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. J

    Automotive Can the mass flow rate change?

    Hello everyone, Can the mass flow rate of air by a propeller connected to an engine through a small tube change if the rpm of the propeller is increased?
  2. opus

    Solution check for a Rate problem

    Homework Statement A vertical container with base area measuring 14.0 cm by 17.0 cm is being filled with identical pieces of candy, each with a volume of 50.0##mm^3## and a mass of 0.0200 g. Assume that the volume of the empty spaces between the candies is negligible. If the height of the...
  3. A

    MHB Calculating New Emission Rate of Radioactive Source

    A radioactive source emits particles at an average rate of 1 pe second. Assume that the number of emissions follows a Poisson distribution. The emission rate changes such that the probability of 0 or 1 emission in 4 seconds becomes 0.8. What is the new rate? Thanks.
  4. J

    Which mechanism and which step would best fit the data?

    Homework Statement Two mechanisms are proposed (as seen in the screenshot). Which mechanism and which step as the rate determining step would best fit the data? Homework Equations I think this is more of a conceptual problem ... The Attempt at a Solution I apologise for not strictly...
  5. Specter

    Instantaneous rate of change and deriving a fraction

    Homework Statement Sorry for so many posts lately, hopefully this is allowed. What tangent points on ##g(x)=\frac {12} {x+1}## has an instantaneous rate of change of -3? Homework EquationsThe Attempt at a Solution [/B] I know that once I derive ##g(x)=\frac {12} {x+1}## I can set the...
  6. Peeter

    Calculating the decay rate for h -> phi phi process

    Homework Statement Given a coupling h \; \partial_\mu \phi^a \partial^\mu \phi^a , meant to model the first order interaction of the Higgs field h to boson fields \phi^a , compute the width \Gamma(h \rightarrow \phi^3 \phi^3) of the Higgs particle to decay to two longitudinal (say)...
  7. S

    A Physical significance of growth rate in plasma

    Let us say that we have a dispersion relation curve and associated instability curve as shown below for a magnetised plasma, which have been formulated through kinetic theory. The frequencies and growth rate have been normalized w.r.t. cyclotron frequency of proton. My question is: what does...
  8. L

    Quick Question: Rate of Change of a Rotating Vector

    Is the equation presented (that the time-derivative of a given vector in such a scenario is equal to its angular frequency vector cross the vector itself) true in the case of a vector whose origin is not on the axis of rotation? The way I'm visualizing this, if we take such a displaced origin...
  9. DracoMalfoy

    Rate of Energy Transferred, Aluminum Pot

    Homework Statement The bottom of a circular, aluminum pot has a radius of 8cm and a thickness of 1cm. The temperature of the stove top is 120 degrees celsius and the temperature of the pot initially is 20 degrees celsius. What is the rate at which energy is transferred through the bottom of the...
  10. J

    A typical monthly utility rate / Current and resistance

    Homework Statement A typical monthly utility rate structure might go something like this: $1.60 for the first 16 kWh, 7.05 cents/kWh for the next 34 kWh used, 5.02 cents/kWh for the next 50 kWh, 3.25 cents/kWh for the next 100 kWh, 2.95 cents/kWh for the next 200 kWh, 2.35 cents/kWh for all in...
  11. physicschick21

    Accretion rate onto a WD over time (relation)

    Hi all, I was wondering if there is a correlation between the accretion rate and time. I think it should decrease as time increases, but I can't find the right correlation
  12. bornofflame

    RC circuit - Rate o'energy dissipated = rate o'energy stored

    Homework Statement 1. A 2.01 uFcapacitor that is initially uncharged is connected in series with a 6.51 kΩ resistor and an emf source with 74.6 V and negligible internal resistance. The circuit is completed at t = 0. b) At what value of t is the rate at which electrical energy is being...
  13. bornofflame

    RC Circuit - Rate energy is dissipated in the resistor

    Homework Statement 1. A 2.01 uFcapacitor that is initially uncharged is connected in series with a 6.51 kΩ resistor and an emf source with 74.6 V and negligible internal resistance. The circuit is completed at t = 0. a) Just after the circuit is completed, what is the rate at which electrical...
  14. kolleamm

    How to spin a gear at a slower rate without a bigger gear?

