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. N

    Thermodynamics. Find the Mass Flow Rate of the Air and the Exit Area

    Homework Statement Air expands through a turbine from 8 bar, 960 K to 1 bar, 450 K. The inlet velocity is small compared to the exit velocity of 90 m/s, The turbine operates at a steady state and develops a power output of 2500 kW. Heat transfer between the turbine and it's surroundings and...
  2. E

    Calculating Nyquist sampling rate and interval

    Homework Statement Determine the Nyquist sampling rate and the Nyquist sampling interval for this signal. sinc(2100\pit) Homework Equations N/A The Attempt at a Solution Ok I know that the Nyquist sampling rate is double or 2 times the bandwidth of a bandlimited signal. So I...
  3. A

    Does wrapping a beer in a wet paper towel increase the rate of cooling

    It is commonly said (based on a quick Google search) that wrapping your beer in a wet paper towel and placing it in the freezer will allow it to cool faster than placing it in the freezer without said paper towel. Newton's Law of Cooling suggests otherwise. The fact that water releases energy...
  4. N

    Neuroscience: poisson and gauss in neuron firing rate model

    Hello! I was reading a journal article on modeling the interaction between different neural networks and I am confused about the follwoing method (cited below). It is describing the spike rate output of a neuron based on oscillating firing rates of excitatory (E) and inhibitory (I) inputs...
  5. P

    Calculating Baud Rate for Analog Signaling

    We are using analog signaling to transmit our data. If we utilize 4 different phase shifts and 8 different amplitudes and the bit rate is 100 Kbits/s what is the baud rate of the channel? I was thinking that it is log_{2} (4 * 8)/100 =1/20 but i think it is wrong.
  6. W

    Relationship between dose rate and amount of radioactive particles

    Hi, This might be a silly question but I've been struggling to find this out. What is the relationship between dose rate and the amount of Cs-137 in an area? if I know the exposure dose of the area is 5mSv, how can I work out how much Cs-137 is in this area? Thanks
  7. N

    Find Mass Flow Rate and the Exit Flow Area

    Homework Statement Air enters aone-inlet, one-exit contreol volume at 6 bar, 500K and 30m/s through a flow area of 28cm3. At the exit the pressure is 3 bar, the temperature is 456.5 K and the velocity is 300 m/s. The air behaves as an ideal gas. For steady state operation determine a) the...
  8. F

    How to calculate pressure and flow rate of an air jet?

    Hello, I have a box with a hole directly connected to a blower inside. I can use the air sent by the blower to give a thrust to the box, in order to move it. I can say the the box is in a room, so open air around the box. The thrust should be 35 N and I have to calculate the pressure and the...
  9. W

    Latent Heat Transfer Rate in a Pipeline help please

    Hey guys, first post. I'm trying to determine to the rate at which liquids drop out of a gas pipeline. I've modeled the system in a chemical process program, but its only a steady state model. Anyways, here's some of what I can get out of that program: Heat of vaporization Total Heat Transfer...
  10. E

    How to Calculate Flow Rate from Head Loss in a 3 Pipe with Caustic Soda?

    I have head loss (25.95ft) and converted that to pressure (17.19psi). I am trying to find flow rate in 3" sch 80 pipe coming from railcar at 25psi. So outlet pressure is 7.813psi. The fluid is 50% Caustic soda.
  11. V

    Finding the Initial Rate of Gas Leakage from a Small Hole in a Cubic Container

    Homework Statement A cubic container with sidelength l has a small hole with cross sectional area a (a<<l). The gas has density ρ and pressure P. Find the initial rate of gas leakage given that the outside pressure is 0. Homework Equations The question mentions the formula p=ρc2/3 so...
  12. L

    What is the distance traveled in the nth second?

