Kinetics Definition and 234 Threads

Homework Statement With what intial velocity must an object be thrown upward (from ground level) to reach the top of the Washington Monument (approx 550ft)? Homework Equations Here's what I know: s(0)=0 a(t)=-32ft/s^2 s(t_{max})=550\\ s'(t_{max})=0 The Attempt at a Solution...

Homework Statement This is straight off an old AP Exam, but I can't seem to find it online so I'm hoping you all can help me out. 2 NO(g) + Br2(g) --> 2 NOBr(g) The following results were obtained in experiments designed to study the rate of the reaction above. Experiment Initial...

1. A 100 kg satellite is placed in a circular orbit 3500 km above the surface of earth. At this elevation the acceleration of gravity is 4.09m/s_{2}. Determine the kinetic energy of the satellite , knowing that its orbitial speed is 22.9 x10_{3}km/h The answer:30.3 GJ ===== I have drawn...

Homework Statement The problem is shown in the attachment. Homework Equations Mo = Ia MgL/2 = moment of inertia of the bar Io = Ig + md^2 parallel axis theorum The Attempt at a Solution I found the moment of inertia of the bar about its center of mass: MgL/2 = (4.6*9.81*1.3)/2...

Homework Statement The initial concentration of reactant in a first-order reaction is 0.75M. The rate constant for the reaction is 2.75/s. What is the concentration (mol/L) of reactant after 6.5s? Homework Equations -kt=[A]initial/[A]anytime The Attempt at a Solution...

Hi! I want to make sure I have the right handle on this. Fick's law relates to dispersING solids, whereas Einstein's law of diffusion indicates disperSED particles, Stoke's law illustrates sedimentation and D=kT/6πηNa=RT/6πηaN is the overall equation relating all of the above to...

Hi everyone I need some help with this problem - The first order rate constant for the decomposition of N2O5 at 70 degrees celsius is 6.82x10-3 s-1 2N2O5 -> 4NO2 +O2 Suppose we start with 25 mmol of N2O5 in a volume of 2L. How many mmol of N2O5 will remain after 2.5 min? I'm not...

Hi everyone, I have a difficulty of the following Dynamics (kinetics) problems (from Hibbeler’s Eng Mech Dynamics, 11E book) PROBLEMS 12-26 Ball A is released from rest at a height of 40 ft at the same time that a second ball B is thrown upward 5 ft from the ground. If the balls pass one...

Homework Statement A space vehicle returning from the Moon enters Earth’s atmosphere at a speed of about 4.9E4 km/h. Molecules (assum nitrogen) striking the nose of the vehicle with this speed correspond to what temperature? Homework Equations KE=0.5mv^2=kT k: constant The Attempt...

Homework Statement A 200kg body is supported by wheels @ B to roll freely w/o friction & by a sled @ A with which uk = 0.5. Compute the value of P to cause an acceleration of 0.02g. (g=9.8m/s^2) NOTE: Image not drawn to scale. http://www.geocities.com/timothybridge/kinOftrans.JPG...

hey. I am doing an investigation into reactions of acids with Mg. Firstly, iv investigated how order with respect to the acid varies for different acids i found that the orders for each of the acids are: Hydrochloric acid: 2 Sulphuric acid: 1 Phosphoric acid: 1.8 in an article, it said that...

Multiple-Concept Example 7 explores the approach taken in problems such as this one. The blades of a ceiling fan have a radius of 0.375 m and are rotating about a fixed axis with an angular velocity of +1.95 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an...

Okay I suck at physics and if someone could help me out it would be greatly appreciated. A ball is projected horizontally from the edge of a table which is 0.8 m high, as shown below. The ball lands 0.2m from the table How long does the ball take to fall to the ground? Worked it out to be...

Hello, I have the following mechanism: NO + NO -> N2O2 and N2O2 + H2 -> N2O + H2O We need to identify intermediates in the mechanism. I have no idea how to do that. In case it helps, here are the answers (not sure they are right, but I think they are) to previous questions in the...

Hello everyone, I have been working on several exercises for the past several days, and there are some I just can't seem to do. I would appreciate some help! =) 1) We have the following reaction: C2H5Br (alc) + OH(-) (alc) --> C2H5OH (l) + Br(-) The (-) indicates it's an ion. The...

