Coefficient Definition and 1000 Threads

Homework Statement A car is sliding down an icy hill inclined at 1.6 degrees, find the coefficient of friction. Homework Equations f_k=\mu_k*n The Attempt at a Solution Don't know how to begin it only given the angle of the hill.

Homework Statement A block(7 kg) is released from rest on an inclined plane of 23 degrees and moves 2.8 m during the next 4.7 s. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the acceleration of the block? What is the coefficient of kinetic friction for the incline...

Let's say there is a conducting plane of conductivity \sigma. Boundary conditions for above and below such plane are: E_1^t = E_2^t (D_2 - D_1 ) \cdot n = \rho i.e. tangential components of E field are continuous and perpendicular components of D are discontinuous because of surface charge...

Homework Statement A block is at rest on a plank whose angle can be varied. The angle is gradually increased from 0 deg. At 25.7°, the block starts to slide down the incline, traveling 3.50 m down the incline in 1.50 s. Calculate the coefficient of static friction between the block and the...

I have this homework question: A sled is pulled with a horizontal force of 15 N along a level trail, and the acceleration is found to be 0.40 m/s2. An extra mass m = 4.3 kg is placed on the sled. If the same force is just barely able to keep the sled moving, what is the coefficient of kinetic...

Homework Statement What exactly does partition coefficient tell us? if I have a low partition coefficient, does that mean its less soluble in that compound? Homework Equations The Attempt at a Solution I had .0555g Benzoic acid mixed with water and methylene chloride. It...

Homework Statement A particle of mass m, (nonrelativistic) energy E, spin 1/2 and magnetic moment \mu*\sigma is traveling in the positive x-direction from large negative x. For x > 0, there is a constant magnetic field B in the positive z-direction. There is no field for x < 0. a) Find...

Hello. I have a question, mathematical in nature. Considering a potential step of height V0 and width a, the amplitude coefficient is t=\frac{2k_1k_2e^{-ik_1a}}{2k_1k_2\cos{k_2a}-i(k_1^2+k_2^2)\sin(k_2a)} Now the transmission coefficient is T=|t|^2 So I need to find the absolute value of...

I have a circular cross-section of steel, around which I have air of constant temperature flowing. I want to calculate the heat flux, but I don't have the value of heat transfer coefficient,h (W/m^2.K) between steel and this air at 350C. Please suggest how to get the value for h. I am neglecting...

It's been two years since Algebra I, and I forgot a lot. I'm doing a review of solving equations, and every single one includes fractions. I don't like fractions. The easiest one is as follows (simplified to an improper fraction): 4/3x = 5. If I remember anything about solving equations with...

Can anyone PLEASE help me in pointing me in the right direction? I need to obtain drag coefficient calues for I-beams. I found a site stating it was 2.7, but it says nothing about the orientation?? I basically need the Cd-value for flow parallel to the I-beam, from the top and from the side...

Homework Statement https://skydrive.live.com/?cid=6b041751c72e14ad#!/?cid=6b041751c72e14ad&sc=photos&uc=3&id=6B041751C72E14AD%21149!cid=6B041751C72E14AD&id=6B041751C72E14AD%21154&sc=photos The Attempt at a Solution...

Homework Statement Prove that the volume thermal expansion coefficient of a solid is equal to the sum of its linear expansion coefficients in the three directions. \beta=\alphax +\alphay+\alphaz For isotopic solid when \beta = 3\alpha Homework Equations \beta=[1/v][dv/dt]p= \alphax...

Homework Statement A bus passenger has her laptop sitting on the flat seat beside her as the bus, traveling at 10.0 m/s, goes around a turn with a radius of 25.0 m. What minimum coefficient of static friction is necessary to keep the laptop from sliding? Given: V = 10 m/s r = 25.0 m...

Homework Statement from giancoli 5th ed (algebra based) chapter 4, question 42 Drag race tires in contact with an asphalt surface probably have one of the higher coefficients of static friction in the everyday world. Assuming a constant acceleration and no slipping of tires estimate...

This question this struck me as fairly simple until I repeatedly tried and failed to get the right answer so any help would be greatly appreciated. Homework Statement A block of mass 30 tonnes is to be dragged across the floor by means of the smaller body (mass 5 tonnes) acting through the...

