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. C

    Effects of frequency on rate of emission of photoelectrons

    Light of constant intensity is incident on a metal surface, causing electrons to be emitted. State and explain why the rate of emission of electrons changes as the frequency of the incident light is increased. My answer: As frequency increases, energy of photons also increases, so more energy...
  2. T

    Minimum capacity rate ratio of a heat exchanger

    Homework Statement Here is the question: I am confused about the solution. In the solution they found that the minimum capacity rate ratio R = C_min/C_max was zero. This is because of the term I circled in the red which I do not understand why it goes towards infinity. Here is the solution...
  3. A

    Find the integral rate equation of 1st order reaction

    Homework Statement The reaction v1A+v2B--->Products is 1st order wrt A and 0 order wrt B.If the reaction is started with [A0] and [B0] find the integral rate equation. The Attempt at a Solution I have got ln[A0]/[A0]-v1x=kt but answer is given as ln[A0]/[A0]-v1x=v1kt.Which one is right?
  4. C

    Does covering half of a hose affect the flow rate of water from an open tank?

    Let's say that you have an open tank of water and a hose connected to the bottom of it. Water is flowing out of the hose. You then cover half of the hose with your thumb. Will the flow rate (liters/second) right before you cover the hole be the same, less, or greater than right after you cover...
  5. J

    Rate of change of x wrt sin(x)

    Is possible to compute the rate of change of x wrt sin(x)? ##\frac{dx}{d \sin(x)}##
  6. Ken G

    What sets the fusion rate in a main-sequence star?

    A few years back I started a thread to make the point that there is a common misconception about main-sequence stars that their fusion rate sets their luminosity, in the sense that to know what the luminosity of the star will be, you need to know what the fusion rate is. In particular, you...
  7. K

    Marxian economics: Differentiating the Rate of Profit Equation

    Marxian economics: Differentiating the "Rate of Profit Equation" While watching a recent Youtube video on Marxian crisis theory and the Tendency Of The Rate Of Profit To Fall, I decided to apply calculus to the equations to see what I got. The rate of profit is defined as ∏ = S / (C...
  8. M

    Reaction rate for multiple steps

    Just a curious question. How would the rate for a net reaction involving multiple steps of all similar (perhaps exact - i know it's highly unlikely) activation energies be calculated? I've been told to just look at the slowest step (highest EA) in all cases, even if they are similar in...
  9. C

    Probability of counts from the counting rate of a radioactive sample?

    Homework Statement The average counting rate of a radioactive sample is 486 cpm (counts per minute). Find the probability that in any given 10s interval one gets less than 72 counts. Is this the same as the probability of getting less than 72 X 6 = 432 counts in 60s? Homework Equations...
  10. E

    Calculating rate of change of momentum for a package

    A helicopter is flying to the right (in the +x direction) with a constant speed v, carrying a package of mass M suspended below it using a cable as shown in the figure (you can assume that H and L are not changing with time). Choose the package as your system. What is its rate of change of...
  11. C

    Why does more bandwidth means higher bit rate in digital transmission?

    I'll start with what I do know: Shannon Law gives the theoretical upper limit C_{noisy}=B*log_{2}(1+\frac{S}{N}) if S = N, then C = B As N→∞, C→0 As N→0, C→∞ Nyquist Formula says approximately how many levels are needed to achieve this limit C_{noiseless}=2*B*log_{2}M (If you do not use enough...
  12. L

    MHB Rate of Change of Airplanes in 3D

    One plane is flying due east straight and level at 30000 feet and at 420 mi/h. A second plane flies due north at 40560 feet and at 480 mi/h. The second plane crosses above the flight path of the first plane 2 minutes after the first plane passes that point. How fast were they approaching each...
  13. U

    Interest Rates Rise: Explaining the Economics Behind Output Volume

    Why an increase in the volume of output cause interest rate to rise? Any one can explain thoroughly?
  14. L

