideal gas law. Things i know from the assignment: molarmass = 28,96 kg/kmol Pressure = 1 bar mass flow = 2 kg/s t in = 20 degrees celcius t out = 50 degrees celcius (sorry for bad...

For a situation where we have two infinite flat parallel plates with a viscous fluid in between if the upper plate if acted upon by a constant force then the plate should accelerate. The fluid layer adjacently below the upper plate should have the same acceleration as this plate (due to no-slip...

Is there any observational data available for evolution of Hubble rate? To give some context, read the dark energy FAQ by Sean Caroll here. He says: "If the universe is decelerating, the Hubble constant is decreasing. If the Hubble constant is increasing, the universe is accelerating. But...

I'm new here, and I have a question that might be easy but really confuses me. Does the volumetric flow rate of incompressible fluid change across a valve?. Based on my analysis, no it can not change since the mass is conserved, and since it's incompressible fluid. I know that the velocity will...

Hey guys, I've been asking around trying to see what schools on my list are 'reach', 'safety', or 'matches' for my profile. I was wondering if you guys could take a look and let me know if there's something that's too crazy or well within reach (or if I should just wait 'till next semester based...

Homework Statement Homework EquationsThe Attempt at a Solution

I've noticed that certain propane torches will have a seemingly linear relationship between their PSI and BTU/hr. IE, 18 PSI -> 220,000 BTU/hr. From this a person could calculate how much gas is being burned per sec/minute/hr. So, is there a general relationship/formula that I can use to...

I am looking at air system that is under a constant pressure of 350 mbar into a pipe that has 40 - 2 mm round holes. Is there a formula that I can use to calculate the total volume of air nm3/hr that will escape the system? Let's just say the air temp is constant. Can anyone help with this?

Hi, I came across a question in an exam which I couldn't really relate to any topic of physics, that I had studied. It goes like this- A detector is used to count the number of gamma rays emitted by a radioactive source. If the number of counts recorded in exactly 20 seconds is 10000, the...

Homework Statement A vertical jet of water of 3cm in diameter impinges upon a horizontal flat plate with a velocity of 4m/s, and all of the water spreads out horizontally. Find the force exerted on the plate. Homework EquationsThe Attempt at a Solution I am not 100% sure how to tackle this...

I am trying to find out what is the best method / correct formula to calculate Flow rate at inlet/outlet when pressure is known. Please see attached image. any help would be greatly appreciated. Note: Flow Rate can Vary from 100 sccm to 500 sccm.

Determine the average rate if change of the function y = 2cos(x - $\pi$/3) + 1 for the interval $\pi$/3 $\le$ x $\le$ $\pi$/2 I tried finding the exact values of the two (0 and 0.5) and subbing them into the AROC equation but I keep getting the wrong answer (1.4)

I just started using this heart rate monitor, with the strap around the chest and the watch that you wear. I can't help suspecting that its just following my strides on the treadmill though, and also, if this is possible? How accurate are these monitors anyway, and how do they work? The...

Hello, I have question about "so called" non-dimensional accretion rate, mostly known as λ. In Shapiro,Teukolsky 14.3. is made an overview but, λ is just defined, but I don't know why? Why do we need it? What is good for?

Homework Statement The second-order rate constant for the reaction A+2B --> 2C+D is 0.34 dm3/mol s. What is the concentration of C after 20 s and 15 min if the initial concentrations were [A] = 0.027 mol/dm3 and [ B] = 0.130 mol/dm3 Homework Equations The integrated rate law for A+2B --> P...