    I have a linear wire that moves let's say a distance of 1 inch. I would like this wire to spin a small gear (0.25 in circumference) 90 degrees for every 1 inch it moves. How can I accomplish this without using a bigger gear? Any ideas are appreciated. Thanks in advance
  15. R

    MHB Success Rate of College Grads: Probability of 1+ Job in 1 Year

    A study conducted at a certain college shows that 55% of the school's graduates find a job in their chosen field within a year after graduation. Find the probability that among 7 randomly selected graduates, at least one finds a job in his or her chosen field within a year of graduating
  16. Arslan Siddique

    Calculation of Velocity and Shear rate in rectangular channel

    Hi everyone, I would like to know the formula for calculation of velocity and shear rate in my rectangular fluid channel. Here are the important values regarding my rectangular channel. W= 2.5 mm, H=3 mm, L=35 mm. Fluid: Diluted Bacterial suspension derived from wastewater. Flow rate: 0.125...
  17. J

    Pressure and heights of a manometer -- Find the fluid flow rate

    Homework Statement Find the flow rate of water. The fluid in the manometer is mercury. ##d_{1},d_{2}## are the diameters in the figure Homework Equations Bernoulli, continuity equations The Attempt at a Solution We know that ##p_{1}=p_{1Top}+\rho_{water}gh_{2}##...
  18. YMMMA

    Circular motion/ speed increases at a constant rate

    Homework Statement If an object moves in a circular path with a speed that increases at a constant rate, which of the following can be concluded? (A) The radial component of the force acting on the object is zero. (B) The net force acting on the object is zero. (C) The net force acting on...
  19. R

    Hydraulic head as a function of flow rate

    Hello! 1. Homework Statement Symbols and variables: ##\dot{V}## : flow rate ##H## : Hydraulic head ##g = 9.81 \frac{N}{kg}## ##P_{atmosphere} = 101325Pa## ##\rho = 1000\frac{kg}{m^3}## I am given a piping system, with serie and parallel pipes, they start from one point and go back into one...
  20. O

    MHB Calculus I - Relative Growth Rate help

    Here is a picture of the problem: I am firmly stuck on part b). I know that relative growth rate is defined at f'(x)/f(x), but I cannot seem to come up with the right answer. I've tried everything I could conceivably think of. I do not understand why my answer is incorrect, unless I'm...
  21. opus

    Rate of Change of Angle for 90 ft Wire Attachment

    Homework Statement A pole stands 75 feet tall. An angle θ is formed when wires of various lengths of ##x## feet are attached from the ground to the top of the pole. Find the rate of change of the angle ##\frac{dθ}{dx}## when a wire of length 90 ft is attached. Homework EquationsThe Attempt at...
  22. B

    MHB Given amount and interest rate, find principal

    Homework help please: If I want to have $60,000 in 8 years, how much would I need to deposit in the bank today if the account pays an interest rate of 9%?
  23. K

    Calculating Muon Decay Rate using Delta Function Identity

    Homework Statement I need to calculate the muon decay rate, ignoring the mass of the outgoing particles. Homework Equations ##d\Gamma = \frac{1}{2E_1}|M|^2d\Pi_{LIPS}## The Attempt at a Solution I am actually having problem with the math at a point. I reached this...
  24. K

    PressureDrop/Pressure/Volumetric flow rate calculation (in a Pipe)

    Hello, If I have the following known variables: - P1, Pressure of fluid entering the pipe = 50 psi - L, Length of pipe = 10 in - D, Diameter of pipe = 0.5 in I want to learn how to calculate: - P2, Pressure of fluid at the end of pipe. - Q1, Volumetric flow rate of fluid entering pipe. - Q2...
  25. A

    Fuel cell mass flow rate magnitudes

    Hello, Can you tell me please the mass flow rate of hydrogen and oxygen per unit of area of electrodes in fuel cells? Or if you have information on the mass flow rate of hydrogen and air per volume of fuel cell stack? I understand this may vary, but I am looking for publications or other...
  26. H

    Affect of volume on the rate of diffusion?

