Coefficient Definition and 1000 Threads

i am having some trouble figuring this out I can not figure out which formula to use i have tried Mass x G x Static Friction which resulted in 1 x 2 x 9.8 = 19.6

[SIZE="4"]Definition/Summary For a collision between two objects, the coefficient of restitution is the ratio of the relative speed after to the relative speed before the collision. The coefficient of restitution is a number between 0 (perfectly inelastic collision) and 1 (elastic...

Homework Statement Find the coefficient of x^n in the expansion of each of the following functions as a series of ascending powers of x. \frac{1}{(1+2x)(3-x)} Homework Equations The Attempt at a Solution (1+2x)^{-1} = 1 + (-1)2x + \frac{(-1)(-2)}{2!}(2x)^2 +...

Hi guys, i have some questions regarding Frictional Force that came up in a book. If the cube moves throgh a distance of 4.0m in 2.0s, find the kinetic friction and coefficient kinetic friction between the cube and the plane. ( coefficient of static friction force Us= 0.466, angle of incline=...

Homework Statement Hi, I am doing a theoretical investigation which will be compared to an experimental I'll do later. I am trying to calculate how much time will it take an object to fall a heigh H. the object is a 5x5x5 cm cube. I have the Reynolds number as this Re=3546*Velocity; and I...

Hello everyone, I have a question regarding the accumulated drag curve shown in the figure below for the CFD simulation of external flow over an automobile. (It is written Vehicle Cd in the figure) It can be seen in several regions that the accumulated drag curve is dropping (ie., having a...

Hello everyone, I have a question regarding the accumulated drag curve shown in the figure below for the CFD simulation of external flow over an automobile. (It is written Vehicle Cd in the figure) It can be seen in several regions that the accumulated drag curve is dropping (ie., having a...

Homework Statement An ideal gas adiabatic coefficient γ is submitted to the ABCA cycle of fig, where AB is a line segment.. a) Calculate the income. b) Show that it is smaller than the yield of a Carnot cycle operating between the same temperature extremes. this is my attempt...

Homework Statement The cross section of a wall is shown in the figure below. To reduce the heat flow, an air gap (still air) of 6cm is created between the brick wall layers of 14cm thick, each. The thermal conductivities of the brick wall and the still air are: Kair = 0.032 W/m.K and Kbrick =...

I'm trying to calculate the extinction coefficient of air at 275 nm wavelength. Can someone help me do this? I can't seem to find enough variables in any equation I've been using to figure it out. Thank you

Homework Statement Using basic thermodynamic relations, show that the Joule Coefficient is given by: Homework Equations {\left(\partial T \over \partial V \right)_U}=-{T^2 \over C _v}{\partial \over \partial T} \left(P \over T \right)_V The Attempt at a Solution I started with the cyclic...

Hi, I am trying to understand an equation which I have come across for determining a coefficient based on the size of dimples on a golf ball : CD_Size = R1·(-3.125·(c/d)+0.25) In the description, it indicates that R1 indicates a weight ratio of CD_Size. Can anyone please explain what...

Hi Guys, Just wondering if anyone knows of the friction coefficient of Mud? i am designing a device that gets pulled through fields of thick grass and mud. And i am wanting to know what the friction coefficient of Mud would be so i can calculate the maximum frictional force on the device...

Solve the following system of equations using the inverse of the coefficient matrix, 2x + 4y = -9 -x - y = 2 My attempt- [2 4 [x = -9 -1 -1] y] = 2 |A| x b |A| = -2-4=-6 [x = 1/-6 [-1 -4 [-9 1/-6 [ 1 = 0.03 y] = 1...

I have a byte array of length 16384 bytes obtained from random.org/bytes. There is a random number sequence test program available from http://www.fourmilab.ch/random/ that, when run on my byte array, returns the following: Entropy = 7.989469 bits per byte. Optimum compression would reduce...

1. A ball is launched against a solid wall with straight trajectory and a velocity of Vo. It hits the wall on a 3ft height and it falls on the ground at a 2ft distance (by the left of the wall). Then, an elastic platform is positioned on the exact height of the collision of the ball, and it is...

