What is Rate: Definition and 1000 Discussions

The Institute for Creation Research (ICR) is a Creationist apologetics institute in Dallas, Texas that specializes in media promotion of pseudoscientific creation science and interpretation of the Genesis creation narrative as a historical event. The ICR adopts the Bible as an inerrant and literal documentary of scientific and historical fact as well as religious and moral truths, and espouses a Young Earth creationist worldview. It rejects evolutionary biology, which it views as a corrupting moral and social influence and threat to religious belief. The ICR was formed by Henry M. Morris in 1972 following an organizational split with the Creation Science Research Center (CSRC).Its work in the field of creation science has been rejected by mainstream science, but has been significant in shaping creationist thought in the United States by introducing creation science through fundamentalist churches and religious schools, and by engaging in public debates against supporters of evolution. The ICR also offers unaccredited graduate level programs in Biblical Apologetics, including a minor in Creation Research. The ICR also operates the ICR Discovery Center for Science & Earth History museum in Dallas, Texas.

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  1. I

    Light propagates faster than the rate of expansion of the universe?

    I know the universe doesn't expand at a speed but rather a rate over distance but if we take two objects on opposite sides of the observable universe, would they be moving away from each other at a greater rate than light? IE if object A was a star and object B was a planet, would the light...
  2. X

    3-Level Rate Equation modelling using Matlab

    Hello everyone, I'm new here and new to Matlab. I hope I do place the post in the right place. First of all, thanks for viewing my post. Please bear with my English. I tried my best to explain everything clear. If you have any question about anything I wrote or spot any fault, please tell...
  3. gfd43tg

    Change in concentration vs. reaction rate

    Hello, I am wondering, why is it that ##\frac {d[C]}{dt} \ne k[C]## in general, where ##C## is a chemical species, and the product ##k[C]## is the reaction rate, ##r##. ##r_{c} = k[C]## My thoughts is that because the units aren't necessarily the same, therefore they can't be the same. But I...
  4. F

    Effect of Adding Water on Reaction Rate: Rate Law Theory Question

    Homework Statement Consider: A(aq) + D(l) -> B(aq) + C(aq) Rate Law: k[H+][A] Does the rate increase, decrease, or stay the same, when 500mL of water are added to the solution? Homework Equations The Attempt at a Solution My thought was no. The water doesn't have any effect on the chemical...
  5. K

    MHB False Positive Rate of 1:1.5M Sampling Process

    I have a sampling process of a very large population in which all items are of type A or type B. I have an analysis of the sampled objects which classifies type A and gives the wrong identification (a false positive) 1 in 1.5 million times. I take a sample of 1 million and find 1 'hit' i.e...
  6. G

    Flow rate in a gravity fed water pipeline

    Hi everyone, First post here. Was hoping for some help from a pipeline guru. I am looking into the maximum flow for a pipeline from a reservoir to an outlet about 40m lower. The way I have been looking at it is what is elevation head of the reservoir surface and that is effectively the...
  7. J

    Calculating 32mm Pipe Filling Rate

    Hi, How to calculate the filling rate of 32mm dia pipe(15m length) arrange vertically from ground to second floor with 0.2bar pressure from main supply? the storage tank capacity is 200gal at the roof of second floor. Tq
  8. Teemo

    Rate of Reaction with Respect to Temperature

    Homework Statement The rate of a reaction at 100˚C is four times the rate at 50˚C. What is its activation energy? (A) 1152 kJ. mol-1 (B) 80.1 kJ. mol-1 (C) 54.0 kJ. mol-1 (D) 27.8 kJ. mol-1 Homework Equations k=e-Ea/RT The Attempt at a Solution I plugged in the activation...
  9. S

    Reaction rate from added vibrational energy

    I have a molecule with a certain kinetic, vibrational, and rotational energy. It absorbs a photon which excites a vibrational mode. I want to find an equation that describes how the molecules reaction rate with another molecule might change given the added vibrational energy. Is there a name...
  10. N

    Does pressure have anything to do with flow rate?