    Homework Statement A particle moves along the x-axis in such a way that its distance x cm from the origin after t t seconds is given by the formula x= 7t + 12t2. What distance does it travel in the nth second? Isn't it 7(n) + 12(n)2?
  13. L

    Calculating Displacement and Distance for Vertical Motion Problems

    Homework Statement A ball is thrown vertically upwards and its height after t s is s m where s= 25.2t - 4.9t2 Find the distance moved in the 3rd second 2. At the instant from which time is measured a particle is passing through O and traveling towards A along the straight line OA. It...
  14. J

    Am I correct in saying the mass of a pendulum bob affects its damping rate

    How does the mass of a pendulum bob affect the time taken for the oscillation of a pendulum to diminish? At first I instinctively thought that it would have no effect. However, thinking about the pendulum bob's momentum as it interacts with the air molecules, a higher massed pendulum should...
  15. P

    Expansion Rate at the Big Bang: Uncovering the Role of Dark Matter

    If dark matter is accelerating the expansion of the universe, then how fast did the universe start expanding at the point of the Big Bang ? The pre-Standard Candle model of the Big Bang held that the expansion rate had always been declining and by backward interpolation, must have been very...
  16. H

    Convert 1460 tons/hour to lb/sec: Solution

    An ore loader moves 1460 tons/h from a mine to the surface. Convert this rate to lb/s, using 1 ton = 2000 lb. Homework Equations No Idea, I've tried the converter but the results come out wrong.
  17. L

    MHB Converting to a tri-monthly interest rate

    If the APR is 3%, and I want to find the tri-monthly interest rate, is the correct way to find it: (0.03+1)^(4/12)-1 ?
  18. T

    Burnup Vs. Consumption Rate

    So, In Lamarsh, when he talks about the burnup , he's talking about the fission energy released per unit mass of fuel where as when he talks about consumption rate, he's talking about the amount of fissile matter consumed per unit energy produced?
  19. I

    Rate of energy release by Polonium-210

    In the mark scheme they have done P = (8×1013) × 5.3 ×106(1.6 × 10-19) = 67.8 W I don't understand why they have done this? How does Activity x Energy= Power ?
  20. A

    Rate of planets flowing into stars: Discussion

    I just posted a question to ask for help on the Calculus & Analysis section to determine how fast planets go into stars. I should give a little background, in addition to pointing you to my latest two short papers: http://arxiv.org/abs/1301.4229 and http://arxiv.org/abs/1211.1984 I have...
  21. S

    Calculate Rate of Disintegration of Projectile

    I was thinking about meteorioids and how upon their entry into the atmosphere the large amount of disintegration they experience so i wanted to try running through a calculation of something similar to see if i could i understand it better. I'm going to outline a general thought process I've...
  22. M

    Rate of Change Problem with Clock Hand Position

    Homework Statement "On a certain clock, the minute hand is 8 cm long and the hour hand is 6 cm long. How fast, in cm/min, is the distance between the tips of the hands changing at 9 am?" Homework Equations The Attempt at a Solution I should be able to transform this somewhat...
  23. JimiJams

    Does Flow Rate Remain Constant Throughout a System?

    Hi, yesterday my dad and I were debating whether flow rate stays constant throughout a system. I told him we learned this in physics and he refused to believe it. He's a plumber so he may have thought his reasoning was more justified than mine. He finally said, "I can disprove it now" and...
  24. J

    Flow rate of water dropping out of a pipe

    I need to figure out the best way to improve drainage of spring water flowing through my property. The water from my neighbour’s spring flows 10m through a pipe into a manhole on my side. The water level in this manhole is always 10-20 cm higher than the in and out pipes. The water then flows...
  25. Y

    Auto Insurance monthly interest rate. Having trouble

    [b]1. If you took out a $11,250 car loan at 3.840 % for 5 yrs (60 months), (a) what would be the monthly payment? (b) what is the difference between paying the $11,250 up front versus taking a loan out for it? [b]2. Interest formula: I= P r T [b]3. (a) I= (11,250)(.03840)(5)...
  26. P

    Mass flow rate using a pitot tube

    I am majorly stuck, we are doing a report in which we determine the flow rate using a venturi then compare values with the flow rate from a pitot tube. So basically we have recorded pressure values with a pitot tube, moving the tube 2mm from the centre of the venturi each time and re-recording...
  27. Mandelbroth

    [Chem] Reaction Rate (Differential Equations)

    I'm only in a high school class. I just made up this problem to see if I'm getting the right idea in the long run. That, and then there's the fact that differential equations are SO MUCH FUN! :biggrin: Homework Statement Molecular bromine (initial concentration: 0.49 M) and formic acid (initial...
  28. I

    Why is convection heat transfer rate independent of relative velocity?