    Homework Statement Hi guys. So for my biology class, we were doing a water chemistry experiment. We placed potato cells into beakers of different [sucrose] (dissolved in water). The goal was to plot the change in mass % on a graph, make a linear trendline, and see which solution was isotonic...
  27. P

    Deriving the Equation for Average Water Mass Flow Rate in Water Rocket Launches

    Hey, I'm a student who has to complete a written assignment for physics. I chose to launch water rockets and investigate the effect of volume on the range. I am trying to also come up with a mathematical model however I am struggling to understand an equation I found the following equation to...
  28. G

    Rate of Air Loss Through a Hole in a Spaceship

    Homework Statement We want to calculate the rate of air loss from a space vehicle (module) if a meteoroid punches a hole in it. Assume the module is sealed off from other modules. It is shaped like a cylinder roughly 4 m in diameter and 10 m long. The hole's area is a cm2. The hole is punched...
  29. S

    Rate of Reaction: N2 + 3H2 -> 2NH3

    Homework Statement Suppose there is a chemical reaction : N2 + 3H2 = 2NH3 The following things are written in my book : rate of disappearance of H2 = - Δ / Δt rate of reaction wrt H2 = - 1/3 * Δ / Δt My question is that why can't we write rate of reaction = rate of disappearance of H2 ? In...
  30. M

    Pressure drop necessary to have desired gas flow rate

    Hello, I'm a chemist and I'm currently working on my PhD on materials science. I'm trying to determine the pressure difference necessary to achieve the desired gas flow inside a chamber. The scheme of the chamber is the following: I have a big chamber which is evacuated to 0.2 bar, and another...
  31. Roy S Ramirez

    Relationship between volumetric flow rate and pressure

    Hello everybody, This is my first post. I've been working on a liquid rocket engine for a while, but I have never gotten to work on its feed system (fluid mechanics), until recently. We are using a very simple pressure fed system, and its main goal is to deliver the propellants at a specific...
  32. S

    Help with calulating a cyclic rate

    Hello, sorry if i do not ask the question correctly but any help would be great. i need to find the speed of an item and I'm not sure what i need to find this out? well a cyclic rate of this item? Thanks
  33. isukatphysics69

    Find the rate that the distance between two projectiles is changing

    Homework Statement The parameteric equations for the paths of two projectiles are given below. At what rate is the distance between the two objects changing at t = pi/2? Homework Equations x1=12cos(2t) y1 = 6sin(2t) x2=6cos(t) y2 = 7sin(t) The Attempt at a Solution I am completely...
  34. J

    Heat Flow Rate: Dependence on Conductivity & Temp Diff

    I recently read in a Khan Academy article that the rate of energy exchange through heat across a material of thickness ##d##, surface area ##A##, and thermal conductivity ##k## can be approximated by $$\dot{Q} = \frac{kA\Delta T}{d}$$ where ##\dot{Q}## is the heat rate and ##\Delta T## the...
  35. V

    Flow Rate of Liquid O2 Cylinder w/ 24 Bar Pressure

    Hi. Just looking for an average answer to a practical scenario. At work we use a liquid O2 cylinder which includes an outer jacket that houses a regulated gas pressure of 24 bar. I need to calculate the flow rate in l/min when the supply tap (15mm diameter) is open fully? This is essentially...
  36. I

    MHB How to use the RATE function in Excel ?

    Hello :) I was given this task: A quarterly deposit is €700 in 4.5 years, and the accumulated value is €13,600. What is the value of annual interest rate? And I would apply this formula: S = [((1+i)n - 1) / i] ∙ R €13,600 = [((1+i)18 - 1) / i] ∙ €700 To find out the annual interest rate...
  37. Z

    Flow rate calculation of hydrogen gas in case of leak

    Hi. I'm a mechanical engineer, but working as Safety Engineer. I have a question how to calculate the flow rate of hydrogen gas before a flow controller in case of leak through a 4.5 mm line at 35 bar pressure. Thanks in advance.
  38. D

    MHB Staff reduction rate from annualized to monthly rates

    Hi, If I have 100 staff at the beginning of the financial year and is ordered to reduce the workforce by 12%, ie I should have 88 on average at the end of the year. How would I calculate the monthly percentage so the reduction of staff can be rolled out gradually. I don't want to cut 12 in the...
  39. J

    I Is the Arctan Convergence Rate Claim Valid for Positive Values of a, b, and x?