    Homework Statement For example, let's say we have a container and then we have a hole in the side of the container. Water that is in the container will have a greater flow speed at the hole of the container than let's say at the top of the container, Point A. (point A is subject to...
  11. I

    Equation for heat transfer rate

    Hi, I am trying to create an apparatus to measure the thermal conductivity of woody pellet based on peltier effect. the fundamental equation for thermal conductivity is Q"=kA(Δt/Δl), where k is thermal conductivity. A is the area of pellet, Δt is measured by using thermocouple and peltier...
  12. P

    Calculate Flow Rate: Find Water Velocity & Qty Collected

    Homework Statement I am trying to calculate the flow rate of the following setup. A bottle with water (density = 1000 kg/m^3) is on a lab stand, and has rubber tubing at the end of the bottle coming down to the benchtop. The top of the water is 17 inches above the benchtop. You insert a...
  13. Z

    MHB Angle change rate is a function of the instantaneous angle

    Dear All, I have an integration probelm and I hope to find a solution for. I assume that an objects moves vertically in the +ive direction of the $y$ axis, from $x=a$, with constant speed $v$. I monitor the rate of change of the angle $\theta\left({t}\right)$. I have derived this rate to be...
  14. S

    How to increase reaction rate using EM radiation?

    I want to pump energy into a chemical species to increase its reaction cross section with another. Typically these species react upon collision when their relative kinetic energy exceeds the activation energy. I want to find a way to increase the reaction rate for interactions at slower...
  15. M

    Exploring the Mystery of Expanding Galaxy Rates

    We know that distant galaxies (which are expanding) are sometimes expanding at rates that do not conform with our known theories and formulas developed by our own observations of gravity. Einstein's theory is of course at the forefront of this conundrum. To explain it some believe that we...
  16. karush

    MHB What is the rate of change of s with respect to time when y=π/2 radians?

    https://www.physicsforums.com/attachments/2883 It was found earlier that $ \frac{dx}{dt}=\frac{\pi}{30} \frac{rad}{sec} $ and $\frac{dy}{dx}=\frac{\pi}{60} \frac{rad}{sec}$ (C) since $s$ and $x$ and are related by the Law of Cosines; What is the rate of change of with respect to time...
  17. S

    Compressed gas flow rate calculation

    Folks, I'm new to this thread. I'm a mechanical engineer, but I haven't done much fluids work since I graduated, 20 years ago. I have a question about calculating gas flow rate, so any help would be greatly appreciated. I have a design that I'm working on that will use a compressed gas...
  18. N

    Calculating Flow Rate: Pressure Source to Converging Nozzle

    Hey everyone, sorry I posted this in two different forums. I think this forum was more applicable so I wanted to move it. I have a fluid system of water coming from a pressure source. Then there is a converging nozzle, which I have calculated the resistance coefficient using Crane's Manual...
  19. N

    Calculating Flow Rate in a Converging Nozzle System

    Hey everyone, I have a fluid system of water coming from a pressure source. Then there is a converging nozzle, which I have calculated the resistance coefficient using Crane's Manual and it has an outlet to the atmosphere. I have tried to simplify the system. The full system is a pressure...
  20. steves1080

    Calculate flow rate in parallel pipes

    So I have a 30" pipe that splits into 3 parallel paths, each 24" in dia. The pipes converge into a 30" outlet and then flows at about 40,000 gallons per minute at full head pressure. Assuming the same head pressure and one path closed off (i.e. now only flowing through 2 parallel paths), how...
  21. davidbenari

    Flow rate is calculated using only the parallel velocity

    So flow rate is calculated using only the parallel velocity to the area vector. Why is this? How can I mathematically prove this? Namely, how do I prove any perpendicular component of the velocity vector is not contributing to any volume output? I know this is the result of the dot product; I...
  22. K

    Does discrete logic equation ignore death rate during off season?

    Observation of the growth of some beetle population suggests that discrete logistic equation would be more appropriate since these animals have distinct breeding season. discrete logistic equation: Xn+1=Xn+rXn(1-(X2/K)) the result of this equation accounts for population only season to...
  23. S

    Rate my professor and the psychological impact.

    How accurate do you think are the assessments made by students on this website??I had nothing but good things to say about all my professors. When I started in community college last year I joined late and had to take the professors whose classes were available. I did not even bother to check...
  24. K

    A spherical raindrops evaporates at rate proportional to surface area?

    i want to find V(t) At first i found this problem was very simple but when i try to write differential equations i ended up with these V' = kA that's for sure then i confined the problem only to spherical shape and no other shapes of raindrops involved as i can't express A in term of V alone(...
  25. T

    Equilibrium Question - at what rate does the block accelerate?