Hi, this problem’s been bugging me for ages. I’m sure it’s just a simple misunderstanding somewhere on my behalf but I just can’t seem to get my head round it. Homework Statement A monorail car with front wheel drive and mass of 5 tonnes is suspended from two wheels 10m apart as shown. Its...

Homework Statement At a construction site, a small crane is raising two boxes of nails on a plank to the roof. One box has already been opened and is half full, while the other box is new. The boxes, including the nails, weigh 10kg (box 1) and 20kg (box 2), respectively and are both the same...

Homework Statement Hi can anyone help me calculate the coefficient of friction between crates and a conveyor belt. The crate is moving up a 25O angle at a constant speed to a height of 12m. Homework Equations CoF=F/R The Attempt at a Solution I don't know if this is a trick...

Homework Statement m = 10kg static friction coefficient (Us) = 0.4 angle = ? Homework Equations If the coefficient of static friction is 0.4, calculate the angle at which the box begins to slide down the plank as it tilts. The Attempt at a Solution m = 10kg Us = 0.4 angle...

Homework Statement A train is traveling at 3.73 degree incline at a speed of 3.25 m/s, when the last car breaks free and begins to coast without friction. (i) How long does it take for the last car to come to rest momentarily? (ii) How far did the last car travel before (momentarily)...

How to derive expresssion for coefficient of kinetic and static friction?

Homework Statement I see graphs for the total mass attenuation coefficient such as this all over the web:http://scientificsentence.net/Radiations/images/attenuation_coefficients.jpg However, I can't find data on the individual attenuation coefficients such as the photoelectric or Compton...

Homework Statement A pig is sliding down a ramp that has an angle of 35 degrees from the horizontal plane. If the friction coefficient was 0 the ride would only take half the time. What is the kinetic friction coefficient between pig and ramp?Homework Equations Fnet = ma v² = u² + 2as a =...

a vase contains one red ball two white balls and three black balls. n balls are take out of the vase and (each ball returned to it afterwards). let B denote the number of black balls taken out and R denote the number of red balls taken out. what is the coefficient of correlation between R and B...

Hello all, I come from musical sciences, but I'm trying to learn something about acoustics, so here I am, asking for some help about the impedance tube sound absorption coefficient test. I have and impedance tube, two microphones technique (ISO 10534-2), B&K microphones connected to the...

Homework Statement To a very good approximation, ammonia obeys the Bertholet equation of state, which readsPV=nRT+\frac{9}{128}(\frac{nRTc}{Pc})(1-6\frac{Tc^2}{T^2})Pa)Suppose we have 500 grams of ammonia under a pressure of P=3.04 atm and at T=323K. Calculate the volume of ammonia according...

Homework Statement Calculate the coefficient of friction between a fuzzy block and dynamics cart? This is a Lab task so I have all the materials but I don't know where to start. Homework Equations u=ff/fn uk=fk/fn us=fs/fn The Attempt at a Solution I tried using the formulas...

R'' + 2rR' - Rl(l+1) = 0, where R = R(r) and l is a constant. This is portion of sol'n by separation by variables to laplace's equation in spherical coordinates. I tried laplace transform, but reached integral that I don't think admits analytic sol'n. F'(s) + F(s)[\frac{1 + l(l+1)}{s} -...

Hi, I am looking at the following 2nd order DE with variable coefficient: y''(x)-(1/x+7)y(x)=0 I would be grateful for any help in regard to methods which may be applied to such an equation. Many thanks in advance! C.

Homework Statement The two identical steel balls A and B moving with initial velocities VA = 6 m/s and VB = 8 m/s collide, as shown in figure Q4. If the coefficient of restitution is e = 0.7, determine the magnitude and direction of the velocity of each ball just after impact. (See...

Homework Statement The correlation coefficient for each of two data sets is calculated. Set A has r = -0.75 while Set B has r = +0.55. Which set (A or B) has the stronger strength of relationship? Homework Equations I think -0.75? The Attempt at a Solution I think Set A r =...

Homework Statement This is an example from Gasiorowicz's Quantum Physics. "Example 3-1" is a particle in an infinite potential-well, but that should not matter. Homework Equations The Attempt at a Solution Why is P(-2) (which I suppose is the probability that the eigenvalue -2 is...