    What do you think about the claim that \frac{x}{\frac{1}{a} + \frac{x}{b}} \;<\; \frac{2b}{\pi}\arctan\Big(\frac{\pi a}{2b}x\Big),\quad\quad\forall\; a,b,x>0 First I thought that if this is incorrect, then it would be a simple thing to find a numerical point that proves it, and also that if...
  40. L

    A Calculating the spontaneous emission rate for a material

    Hi, Suppose I have a 1D material of length L, and I want to calculate the spontanious emission rate Γ at ressonance frequeny. From my understanding, when light passes in a material at ressonance frequency it gets absorved by an electron in the atom, and after a spontaneous emission time tspont...
  41. J

    Engineering Rate of change of current in an R-L Circuit

    Homework Statement Homework Equations Current cannot change suddenly through inductor unless input is impulse voltage source. The Attempt at a Solution since input is DC source we have i(0+) = i(0-) so we have di/dt at t = 0+ is 0. Is it correct? Book has mentioned answer as B which is weird...
  42. A

    Effects of Temperature on Flow Rate

    Using a pump we are cycling water through a capsule with filter media inside; while measuring the flow rate (l/min) and the pressure (psi) going in and the pressure going out. The water is cycled back into the same storage tank. As the flow rate increases the differential pressure should change...
  43. H

    Rate of pressure increase of contained air being heated

    Wondering if I have a sealed steel tank filled with air and the air temp is 0C and the air pressure in the tank is 0, then heat is applied to the tank - what will the pressure be 100C? At 200C? At 300C? I assume the rate of expansion is constant, but correct me if this is wrong. Thanks.
  44. caters

    MHB What is the maximum death rate I should allow?

    With 44000 people on a generation ship for genetic diversity reasons, it is inevitable that some will be ill. However, if I were to go through a list of every infectious illness and decide whether or not it is allowed, should I have a death rate limit? Is there a point at which pregnancy rate...
  45. J

    Why is the bandwidth in PCM half of the transmission rate?

    When we use pulse code modulation , it is said that the min bandwidth requirement is half the transmission rate. Transmission rate given in Bits/sec. But why?
  46. Orangeator

    B Theoretical Question On The Twins Paradox and Heart Rate

    Okay, so if two identical twins put on a heart rate monitor that after let's say 400 million beats were detected (at 80bpm that's about 10 years) the monitor killed them. Now one gets in a spaceship and the other stays on earth. The one in the spaceship travels at say 95% of the speed of light...
  47. Ekaekto

    Shear rate in rectangular "channel"

    Hi everyone, Non-physics student here, and slightly in over my head :D I am slightly stumped for ideas regarding the calculation of the shear rate in a rectangular type channel, which I need to effectively simulate a blood flow type condition in a channel that has to be rectangular due to the...
  48. C

    How to calculate Fuel Mass Flow Rate

    I'm having a brain storm, If I have an 8 cylinder 4 stroke engine running at 4000 rpm over a 10 minute test and it consumes 4.4 Kg of fuel, then is the fuel mass flow rate as simple as the 4.4 Kg divided by the time to give me an answer on Kg/sec ? Thanks,
  49. L

    B Given a success rate of 1% and 100 tries....

    What is the probability of no success? 1 success? 2 successes? No success: 0.99^100 = 36.6% chance? 1 success: (0.99^99) + 0.01 = 37.97% chance? or (0.99^99) * (0.01)^1 = 0.369% chance ? You would think it would be fairly likely 2 successes: ? -Depends on formula for 1 success Can...
  50. T

    Heat Transfer & Combustion: Estimate Pipe Heat Loss/m

    << Mentor Note -- poster reminded to use the standard Template >> Question Three A pipe of outside diameter 200 mm is lagged with an insulating material of thermal conductivity 0.06 W m-1 K-1 and thickness 75 mm. The pipe carries a process fluid at a temperature of 300 °C and the average...
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