    Homework Statement A force is applied to a box 60 degrees from the horizontal. The box weights 5kg. If the force is 120N, and the surface upon which the box rests upon is frictionless, at what rate does the block accelerate? Homework Equations Fnet = ma Fg= mg The Attempt...
  26. V

    Laser rate equation using ode45

    Hi, I've attached the problem that I'm trying to solve. I've also done the manual calculations to calculate Ithreshold. I'm not very good with MATLAB and I need MATLAB code for laser rate equations and I also need to plot LI characteristic of the laser. I_th=qV/(η_i τ) N_th=qV/(η_i τ)...
  27. T

    Rate of expansion of the universe

    So I know that the rate of expansion of the universe is increasing, i.e. the 2nd time derivative of the size of the universe is positive. But, is the next time derivative (i.e. 3nd time derivative of the size of the universe) positive of negative? Do we have enough information to determine this...
  28. marcus

    Concordance value of Hubble growth rate (2014)

    There has been a flood of new data. Cosmologists have not yet settled on a new agreed value of H0. This may help lead to one. http://arxiv.org/abs/1406.1718 The 1% Concordance Hubble Constant C. L. Bennett (1), D. Larson (1), J. L. Weiland (1), G. Hinshaw (2) ((1) Johns Hopkins University, (2)...
  29. E

    Longitudinal strain rate derivation

    Hi, The attachment below is about strain rate in fluids*. It shows how the strain rate d\phi/dt is related to the velocity field derivative du/dx when you stretch the element in x (i.e. longitudinal strain). It has no intermediate steps, and I can't see how the angle has been related to...
  30. L

    Determine the strain rate for a material fiber

    Homework Statement Determine the Strain Rate for a Material Fiber in the direction of the surface normal. The Velocity Field is V=((4y-3x)i+(5x+3y)j) ft/s http://puu.sh/9hQ7Q/2bda80620f.jpg is the picture which describes a steady, planar flow where i and j are unit vectors. Homework...
  31. J

    Compressed air flow rate from pipe to container

    Hello All,I was given a problem today that I could use some guidance on. I have a compressed air pipe flowing into a container. This container has a pressure of 5 psi while the pipe has a pressure of 90 psi. There is a valve that controls when the air is released into the vessel and only...
  32. D

    MHB Solve Work Rate Problem: Find A and B's Time Alone

    I just want an alternative solution(preferably easier approach) to this problem "A" can finish a job two hours longer than "B". After working for 1 hour, "B" joins him and they complete the job in 3 more hours. How long would it take "A" and "B" to finish a similar job if each worked alone...
  33. R

    What is the flow rate through a capillary tube?

    Hi, I was wondering if there was an equation for the flow rate through a straight vertical or angled capillary tube. All I can find is how to calculate the height it rises but I would like to know how to find the rate it rises. I imagine it is not a steady rate since it must stop once it...
  34. T

    Finding rate of change of moment of inertia tensor

    Homework Statement The Wikipedia article on spatial rigid body dynamics derives the equation of motion \boldsymbol\tau = [I]\boldsymbol\alpha + \boldsymbol\omega\times[I]\boldsymbol\omega from \sum_{i=1}^n \boldsymbol\Delta\mathbf{r}_i\times (m_i\mathbf{a}_i). But, there is another way to...
  35. M

    Laser rate equation using matlab

    Hi, is there anyone familiar with rate equation solving using Matlab? I need help on this
  36. ABunyip

    Time Slowing Rate & Gravity: A Derivation

    I want to consider the rate at which time slows as gravity increases near a massive object such as a sun or even a black hole. Obviously there is a distance component here but I am after a generalisation that simply shows the relationship between time and gravity (ought to be possible)...
  37. W

    Low volumetric flow rate measurement

    Hi everyone, I'm currently a mechanical engineer interning at an HVAC company. I need to measure the resistance of a fluid through ductwork. The CFD shows a linear curve through a plenum when plotting R vs volumetric flow rate. For example, a straight rectangular box 1 1/16” by 2.5” and 3ft...
  38. J

    Rate of change of the gravitational force.