    Solving Digitoxin Rate of Elimination with Geometric Progression

    Homework Statement Patients with certain heart problems are often treated with digitoxin, a derivative of the digitalis plant. The rate at which a person's body eliminates digitoxin is proportional to the amount present. In 1 day, about 10% of any given amount of the drug will be eliminated...
  15. Entanglement

    Rate of reaction and coefficient of the reactan

    Suppose in the reaction 2 NO + O2 --------> 2NO2 Why when the the concentration of NO is doubled, the rate increases 4 times, I know that the rate is directly proportional to the square of NO concentration (I don't know why) and it's order of reaction is 2 ( I don't why ). but I still can't...
  16. P

    Rate constant and Kinetic model

    Hi everyone, I have a question on the rate constant of a kinetic model(like the one we use in describing chemical reaction). Suppose we have the following model between two states A and B: A--(a)-->B A<--(b)--B where a, b are the rate constant for the transition. So the corresponding...
  17. A

    Going from a rate to a probability

    I am simulating a system where I have as a function of time the rate at which something happens, like for instance n atoms per second passes a boundary. Now what happens in the system is that as soon as one atom passes the boundary, everything goes back to initial values. So my problem is that I...
  18. E

    Calculating Heat Transfer Rate from a Smoky Layer to a Compartment Floor"

    Homework Statement The underside of a smoky layer 7m x 10m is radiating like a flat, isotropic plate at 440°C to the floor of a compartment 1.85m below. The mean emissivity is 0.45 and the floor is homogenous/flat plate at 40°C. What is the rate of heat transfer from the smoky layer to the...
  19. gfd43tg

    Vent line pressure and mass flow rate

    Homework Statement 1. An emergency vent line from a reactor is 55 feet long and has an inside diameter of 4.026 inches. The surface roughness of the pipe is 0.0012 inches. The line discharges hydrogen to the atmosphere (P = 14.7 psia) a) If the mass flow rate of hydrogen is 95 lb / minute...
  20. A

    Rate of reactions with eggs boiling

    At a high altitude camp in the Rockies, water boils at 95.4°C instead of 100.0°C. A visitor has requested a soft-boiled egg (usually boiled for 3.00 minutes at 100.0°C). The activation energy for the reaction in question is 453 kJ/mol. 6 marks egg protein (l) egg protein (s) How long will it...
  21. G

    Rate of change of area of circle in respect to radius

    What is the Rate of change of area of circle in respect to radius when radius is 3in I know that that dA/dr is equal to the circumference of the circle But where does that come from? Also the formula for the circumference of the circle is 2(pi)r But the answer is 6 (pi)in^2/in. I understand...
  22. A

    Calculating average inflation rate per year

    Homework Statement An economist has predicted that for the next 5 years, annual inflation will be 8%, and then there will be 5 years at a 6% inflation rate. This is equivalent to what average price change per year for the entire 10-year period? Homework Equations The Attempt at a Solution...
  23. M

    Gas Flow Rate Calculation using Pressure Drop

    Homework Statement Hi everyone, I'm trying to calculate the flow rate of air in straight tubing that is 30cm long and has a diameter of .1875 in and has an outlet into a 100 mL vial which is vented to the atmosphere. The starting of the system pressure is 20 psi and the ending psi is 14.6...
  24. G

    Why transition rate independent of time in perturbation theory?

