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. H

    B Why is blood flow rate constant?

    I am having trouble understanding why blood flow rate is constant between the aorta and the sum of capillaries/sum of the arterioles. I keep thinking that in the arterioles or capillaries there is a decrease in velocity and somehow this decrease in velocity will decrease the total amount of...
  2. J

    Need help calculating fuel flow rate

    I am working on something that I could use some help with. I have a flow sheet for some fuel injectors that gives fuel quantity through the injector with a set pressure and activation time for 4 different points with different activation times and pressures. I need to come up with a formula to...
  3. iHaveQuestions88

    The Decay Rate of a Hypothetical Antimatter Container

    Hi All, First time poster here, and I've got a couple questions. Straight up, I'm writing a sci-fi story where antimatter is utilised as fuel (feel free to laugh at the cliche), and I want to portray it as realistically as possible. To that end, I've come up with a storage method and I want to...
  4. S

    I Mass Flow Rate Problem: Easy Unite Conversion Tricks

    Hi, I am not science student. Can anyone help me to solve this? Density and velocity of a fluid is given as 920kg/m3 and 5m/s, this fluid is flowing through an area of 25cm2. Calculate the mass flow rate? I am in search of some easy unite conversion tricks also.
  5. 8

    MHB ACT Problem: Distance, Rate and Time

    Joan is riding her bicycle along a track at 15 miles per hour. Anthony, who is ahead of Joan on the same track, is riding his bicycle at 12 miles per hour. If it will take Joan 5 hours to catch Anthony at their current speeds, how many mile ahead of Joan on the track is Anthony? How would you...
  6. R

    Why is vaporisation rate increased by a decrease in pressure

    In my textbook, it says that the rate of vaporisation can be increased by (a) increasing the temperature or (b) reducing the pressure. I understand why an increase in temp can lead to more molecules breaking away from the liquid and entering the vapor state. More temp = more energy = more...
  7. I

    Nuclear reactions, cross section, reaction rate

    Homework Statement A beam of ##^{50}##Ti nuclei impinged on a ##0.5 mg/cm^2## thick ##^{208}##Pb target in an experiment lasting 176 hours. During that time a total of ##3260 \; ^{257}##Rf nuclei were detected. The beam intensity was throughout the experiment constant at ##6.6\mu A##. Each...
  8. B

    Pressure and flow rate control valve, ....

    Dear all, I'm wondering how a control valve can control pressure and flow rate. I understand that a control valve in a pipe induces a certain pressure drop but I don't understand how this affects flow rate. I'm disturbed with the continuity laws which states that the total flow rate between two...
  9. M

    MHB What is the growth rate of a differentiable function?

    Hey! :o We have that the differentiable function $u(t)$ is stricly positiv for all $t\in [0,\infty)$ and that $w$ is the continuous growth rate of $u(t)$. I want to show that $$w_u(t)=\frac{d(\ln u(t))}{dt}$$How is the formula for the growth rate? Is it maybe given by...
  10. C

    Rate of Change of Vector in Rotating Frame

    I recognize the rate of change of a vector in an inertial frame S can be related to the rate of change of the vector in a rotating frame S0 by the equation below taken from my textbook, where Ω is the angular velocity vector. $$\Big(\frac{dQ}{dt}\Big)_{S_{0}}= \Big(\frac{dQ}{dt}\Big)_{S} +...
  11. B

    MHB What annual interest rate will the third party receive for the investment?

    A new University graduate wanted to live expensive life and therefore bought himself a new Mercedes Benz. But things got rough so he decides to sell the car to an automobile company. He accepted a 270-day note for 3,500 Euros at 10% simple rate interest as full payment amount and the interest to...
  12. mertcan

    I Rate from one state to another state in Markov

    Hi, initially I would like to express that if you look at the first question it asks the rate at which the production goes from up to down, and ıf there is a rate I think the result should include time unit, but when I look at the solution result only consists of numbers ( the multiplication of...
  13. F

