Rate Definition and 1000 Threads

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

Homework Statement Homework Equations (unsure) The Attempt at a Solution Homework Statement Homework Equations The Attempt at a Solution

[FONT=Arial Narrow]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

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...

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

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...

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...

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...

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...

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...

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...

Op Amp -- what is the slew rate limitation? Hello i would like to what is the slew rate limitation?? and why it is good to have higher slew rate? thanks

Homework Statement Hello all, I'm currently in high school and I'm doing a biology experiment with catalase reacting with hydrogen peroxide. I have measured the total amount of gas produced in terms of mL during the reaction which took place over 30 seconds. Throughout the experiment I'm...

Homework Statement A rocket which has an exhaust speed of 8.0 km/s is to have a vertical acceleration of 8.0 m/s2. If the initial mass of the rocket is 6.0x106 kg, at what minimum rate must the rocket consume fuel? Homework Equations F = ma F = RVREL The Attempt at a Solution F...

The function for attitude vs air pressure is f(x) = 2100/x 1. Approximate the instantaneous rate of change at 100 millibars a) Use the equation to calculate the point (100,___) I found the y-value to be 21. b) We need two points to calculate a slope, so to approximate the tangent line we use...

Homework Statement An automobile has a 2.5-litre, four-cylinder, homogeneously charged, direct injected, four-stroke diesel engine. The maximum power output of this naturally aspirated engine is 200 HP at 4000 rpm. By turbocharging, the intake pressure is boosted twice as that for the naturally...

Homework Statement 2 KClO3 (s) + heat --> 2 KCl (s) + 3 O2 (g) If 0.20 g of KClO3 (s) decomposes in 2.8 s, at what rate is oxygen O2 (g) released over this time at SATP? The Attempt at a Solution 0.20 g KClO3 x 1 mol/122.5495 g = 0.001632 mol KClO3 Since 0.001632 mol decomposes in 2.8...

I trying to come up with a way to measure the power output of an engine using a water pump, And I wanted some one to go over my math and check for flaws in my thoughts. My idea is to measure the flow rate and the pressure of the output of the water pump. Using this math to solve for power...

Homework Statement A balloon is being tracked from an observation point 0.42 mi from its launch site. Both the launch site and observation point are on level ground. How fast is the angle of elevation to the top of the balloon increasing at the instant it is 20°, if the balloon is rising...

(a) Find the rate of change of the volume with respect to the height if the radius is constant vol of right circular cone is $$V=\frac{1}{3} \pi r^2 h$$ from this $$h=\frac{3V}{\pi r^2}$$ $$\frac{dh}{dt}=\frac{3}{\pi r}\frac{dV}{dt}$$ $$\frac{\pi r}{3}\frac{dh}{dt}=\frac{dV}{dt}$$ not...

Homework Statement Run-of-the-river projects harness power from the natural flow and elevation drop of a river. In the Brandywine project, water is diverted from the river into a pipe (r=0.75 m) in which it flows down the hill, through the turbine, and returns to the river. The project at...

If the radiation flux is calculated as: F = \frac{L}{2*pi*r^{2}} where L is the luminosity of the source and r is the distance from the source and the count rate of a scintillator \frac{number-of-scintillations}{time} What is the relationship between them? There obviously should be one, as...

1. A ladder 10 ft long rests against a vertical wall. Let θ be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does x change with respect to θ when...

Hey all, new to the forum. Had a tough question that I was trying to work out about an orbiting pulsar and the doppler shifted pulse period. So, if we have a pulsar orbiting some central object in circular orbit, with a constant orbital velocity v, and a pulse period of P_0, how can we write...

Hi, I am working on a rate of change problem and appear stumped with my calculations. S(T) = (-0.03T^2 + 1.6T - 13.65)^-1 S'(T) = (-1)((-0.03T^2 + 1.6T - 13.65)^-2 (-0.03 (2T) + 1.6)) S'(T) = - (-0.06T + 1.6) / (-0.03T^2 + 1.6T - 13.65)^2 S'(T) = (0.06T-1.6) / (-0.03T^2+1.6T-13.65)^2 = 0...

A conical tank (with the vertex down) is $10 \text{ ft}$ across the top and $12 \text{ ft}$ deep. If water is flowing into the tank at rate of $\displaystyle\frac{10 \text{ ft}^3}{\text{min}}$ Find the rate of change of the depth of the water when the water is $8 \text{ ft}$ deep...

If I 8000 gpm flowing in a pipe, and know that pressure of the water is 55psig, will the pressure be 27.5psig if the flow rate through the same pipe drops to 4000gpm.

Find the rate of change of the distance between the origin and a moving point on the graph of $$y=\sin{x} \text{ if } \frac{dx}{dt}=\frac{2 \text{cm}}{\text {sec}}$$

on b) I think this is the point they wanted us to get hope answers are correct its an even problem # so no ans in bk.

if correct? wasn't sure if $$\pi$$ should be in answer since answer is in$$\frac{\text{in}^3}{min}$$