    Convection heat transfer rate decided by Newton's cooling law doesn't have a relative velocity between the fluid and the solid surface term. But intuitively doesn't blowing faster on a hot surface make it cool quicker?
  29. A

    [Chem] Problem finding a source for reaction rate constant

    Homework Statement I had an assignment where I needed to calculate reaction rate constants at different temperatures. I was supposed to use ab initio method (meaning I should use Spartan software), molecular partition functions and Eyring equation. The reaction was: H+HD...
  30. Astrum

    Related Rate - Rate of The Change in Distance of Two Ships

    Homework Statement Ship A is 100 km west of ship B. Ship A is moving at 35 km/h (west), ship B is moving at 25 km/h (north). Find the rate of change of the distance between the two ships after 4 hours. Homework Equations The Attempt at a Solution the distance between the two ships is shown by...
  31. S

    Rate Of Change Of Current In An Inductor

    Homework Statement A coil has self inductance L of 2 Henrys, and a resistance R of 100 Ohms. A DC supply voltage E of 100 volts is applied to the coil. Show graphically the approximate rate at which the current increases at the moment of switching on (t=0) and after 10ms. Confirm your...
  32. O

    Heat rate flow through bar? and thermal conductivity

    Homework Statement A hot reservoir is maintained at a temperature of 78 oC, and a cold reservoir is maintained at a temperature of 5oC. They are separated by 11.00 cm, and are connected by a cylindrical bar made of two materials. The radius of the bar is 0.83 cm. The upper part of the bar is...
  33. W

    Rate of change of volume of a rectangular box

    Homework Statement How fast is the volume of a rectangular box changing when the length = 6 cm, width = 5 cm and depth = 4 cm and the length and height are increasing at a rate of 1 cm/s and width is decreasing at a rate of 2 cm/s. Homework Equations Volume of a rectangle = l*w*h The...
  34. H

    Radiation Dose Rate from 60Co γ-Ray Source

    Homework Statement Some people are standing at a distance of 3 m from an unshielded 60Co γ-ray source of activity 10^9 Bq. What radiation dose rate are they receiving? (Each disintegration of 60Co produces a β particle of 0.3 MeV maximum energy with a range 0.8 m in air, and two γ rays, one...
  35. M

    MATLAB Calculate Relative intensity noise using laser Rate equations matlab

    Hello Everybody, I'm trying to plot the frequency spectrum of RIN using Matlab. I've the following code function p=rateblock tau_s = 3e-9; N0 = 1e24; A =1e-12; P0 = 1/(A*tau_s); TSPAN = 0:1e-2:10.23;; Y0 =[0 0]; [T,Y] = ODE45(@rate_equation,TSPAN,Y0); subplot(2,1,1)...
  36. I

    What is the Accretion Rate of Earth?

    Homework Statement i) Estimate (in kg/yr) the rate of Earth accreting inter-planetary dust. Assume a particle number density of n=1e-8/m3, a particle mass density of 5 gm/cc, a particle radius 50 microns and a relative velocity equal to Earth's orbital velocity (so the dust particles are, on...
  37. M

    Calculate Relative intensity noise using Rate equations

    Hello Everybody, I'm trying to plot the frequency spectrum of RIN using Matlab. I've the following code function p=rateblock tau_s = 3e-9; N0 = 1e24; A =1e-12; P0 = 1/(A*tau_s); TSPAN = 0:1e-2:10.23;; Y0 =[0 0]; [T,Y] = ODE45(@rate_equation,TSPAN,Y0); subplot(2,1,1)...
  38. G

    What happens when you vary sigma in the s-plane?