    Convert Volumetric Flow Rate to Mass Flow Rate

    How to convert volumetric flow rate to mass flow rate?
  14. Nguyen Ngoc Anh

    I Reaction Rate: Calculations & Limitations

    Dear all, As we know, the reaction rate can be calculated as following: R = N * σ * Φ (1) Where R is reaction rate (events/s/cm3) σ is cross section (cm2) Φ is flux of incident particle beam (particles/s/cm2 N is density of target (atoms/cm3) Logically, there is a limitation of R, because...
  15. Minoui11

    Flowmetry Analysis (relating height to flow rate)

    Hello! 1. Homework Statement I need to find the instantaneous height of a liquid during the simultaneous filling and emptying (through a hole) of a cylinder. I have varying Qin at incremental time of 1 sec. with cylinder area=5 cm and orifice area=0.5 cm. Homework Equations Torricelli's...
  16. T

    MHB Continuous Compounding over 12 months (finding the rate)

    This problem is actually for a program I'm writing and I've forgotten my basic maths.I have an initial value starting at period 0 . That value is 20. At the end of 12 periods (period 12) I have a value of 33. So I know the last value is 33 and the first value is 20 and I want to find the...
  17. G

    Calculate Flue Gas Flow Rate for 5 Bar Steam Generation

    Homework Statement A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C4H8) by volume. It is to be fed to the combustion chamber in 10% excess air at 25°C, where it is completely burnt to carbon dioxide and water. The flue gases produced are to be used to generate 5...
  18. F

    Trivial Question - rate of heat loss from hot drink

    Hello people of PhysicsForum Apologies in advance if my prefix selection is inaccurate and for my absolute physics noobness. I know no physics jargon so I'm sure my question will be phrased in the same way a 10 year old might. So here is my silly, trivial question: First of all, remove all...
  19. M

    Derivation of rate of energy change from Lorentz force

    I am trying to derive from the Lorentz force equation the time derivative of the total energy. This involves using the equation for the jth electron in an electron beam traveling through an undulator. I have done it in such a way using the work done relation however I have been told that it is...
  20. wolram

    B Is the universe expanding at an accelerating rate

    http://www.ox.ac.uk/news/science-blog/universe-expanding-accelerating-rate-%E2%80%93-or-it Now, a team of scientists led by Professor Subir Sarkar of Oxford University's Department of Physics has cast doubt on this standard cosmological concept. Making use of a vastly increased data set – a...
  21. L

    G force and rate of deceleration

    gee i am not worthy of being here with you guys but i must know is an accelerometer's negative output due to the braking of a motor vehicle directly proportional to the the rate of deceleration of the motor vehicle and can this be predicted using a derivative function? And if I were to plot the...
  22. moenste

    Ratio of the rate of decay of R to that of S after 2 hours

    Homework Statement At a certain time, two radioactive sources R and S contain the same number of radioactive nuclei. The half-life is 2 hours for R and 1 hour for S. Calculate: (a) the ratio of the rate of decay of R to that of S at this time. (b) the ratio of the rate of decay of R to that of...
  23. T

    Jet Spread Rate K Values- Momentum diffusement

    The Problem Statement I have a jet entering leaving a nozzle at ui into an ambient fluid with ue = 0 I am trying to equate the rate of momentum diffusement (or spread) to the shear forces caused by ue -ui I understand that the rate momentum diffusement is are equated by empirical K- values...
  24. moenste

    Rate of change of current with time, galvanometer deflection

    Homework Statement (a) What is meant by the statement that a solenoid has an inductance of 2.0 H? A 2.0 H solenoid is connected in series with a resistor, so that the total resistance is 0.50 Ω, to a 2.0 V DC supply. Sketh the graph of current against time when the crrent is switched on. What...
  25. I

    Difference between rate and frequency?