A slotted line used on a 150ohm lossless transmission line connected to an unknown load impedance, ZL. The voltage standing wave ration is found to be equal to 3. The distance of the first voltage maximum from the load is found to be 9 cm, and the first voltage minimum is located at 3 cm from...

Homework Statement For the resistance versus temperature graph below, find (a) the resistance at T = 20°C and (b) the temperature coefficient of resistance alpha . http://tinypic.com/r/jhufkn/7 I don't know if the graph is showing up or not, it isn't for me... so here's the link...

Homework Statement A Fletcher's trolley apparatus is set up with a block of wood of mass 4.0kg and a suspended mass of 2.0kg. The Attempt at a Solution a) Calculate the acceleration of the sys. and the tension in the string when the mass is released. m1 FnetX = [T - Ff = m1(a)] FnetY...

Let K be a field of characteristic p. Suppose f(x)=(xk+ck-1xk-1+...+c0)(xp-k+...) in K[x] with 1≤k≤p-1. My question is: 1. since f(x) in K[x], can I conclude g(x)=xk+ck-1xk+...+c0 in K[x] as well? 2. We see that in general if g(x)=xk+ck-1xk-1+...+c0 then ck-1=-(α1+α2+...+αk) where...

Is it possible to find the coefficient of friction just by looking at a graph? A velocity-time or acceleration-time graph which models a particle going up a ramp and down a ramp.

Homework Statement We're given this 'interactive page' that gives us the values, so T=2.8066, W=0.9542 and A=8.5988 and then told to find a0, b0, a1, b1, a3, b3, Total Power and 3rd harmonic power. Homework Equations Cn given above and: a0=1/T \int s(t) dt integrating from 0 to T. Also...

Hi! A block with mass 35 kg is pushed upward with a horizontal force of 400N along a slope at an angle of 30 °. The block makes a displacement of 2 meters, where it's speed changes from 1m/s to 1,8m/s. What is the Coefficients Of Friction? 1) 0.312 2) 1.099 3) 0.039 4) 1.31...

I noticed these patterns when calculating some co-efficents in functions having this pattern. I would appreciate a better understanding of it, so if you can put in any input that may help, that would be awesome. Also, I tried to explain the pattern as best as I can. Let a set A = {a1, a2...

Homework Statement The copper windings of a motor have a resistance of 5.8ohms at 22degrees when a motor is idle.After runnning for several hours the resistance rises to 6.8ohms. what is the temperture rise of the windings? assume a constant temperture coefficient of a = 5*10^-3 Have i...

Homework Statement Prove mathematically that the coefficient of friction is independent of the mass of a rider at a fixed location from the center on a merry go round. Homework Equations F = ma? The Attempt at a Solution I honestly don't know - I can't find two starting equations...

Hi all, this is my first post. I find a lot of conflicting definitions of damping factor, damping coefficient, and damping ratio on the internet, and in some textbooks, when related to RLC circuits. Sometimes I see the neper frequency described as the damping factor or damping coefficient...

Hello every one, I wish i can some help in my mathematica programing. I hane k <= 20, k is + integer. n = 1/12(3(5 - 2Sqrt[6])^k) what I need to do is for every value of n (comes from K ofcourse), Print the minmum coefficient for (1 + x)^n %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%...

Hi all :) I'm trying to figure out how much heat I can save from covering a tank which is open (uncovered). The tank is rectangular made of steel and is filled with water, heated to 50C, and is not insulated with any material. The outside temp and humidity is assumed to be 25C and 60%...

Why do we call the attenuation coefficient LINEAR? I(x)=Ioexp[-µx] why µ is called linear?

Hi I am currently trying to work out the drag coefficient of a car, I know the formulae to work out CD, this being CD=FD/0.5xρv^2A. I can not figure out how to find FD as the formulae for this requires CD. Is there another way to find FD? The information I have is as follows: Car Mass: 1350 kg...

Hi I am currently trying to work out the drag coefficient of a car, I know the formulae to work out CD, this being CD=FD/0.5xρv^2A. I can not figure out how to find FD as the formulae for this requires CD. Is there another way to find FD? The information I have is as follows: Car Mass...

I have been trying to find this on the internet but am having no luck. What do you guys think the coefficient of restitution for a baseball hitting a human beings body would be if the baseball were traveling at 100mph and the baseball player that it hit were stationary. I know it's hard to...