    Homework Statement The space shuttle Endeavor is moving at a speed of 27870 Km / h. At takeoff, its mass is 2, 28 * 10 ^ 6 kg, however, its mass decreases as it uses its fuel: the engine burns liquid oxygen which has a density of 1141 kg / m^3, at a rate of 1340 liters per second. Calculate...
  39. L

    How Does Valve Opening Affect Flow Rate from a Pressurized Tank?

    Hello, Im a student and I try to design a valve connected to a tank. However I have some troubles to define the phenomena. I have a pressurized tank with air at 100 bar and I would like to know the evolution of the flow rate through the opened valve. The valve outlet is at the atmospheric...
  40. M

    Calling kinetics experts: rate law from conductivity isnt possible?

    Calling kinetics experts: rate law from conductivity isn't possible!? Consider the usual primary halogenoalkane aqueous alkaline hydrolysis reaction RX + OH- --> ROH + X- We know the rate law is first order in RX and OH-. We could separately represent the drop in OH- conductivity as an...
  41. S

    Bernoulli's principle, flow rate, velocity and pressure

    Hello, I need some help understanding Bernoulli's principle, flow rate, velocity and pressure. I understand that when the diameter of a pipe decreases, the velocity will increase and the pressure will decrease. But I am having a hard time applying this to a practical application. For...
  42. X

    Heat transfer rate from Mild steel bars to a chilled water tank issue

    Homework Statement Hi all, I am helping in designing a conveyor that takes freshly milled mild steel bars and submerges them in a tank of cooled water to reduce their temperature enough to to not damage the proceeding equipment. The tank of water will be connected to a separate...
  43. B

    How Do You Calculate the Flow Rate from a Rectangular Opening in a Tank?

    Homework Statement A rectangular opening is cut into the side of a large open-topped water tank. The opening has width W and height H2 - H1, where H1 is the distance from the top of the tank to the top of the opening, and H2 is the distance from the top of the tank to the bottom of the...
  44. S

    Imaginary free energy and decay rate

    In euclidean quantum field theory, the imaginary part of the free energy, defined as the logaritm of the partition function, is it connected to the decay rate?
  45. Y

    Rate law expression with solids and liquids

    Hello Forum! I was wondering: In the rate law expressions, I could never find an example with a solid or a liquid in the reactants in my textbook (Chemistry by Zumdahl). I searched Chemistry (Raymond Chang) and Principles of Molecular Chemistry, without any success. What happens to...
  46. karush

    MHB What is the rate of change, in radians p/s

    Point P moves at $a$ constant rate along the semicircle centered at O from M to N. The radius of the semicircle is $10cm$, and it takes $30s$ for $P$ to move from $M$ to $N$. $∠POM$ has measure $x$ radians, $∠OPM$ has measure $y$ radians, and $MP=S$ cm as indicated in the figure. $a.$ What is...
  47. G

    Can equilibrium rate constant has unit of [time^-1]?

    Hi all, I am having a homework problem that is statement really bothers me and I think it might be a typo. It goes in the following: Homework Statement A is a short life unstable state and it is in equilibrium with B and C. A\LeftrightarrowB A\LeftrightarrowC The equilibrium rate constants...
  48. R

    Probability Series System Failure Rate Question

    Homework Statement A circuit board has 20 integrated circuits(ic) with constant failure rate of 5 chips per million per hour (5FITs), 300 resistors(r) with a constant failure rate of 20 chips per million per 1000 hour (20 FIT), and 10 diodes(d) with a constant failure rate of 10 chips per...
  49. Runei

    Leakage Rate Units - Understanding the Basics

    Hello, At my work I'm working with testing the leakage rate of a gas system, and right now I am trying to gain some understanding of it all. However, there are some things which are very confusing to me, in regards to these rates. Searching the internet I find several different ways to...
  50. B

    Arrhenius equation and rate of change

    I wanted to see how the rate of change of rate constant with temperature (dk/dT) changes with activation energy. I tried to do this with differentials: k=A*e-EA/RT so \frac{dk}{dT} = \frac{A E_A \cdot e^{-\frac{E_A}{RT}} } {RT^2} and then \frac{d(\frac{dk}{dT})}{dE_A} = A \cdot...
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