    After time t, the probability of monochromatic absorption of the ground state |1> to the energy state |n> is given by: |<n|1>|^2=4|U_{n1}|^2\frac{\sin^2((E_n-E_1-\hbar\omega)t/2\hbar)}{(E_n-E_1-\hbar\omega)^2} where U is the transition matrix. The claim is that as t goes to infinity, the...
  25. A

    Liquid Collision Rate: Estimating Molecular Flux

    In kinetic theory a liquid is viewed as an incompressible substance in which the atoms are free to move. I would like to know how to find an expression for the molecular flux in a liquid. By molecular flux I mean the collisions per unit area, where collision refers not to the collision between...
  26. O

    Data Rate Formula: Finding the Right Solution

    I am trying to come up with a good data-rate formula for a system. The system sends out 'x' symbols per transaction. The transactions take place sequentially, but there is a delay 'z' between them. 'z' is variable and can even be pseudo-random. Also each transaction takes a time as well, but...
  27. E

    Differential Equations Rate At Which Chemical Amount Changes

    Homework Statement Suppose that a large mixing tank initially holds 300 gallons of water in which 50 pounds of salt have been dissolved. Pure water is pumped into the tank at a rate of 3 gal/min, and when the solution is well stirred, it is then pumped out at the same rate. Determine...
  28. A

    Help with measure air flow rate with pressure difference in a cylinder

    Hi, I've got a horizontally moving piston in a pneumatic cylinder, the piston is moving backward to suck the air into the cylinder from a hole at one end, this will lead to an air flow rate. I would like to measure the air flow rate at that instant. I was thinking of with a pressure sensor...
  29. G

    Rate Constant Problem: Find n & Rate Constant

    http://imgur.com/IgOdMW3 Question in the link. How do I go from here and get the rate constant and n values?
  30. R

    Substance or chemical reaction, that is highest rate in changing mass

    Hello! What would be the substance, chemical reaction and technique, to have the highest rate of immediate mass change, back and forth, from low to high and back to low again, as many times as needed - using only homemade DIY, non dangerous materials and equipment? My intentions are to...
  31. B

    Rate of forward motion from rolling rectangle vs degrees turned

    Homework Statement I'm looking for a formula that relates the distance traveled by a 'rolling' rectangle compared to a given amount of degrees it has turned. And while I have you, another problem I have with the rolling rectangle is that its center point would move up and then down with...
  32. T

    Rate of Ammonia Prod. in N2+3H2 Reaction

    Homework Statement This is not a homework question, rather, I am just trying to clarify a concept and example in my textbook. Ammonia is produced by the reaction of Nitrogen (N2) with hydrogen (H2) as shown in this equation. N2 + 3 H2 --> 2 NH3 The rate of ammonia production is 5.0 x 10-6...
  33. Q

    How do you calculate the mass flow rate, volume flow rate and velocity

    How do you calculate the mass flow rate, volume flow rate and velocity of a 6 bar compressed air supply through a 2mm tube? This is all the information I have been given. Is there any theory that could help me here? I can't seem to find much on the internet, so I have no clue where to begin...
  34. T

    Logistic models and the intrinsic growth rate

    In models of exponential growth, we have an intrinsic growth rate (r) that is calculated as the difference of birth rates to death rates. With the logistic growth model, we also have an intrinsic growth rate (r). How then do birth rates and death rates relate to the intrinsic growth rate in...
  35. M

    Calculating Gas Stream Flow Rate from Condenser

    Homework Statement A gas stream contains 18.0 mole % hexane and the remainder nitrogen. The stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied. The hexane mole fraction in the gas stream leaving the condenser is 0.05. Liquid hexane condensate is...
  36. D

    Transmission coefficient in reaction rate theory

    This question relates to rate constants of transition events. The transmission coefficient κ reduces the value of the rate constant compared to the transition state theory (TST) value. I understand κ to be defined as the probability that a reaction coordinate q will proceed to product given that...
  37. B

    Stimulus / rate reconstruction with Wiener Kernels.