    Is rate of collision and frequency of collision the same ? In what ways are they different ?
  26. A

    Calculation of water flow rate in heat exchanger

    I am not a mechanical engineer; but I have physics background. I want to lift about 250 watts of heat from a metal block. At the same time I have to maintain its temperature at 30 deg Cel. For this I want to use water-air heat exchanger (HE). Heat exchanger will have inlet & outlet pipes. Hot...
  27. V

    Estimated Instantaneous Rate Of Change

    Homework Statement You have to graph f(x) = x3 - 2x2 + x and find where the instantaneous rate of change is positive negative and zero. Homework EquationsThe Attempt at a Solution I factored this and found the zero's to be x= 0 and x = 1. With all this info given I graphed it and realized...
  28. R

    Soda bubble formation rate on plastic straw and glass cup

    I observed that if you pour soda into a glass cup and leave the straw inside, bubbles seem to form on the plastic cup at a much much quicker rate. Why is this? Why do bubbles form on the straw at all? Not sure if this should be in general physics or chemistry
  29. B

    How to find force from volumetric flow rate and pressure

    1. Homework Statement Hi. This is a problem related to designing a RC hover craft. We are given a datasheet for a fan used as thrust. http://imgur.com/6liZSid Sorry image post no working, url: http://imgur.com/a/6XLwL We have to approximate the equation to a straight line through the curve...
  30. J

    B What factors affect the rate of sinking objects in water?

    Hi All, I have a problem (with 3 separate instances) to which I believe I have the answers, but would like check with those more knowledgeable than myself. They revolve around 3 blocks sinking through water and which falls quicker. I am ignoring friction. Instance 1: All blocks are exactly the...
  31. A

    Heat energy and liquid nitrogen boil-off rate

    Homework Statement Kindly refer to part (c). The woking should be power/0.35 (what I think according to the graph). But the answer is power (that is the answer of part b) divided by 0.02 Homework Equations I have used the ratio method simply The Attempt at a Solution According to part (b)...
  32. A

    Mass Flow Rate of Pressure Regulator

    Hey, I have an air tank that is at a set pressure, say 3000psi, and I have attached a regulator to the end that regulates the pressure down to 800psi. As the valve on the tank is opened the pressure and the mass in the container will decrease. If there was no regulator the mass flow rate would...
  33. E

    Calculate Heat Transfer Rate for Copper Coil

    I’m working on an experiment and would appreciate some guidance to characterize the performance of it. I have a small homemade copper coil submerged in a 3 gallon water tank. I’m delivering hot water to the coil that in turn heats the water in the tank. I sense I’m looking for a rate of heat...
  34. onion3000

    Do mecanum wheels move foward and sideways at the same rate?

    Say you have a robot with mecanum wheels and move all the motors forward one rotation, and the robot moves forwards x cm. If you make the robot go sideways where each of the motors moves one rotation, does the robot move sideways x cm as well? Does it depend on the angle of the rollers on the...
  35. G

    Mass flow rate through a regulator

    Hi, We have a canister at a set pressure (4500psi) full of compressed air. A single stage pressure regulator is fitted to the canister that reduces the outlet pressure to 850psi. The flow from the regulator is then used in a divergent nozzle to create a thrust force capable of lifting a small...
  36. Clara Chung

    Rate of change problem (differentiation)

    Homework Statement Refer to the photo, please verify my answer Homework Equations calculus The Attempt at a Solution For c, can I do it by assuming Ah=V. A(dh/dt) + h(dA/dt) = dV/dt then find dA/dt?
  37. iceberk

    How to change desired flow rate of the nozzle

    Hello, We have a system with a 70 bar pump and 9 nozzles connected to the pump lines. Total flow rate is 2 l/m. Is there a way to change only one nozzle flow rate manually, with a pressure regulator valf just behind that nozzle? Thank you.
  38. G

    I Is time rate getting faster with cosmic expansion?