    Hi all, I'm studying Laplace transform right now. And I am trying to understand the s variable in the s-plane. I found online that s = σ + jω where ω is the frequency and σ is the decay rate. Frequency is pretty easy to understand but I can't seem to find anywhere that explains what is the...
  39. V

    Calculate exponential growth when rate r is changing

    The formula f(t) = I(1 + r)t gives the value of something after it has grown for t years, at rate r, with an initial value I. What if the growth rate r is continuously increasing? What is the formula now? Does it relate somehow to xx?
  40. steves1080

    How to calculate the boil-off rate of LO2?

    Hi everybody, I am an entry-level engineer working on a launch pad and so far I have little experience with cryogenics. We have a 80,000 gallon capacity liquid oxygen tank on site, and it is generally filled to about 75% full, but varies depending on what is going on. What I am wondering is...
  41. P

    Diffusion rate through lipid bilayer

    Homework Statement I had a homework problem that asked "Which compound in each pair will diffuse with a higher rate through lipid bilayer? a) Asp or Glu; b) Thymidine or TMP; c) glucose or glucosamine" And i figured the compound that is most nonpolar will go through fastest. So I said...
  42. H

    Bernoulli's Principle with a Venturi Tube, find flow rate

    So that's the question and I'm stuck on Part b. I don't even know how to approach it. I know A1= 3A2 but I don't know A1 and I need V2 and I don't know V1 or A2. I'm just confused as to how to do this. Please help!
  43. S

    The Equation for Volumetric Flow Rate?

    I'm not sure how to clearly express my query, so I'll round up the gist of it. I understand that this is an entry level question. I was told that, in order to calculate Volume Flow Rate (VFR), I would use these equations: * Q = Velocity * Area [EQUATION 1] * Q = Volume / Time [EQUATION 2]...
  44. C

    Problem involving the human body and rate of heat transfer

    Homework Statement If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. At night in a dry climate, the temperature of the sky can drop to -40°C. If you are lying on the ground with thin clothing that provides little...
  45. I

    Calculating volume flow rate per unit width of a plate ( Fluid Mechanics )

    This is the question The flow of a fluid between two large flat parallel plates normal to the y direction is fully developed and steady. The plates are a distance 2h apart in the y direction and the velocity profile, assuming y=0 is at the midpoint between the plate is V(y) = V_0(1-(y/h)^2)...
  46. C

    Instantaneous Rate of Change Problem

    Homework Statement Find the instantaneous rate of change for the function y2+(xy+1)3=0 at (2,-1) Homework Equations N/A The Attempt at a Solution I tried getting it into a "y=" format but I don't really understand how to deal with the y when it's squared in one part and cubed in...
  47. F

    Calculating Velocity and Time for a Falling Coin

    Homework Statement s(t)= Vit + 1/2 a t^2 + So a) find the average velocity on the interval [1,3] b) find the instantaneous velocity when t= 3s. c) how long does it take the coin to hit the ground? d) find the velocity when the coin hits the ground Homework Equations a= -32ft/(s^2)...
  48. F

    Rate of change of the area of the rebgion

    Homework Statement A board 5 feet long slides down a wall. at the instant the bottom end is 4 feet from the wall, the other end is moving down the wall the rate of 2 feet per second.at that moment how fast is the area of the region between the board, the ground and the wall changing...
  49. Z

    Water drainage rate through soil.

    Hi, I'm designing the attached aquaponic system and am trying to estimate the speed at which water will drain through the pipes. Basically, water enters the top of the pipe, then drains through roughly 5 feet of soil before it exits the pipe. Is there a way to estimate the speed at which the...
  50. F

    What are the Steps for Calculating Velocity in a Coin Drop Problem?

    Homework Statement A coin is dropped from a height of 800 feet. The height, s(measured in feet), at time, t(measured in seconds is given by: s(t)= Vit + 1/2 a t^2 + So a) find the average velocity on the interval [1,3] b) find the instantaneous velocity when t= 3s. c) how long does it...
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