    Hello. I am having some trouble trying to reconstruct my firing rates using a Volterra expansion. Basically it is known that , if : s(t) = the value of a given stimulus at time t r(t) = the firing rate of a neuron at time t then we assume that a possible estimate of the firing rate can...
  38. adjacent

    Maximizing Torrent Download Speed: Tips for Computer Geniuses

    For all the Computer Geniuses, I am trying to download some torrent file.And the download rate is just 6kbps,Seeders are 500 something and leechers are 162. This Sucks However,Sometime ago with another torrent,I reached 60kbps with less than 100 seeders. :))) Do you know any tricks to make...
  39. L

    Finding equation for rate of change of distance of spiraling electron

    Homework Statement (This problem concerns an electron orbiting a proton. Ultimately we are trying to find the time for a classical electron to spiral into the nucleus of an atom, which will lead us to a discussion of why classical mechanics gives way to quantum mechanics when discussing things...
  40. P

    Rate of Heat Transfer for a Two-Layer System

    Homework Statement Homework Equations (unsure) The Attempt at a Solution Homework Statement Homework Equations The Attempt at a Solution
  41. facenian

    Is the Linear Eulerian Deformation Tensor an Exact Measure of Deformation?

    Hello, I have difficulty interpreting the following fact (I'm reading Cotinuum Mechanics by Spencer). The relative velocity between two nearby points P and Q in the current configuarion is given by: dv_i=D_{ik}dx_k + W_{ik}dx_k where D_{ik}=\frac{d}{dt}e_{ik} is the rate of deformation tensor...
  42. M

    Solve Evaporation Rate Questions: Pressure, Volume & More

    i have question.. i need some to help me to solve it.. the Fact said that " when we reduce the pressure exerted on free water surface, the evaporation rate decrease"so i am searching for formula that related between the evaporation rate and pressure and volume
  43. U

    Need help with fast neutron absorbed dose rate

    Hello everyone. I need a hint of how to do the following question. I spent long time trying to solve and I could not do it. An ionization chamber that will be used to measure fast neutron absorbed dose rate consists of ethylene (C2H4) gas at a density of (1.2×10^-4 g/cm^3) enclosed by...
  44. MarkFL

    MHB John's Question: Air Pollution Rate of Change w/Distance

    Here is the question: I have posted a link there to this thread so the OP may view my work.
  45. karush

    MHB *2.8 Related rate from one cone to another cone

    A solution is draining through a conical filter into an identical conical container (both are $h=12$ and $r=4$ at top of cone) The solution drips from the upper filter into the lower container at a rate of $\displaystyle\frac{\pi\ cm^3}{\text{ sec}}$ and $\displaystyle...
  46. M

    Water jacketed reactor flow rate

    1. Homework Statement [/b] (135) 1. Liquid hydrazine (N2H4) is injected into a jet combustion chamber at 400 K and burned with 100 % excess air that enters at 700 K. The combustion chamber is jacketed with water. The combustion products leave the jet exhaust at 900 K. In the test, 50 kmol of...
  47. P

    Question regarding flow rate?

    Homework Statement Water from a faucet flows into a glass on a balance. The balance reacts quickly and the reading is increasing steadily. If the water flow is stopped suddently, how will the balance reading change compared to a reading just before the stop? Will the balance reading increase...
  48. S

    UART vs SSI:10Mbps Baud Rate Comparison

    Consider both UART and SSI transmission of data at a Baud rate of 10Mbps. Are they at equal speeds as an entirety, or is one faster than the other? I understand that the Baud rate is the rate of transmission, however, once the bits have been transmitted they undergo further steps to be processed...
  49. S

    Calculating rate constant from a set of data?

    Homework Statement For a reaction, A + H2O --> B + C We're given that d[A]/dt = k[A]n[H3O+]m And also a table of [A] vs time at T1 and pH 1, pH 2; as well as [A] vs time at T2 and the same pH 1 and 2. From this data, we're to find pseudo-n-order rate constants, and then n itself. Next...
  50. B

    MHB Confirm Interest Rate Solution on Total Loan

    A small firm borrows \$1000 from a stockholder at a sim-pleinterest rate of 7.5%. The company secretary lends the firm an additional sum at a simple interest rate of 8.25%. At the end of one year, the firm repays a total of \$3997.75. How much did the secretary lend the firm and what is the...
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