    Hi, layman here, but hopefully reasonably educated. I did not know whether this question might fit better under relativity or under cosmology so I'm posting it here. General Relativity tells us that time slows down in gravity wells. The cosmic expansion tells us that the energy density in space...
  39. ChloeYip

    River Flow Rate: Find Answer b in 1.5m/s at 28°

    Homework Statement You want to swim straight across a river that is 76 m wide. You find that you can do this if you swim at an angle of θ = 28° from the upstream direction at a constant rate of 1.5 m/s relative to the water. At what rate does the river flow? The angle θ is measured from the...
  40. jsg94

    Determine air flow rate from pressure drop and hose diameter

    Good evening everyone, I have a pressure meter from where we determined a pressure drop of 5.5 psi (Initial pressure 45.5 psi, final pressure 40 psi). The working fluid is air. The diameter of one of the hoses that is connected to the pressure meter is 1/4". I wasn't able to take a picture of...
  41. Twigg

    A Confusion about Derivation of Vacuum Rabi Rate

    Hi all, I am learning about the vacuum Rabi frequency for the first time in Metcalf's book Laser Cooling and Trapping (Section 2.2). I am trying to make sense of the following two equations Metcalf gives: $$\hbar \Omega_{S} = -\vec{\mu} \cdot \vec{E_{\omega}}$$ and $$\vec{E_{\omega}} =...
  42. F

    Determining the rate law from experimental data

    Homework Statement First question on PDF: http://ars-chemia.net/Classes/102/Problem_Sets/Practice%20Exam%20for%20Exam%201%20Key.pdf Homework Equations I used the initial rates method: Rate2/Rate1=k2*[A]^m/k1*[A]^m The Attempt at a Solution When I solve these types of problems with the...
  43. F

    Video Camera Connection to PC -- How to get the fastest frame rate transfer?

    Hello, What is the fastest connection method (i.e. type of cabling) to transfer images from a video camera to a computer, i.e. what type of connection gives the highest frame per minutes? Is a USB connection fast? If not, why not? Should I look at a camera that connects in a different way...
  44. nysnacc

    Rate of change and integrating factor

    Homework Statement Initially 5 grams of salt are dissolved in 20 liters of water. Brine with concentration of salt 2 grams of salt per lter is added at a rate of 3 liters per minute. The tank is mixed well and is drained at 3 liters a minute. How long does the process have to continue until...
  45. M

    Electrochemistry: rate constant dependence on CV peak

    Hi there, I am currently studying charge transfer reactions between metallic electrodes and redox couples in aqueous electrolytes (in a diffusion limited system), and I was wondering about the influence of the rate constant on the reduction/oxidation peak maximum. Typically, it is assumed that...
  46. Battlemage!

    I Lim f(x)/g(x) as x->∞ and relative growth rate of functions

    Everyone "knows" that \lim_{x\rightarrow ∞}\frac{2^x}{x^2} = ∞. We "know" this because 2x grows faster than x2. I use quotes because this is just what we're told in basic calculus classes. But what about a theorem for this? I've searched through google, looked through various university homework...
  47. B

    [Kinetics] Using Rate as a Conversion Factor

    Homework Statement Certain pollutants encourage the following decomposition of ozone: 2O 3(g) -> 3O 2(g), at a rate of 6.5 x 10-4 M O 3/s. How many molecules of O2 gas are formed in each litre of atmosphere every day by this process? (As this problem provides a rate in units of mol/L/s and...
  48. CivilSigma

    Derivative in mass flow rate equation - Hydrology

    Hello, I am working with the mass flow rate equation which is:$$\frac{d \dot{m}}{dt}=\dot{m}_{in}-\dot{m}_{out}$$ To determine the change of the height of water in a reservoir. Assuming m_in = 10 and m_out = sqrt(20h), then : $$\frac{d (\rho \cdot Q) }{dt}=\rho \cdot Q_{in} - \rho\cdot...
  49. R

    Flow rate of air in discharging reservoir

    If I have a tank of volume V, pressure P, and temperature T, what is the most effective way to determine the volume flow rate if I were to suddenly allow the air to discharge through a hose? My first thought was that I could use Boyle's Law to determine the compressed volume of air in the tank...
  50. A

    I What is physicial interpretation of deviatoric strain rate

    How these properties are related to velocity fluid. The https://postimg.org/image/674a6sw4t/ https://postimg.org/image/674a6sw4t/ figure shows an area of Earth's mantle where upwelling of hot semi-liquid mantle is occurring in middle and then two downwelling currents on two sides (forming...
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