Homework Statement What is the mass transfer coefficient for natural convection from rock salt (assume flow is over a horizontal cylinder (salt crystal) of length 2cm, diameter 0.5cm). Given: Temperature = 24degrees Density of salt 2165kg/m^3 Density of mixture when salt...

Hi all, I have a problem in evaluating Fourier coefficient. I have an array of numbers (which is a magnetic field) taken on a circle of radius 8mm and I want to know the harmonics of this field. I have written a code in matlab, I have used some in built function in MATLAB and mathcad, but...

Homework Statement Find the Taylor series for 0.5x^2[e^x-e^(-x)] around x=0. What is the coefficient of x^n? Homework Equations e^x=∑x^n/n! The Attempt at a Solution I understand how to find the Taylor series for this equation (it being ∑[x^(2n+3)/n!]; x^3+x^5+x^7/2!+...) through...

I need a question answered. If given the density of 2 materials in a composite, the fibres & the matrix, but not the over all density of the composite, how can one go about finding the thermal expansion coefficient, alpha of the composite? I have Youngs modulus, density of each individual...

Homework Statement Find the applied force for a object if the coefficient of kinetic friction equals 0.30 and the acceleration equals 5m/s^2. The applied force makes a 40 degree angle with the horizontal. The mass of the object is 10kg. Homework Equations Fnet=ma The Attempt at a...

Hello, I am having major confusion for how to find the damping coefficient, α, and the resonance frequency, ωo, for a second order circuit, in general. I know that there are tables for standard circuits like a series RLC and parallel RLC giving those values, but I am certain that I need to know...

Homework Statement block is placed on a ramp at an angle of 39.4 and height of the ramp is 1.610m and the mass of the block is 8.54kg if coefficient of kinetic friction is 0.111 and the coefficient of static friction is 0.173 what is the speed of the block at the bottom of the ramp. if it...

Homework Statement Two wires A and B are connected in series at 0oC and resistance of B is 3.5 times that of A. The resistance temperature coefficient of A is 0.04% and that of the combination is 0.1%. Find the resistance temperature coefficient of B. Homework Equations Rt=R0(1+α0t)...

Homework Statement This an example from Boyce+DiPrima's text on ODEs. Original problem is to solve 2t2y''+3ty'-y=0, given that y1=1/t is a solution. But I'm stuck at the part where I'm to solve 2tv''-v'=0, v being the second unknown solution. The Attempt at a Solution In the text...

Homework Statement A 100 N force directed 37° below the horizontal is applied to a 30 kg object on a horizontal surface. If the magnitude of the acceleration of the object is 1.3 m/s2, what is the coefficient of kinetic friction (μk) between the object and the surface? Homework Equations...

Homework Statement Determine its 13^{th} Taylor coefficient of the Taylor Series generated by f at x = 3. f(x)=e^(7x) Homework Equations I used the fact that the series for e^x was ∑x^n/n! The Attempt at a Solution Using that above, and replacing x with 7x, shouldn't my answer...

Homework Statement F(x)=7x Determine the 13th taylor coefficient of the taylor series generated by f at x=3 Homework Equations Well, it looks like I just had to take the derivative, but by the time it gets to the 13th derivative, wouldn't the answer just be zero? The Attempt at a...

Homework Statement A body is fired from point P and strikes at Q inside a smooth circular wall as shown in figure. It rebounds to point S (diametrically opposite to P). The coefficient of restitution will be: (Ans: ##\tan^2\alpha##) Homework Equations The Attempt at a Solution...

Hey! :o "Let the polynomials $$f(x)=1+\sum_{k=1}^{8}{(2k)x^{2k}} \text{ and } g(x)=1+ \sum_{k=1}^{8}{(3k)x^{3k}}$$ of $\mathbb{Q}$. Without calculating $f(x)g(x)$, find the coefficient of $x^{21}$ at $f(x)g(x)$." Let's consider $f(x)=\sum_{k=0}^{\infty}{a_kx^k}$ and...

Given two coefficient binomials \binom{a}{b} and \binom{c}{d} is possbile to express the sum and product those coefficient binomials as one other?

If we have a constant coefficient second order homogeneous ODE, the way to solve this is to suppose a solution of the exponential type. This yields a second order polynomial equation (the "characteristic equation") that the exponent must satisfy. In case the solutions of the characteristic...