In a paper, I encountered a system modeled by six coupled first-order differential equations like so: \frac{dm_i}{dt}=-m_i+\frac{\alpha}{1+p^n_j}+\alpha_0 \frac{dp_i}{dt}=-\beta(p_i-m_i) , where i=1,2,3 and j=3,1,2. According to the paper, the system has a unique steady state which becomes...

Kinetics in Nromal and Tangential coordinates - SPINNING ROD W/ SPOOL The 2-kg spool fits loosely on the inclined rod for which the coefficient of static friction is \mu_s\,=\,0.2. If the spool is located 0.25 m from A, determine the maximum speed the spool can have so that it does not slip up...

We are currently studying reactions in terms of kinetic energy, reaction rates, collision theory, and so on. There is a question on my assignment that is kind of boggling me right now: An increase in temperature of 10 C rarely doubles the kinetic energy of particles, and hence the number...

can anyone pls explain to me what is sliding and rolling of a let say a wheel??I'm really confuse about it thanx

I am completely stuck on a couple of questions and would like a bit of help on these. First one. This I have no idea where to even start and I can't find anything on it in my text either. So maybe a formula or point me in the right direction would help.:biggrin: Calculate the fraction of...

How we can face the speed of the molecules on the gas kinetics theory and the speed barrier of light ? because v=sqrt(3kT/m) were k is boltzman T = kelvin and m = mass of the element remember the huge T of the big bang

A 7 kg box increases its speed form 2 to 4 m/s over a horizontal distance of 5 meters. coefficient fo kinetic friction is .1. what was the average force applied tothe box int he direction of the motion?

kinetics of an iodine clock reaction? i am currently writing up my lab report (from a week ago, i know, i should do it straight away...) on the kinetics of an iodine clock reaction and am calculating the order of the reaction and have taken a wrong turn in my calculations. instead of going...

I'm really having trouble with this question, can someone help me with an explanation? Is it possible to vary the factors of concentration, surface area, and temperature in a way that would prevent a reaction from happening? explain your answers in terms of collisions. Will catalysts...

would reactions happen faster in heterogenous rxns or in homogenous? also, i was wondering if i am correct in assuming that heterogenous & homogenous reactions affect: temp, concentration, nature of reactants and catalysts? only surface area affects heterogenous. for this question, would u...

Plea for help with kinetics lab -- Urgent I am trying to find a value for the activation energy of the reaction involving potassium permanganate and oxalic acid. I have scoured every free chemistry database on the internet and come up with nothing. Does anyone know how I can calculate this...

need urgent help with chemistry lab - kinetics Where can I obtain the accepted value for the activation energy of the reaction involving potassium permanganate and oxalic acid? I did the first part of the lab, which involved finding the rate law experimentally, correctly. But I ran out of...

HI While working on some chemical kinetics problems, I came across the statement, the fraction of activated molecules is 10^{-15} in a problem where some other constants were also provided and the half life was to be found (for a first order reaction). My specific query is: Is this...

The rate constant for a certain reaction has the units concentration/time. What is the order of the raction? A. 0 B. 1 C.2 D.3 My reasoning: K = [A]^m x [B]^n Since the concentration/time is to the power of one, both m and n must be one i think which give an overall order of...

A steel ball has a mass of 4 kg and rolls along a smooth level surface at 62 m/s. a) Find its kinetic energy ( i found this.. ) b) At first, the ball was at rest on the surface. A constant force acted on it through a distance of 22 m to give it the speed of 62 m/s. What was the magnitude...

QUESTION: The 50 kg uniform crate rests on the platform for which the coefficient of static friction is us = 0.5. If the supporting links have an angular velocity w = 1 rad/s, determine the greatest angular acceleration they can have so that the crate does not slip or tip at the instant theta...

So, we were given a set of data of [S] (uM) and the Velocity (umol/minute) of an inhibitor and no inhibitor. we are supposed to find the values of Vmax and Km in the absence of inhibitor and in the presence. do I use 1/Vo = 1/Vmax + Km/Vmax - 1/[S]? but what is Km and the intial...

Hi. I'm designing a computer game at the moment (it's still in the theory stages right now, since I can't get much done until I've got a working engine for it) -- I make 'ammateur' games as a personal hobby in my free time. However, my latest attempt is a bit more mathematically ambitious than...

[SOLVED] Kinetics of Electrolysis Can you help me with this problem? Assumptions: 1- Electrolysis of seawater at 1,000 ft. 2- Gases are generated having buoyancy, probably chlorine, hydrogen, oxygen 3- Gases are captured as they rise and mechanically converted to electrical energy to...