Could someone explain to me the difference in calculating the coefficient of drag with thrust, and without. What causes the difference in application?

"A hockey puck is hit on a frozen lake and starts moving with a speed of 12 m/s. Exactly 5.0 s later, its speed is 6.0 m/s. What's the puck's average acceleration? What is the coefficient of kinetic friction between the puck and the ice?" I've calculated the acceleration, but I'm stuck when it...

Homework Statement Why is the correlation coefficient between -1 and +1? Homework Equations we know correlation coefficient \rho = \frac{E[xy]-E[x]E[y]}{\sqrt{\sigma_{x} \sigma_{y}}} OR r = \frac{\sum ^n _{i=1}(X_i - \bar{X})(Y_i - \bar{Y})}{\sqrt{\sum ^n _{i=1}(X_i -...

Hi all, I am trying to calculate the damping coefficient of a linear viscous dashpot/damper given the dimensions of the piston, and the dynamic viscosity of the damping fluid. I have found this calculator, but does anyone know the equation that it uses...

Suppose in the reaction 2 NO + O2 --------> 2NO2 Why when the the concentration of NO is doubled, the rate increases 4 times, I know that the rate is directly proportional to the square of NO concentration (I don't know why) and it's order of reaction is 2 ( I don't why ). but I still can't...

Homework Statement A box rest on an incline making a 34 angle with the horizontal. It is found that a parallel force to the incline of at least 235 N can prevent the box from sliding down the incline. If the weight of the box is 800 N, find the coefficient of static friction between the...

Does anyone know where I can get those values? Haven't been able to find them anywhere

Homework Statement I wish to determine whether a SINGLE instrument provides reliable measures (test-retest reliability). This single instrument is not random (it's the only one available), and I will take 10 measurements for each individual that is part of a control group (and then again for...

Are there any theories or thoughts that view spacetime as 'having' a coefficient of thermal expansion... analogous to the CTE of water? An inflection with density in regards to temperature?

On this site I found how to calculate Cd and Crr coefficient from experimantal data: http://www.instructables.com/id/Measure-the-drag-coefficient-of-your-car/ I am trying to implement it in a web page and in a smartphone application, so I must "replace" Excel Solver by an algorithm, but I'm...

1. a 5.0 kg block is pushed up a wall by a 90N force. Assume that the block starts from rest and that it has an acceleration of 0.5m/s^2. a. find the coefficient of kinetic friction between the block and the wall. b. Find the work done by each force acting on the block. c. Find the...

Homework Statement Two conductors are separated by an insulator. Model the insulator as a square barrier of height 0.01 keV and a width of 5nm. Determine the transmission coefficients for electrons of 7,000 meV. The only thing is I have to use the approximation formula for finding the...

I have an example problem in my book. I have uploaded an image. The part I can't figure out is how to do the last part of the problem to come up with the transmission coefficient. The book gives me a formula but when I plug in all the numbers from the formula into my calculator I get a...

Homework Statement A 30kg sled is sliding on a frictionless sheet of ice at a velocity of 4m/s. The sled encounters a rough patch of ice and begins to slow down. After traveling on the rough patch of ice for 3m, the sled's velocity is 2m/s. Determine the coefficient of friction between the...

1. Homework Statement and the attempt at the solution Alright, here is a picture of the problem along with my solution: My solutions gives the correct answer but the only part I don't understand is why the heat transfer coefficients are the same. If the two rods are made of different...

Homework Statement Hi, i have a little problem with a demostration, I hope you can help me. Homework Equations this said that we have a system, a gas is containing in a recipe, there's no heat exchange neither work with the enviroment, only an expansion v to 2v, we have to find that...

1. a worker can supply a maximum pull of 150 lb on a cart w/c has a handle set at an angle of 40° above the horizontal. what is the coefficient of friction if he can just move a total load of 1500 lb ? 2. μ = Ff/mg 3. so i solved it by 150sin(40) divide by 1500cos(40), but I'm not...

Homework Statement Two men loading a 900 kg piano onto a truck lose control and the piano slips, rolling down the loading ramp. The ramp is a 12 degree incline that is 3.2m long. If the piano accelerates down the ramp at 0.4m/s^2, find the coefficient of rolling friction. Homework...