Coefficient Definition and 1000 Threads

f(x)=(1.2x-11 + 1.5x7)20 (1.25x21 + 1.7x-0.05)50 Given the function above, by binomial expansion, Xn appears to be the term with the largest coefficient. Determine n and hence state the corresponding coefficient. Would like to know the method of doing this question in an easier way.

Homework Statement A crate of weight Fg is pushed by a force P on a horizontal floor. (a) If the coefficient of static friction is μ s and P is directed at angle θ below the horizontal, show that the minimum value of P that will move the crate is given by P = usFgSecθ / (1 - usTanθ)...

A 3.40 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, as in the figure below. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between block and ceiling...

A 3.40 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, as in the figure below. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between block and ceiling...

A 3.40 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, as in the figure below. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between block and ceiling. Ugghhh so...

Homework Statement I have two problems with this: 1) I am not sure if I am using the right constant. 2) I have no idea if my values are realistic. The actual question: The rate of a reaction is 25.00 units per time at 20.00°C. The activation energy barrier for this reaction is 1.50 eV. a)...

Heres the problem, A 1,440-N crate is being pushed across a level floor at a constant speed by a force of 270 N at an angle of 20.0° below the horizontal (a) What is the coefficient of kinetic friction between the crate and the floor? I know how to do this. The answer is .165 Heres...

reflection coefficient gamma = ZL-Z0/ZL+Z0. My question is can you calculate the reflection coefficients when ZL has a real and imaginary?Lets say that Z0=50 ohms and ZL = 125 +j40. All my example in books show ZL and Z0 being real only. Well how do you determine reflection coefficients...

The Known: Mass=2000kg Velocity=50m/s Radius=1000m With the given information the lab worksheet I'm working on is asking me to deduce the coefficient of friction so that I can manipulate the data and answer some questions. The problem I have is that I am not entirely sure that this could...

Homework Statement Two equal balls are in contact on a table. A third equal ball strikes them simultaneously and remains at rest after the impact. Show that the coefficient of restitution is 2/3. I have attached an image for clarity of problem. Please open it. Homework Equations...

Hi all, I know this may see basic but how would I go about calcualting Impact velovity? The only information I have is: Height dropped, height bounced and from here I can calculate the CofR... But how would I go about finding impact velocity

Homework Statement A 1980kg car starts from rest at point A on a 5° incline and coasts through a distance of 158m to point B. The brakes are then applied, causing the car to come to a stop at point C, 21m from point B. Knowing that slipping is impending during the braking period and neglecting...

Hello, I am currently taking a college level chemistry class. I am struggling with this problem, any help would be greatly appreciated. Homework Statement We have a certain quantity of CuSO_{4} \cdot \gamma H_{2}O If our sample is formed of (25,5% Cu), (12% S), (57,7% O) and (4.04% H)...

Homework Statement A crate is placed on an inclined board. The coefficient of friction between the crate and the board is 0.26 , and the angle of the slope is 16 degrees. Calculate the acceleration of the crate down the incline. Homework Equations F=ma Ff=umgcos(theta) Forge of gravity...

I have read that the attenuation of water (for ultrasound) is 0.0472 Np m–1 (MHz)–2. What is this in dB/cm/MHz^-2 ? What is Np? thanks

Homework Statement So basically this is a two part question, first part was find acceleration of the system (which i already found) with a coefficient of friction of 0.1. B) asks you what coefficient you need for the object not to move? Homework Equations The Attempt at a...

1. how do i solve X'(t)=A(t)X(t) Homework Equations I know of this equation: x(t) = x_0 \exp\left( \int_{t_0}^t f(\xi) \, d\xi \right) but i think that I'm using it wrong. The Attempt at a Solution i have the following mathematica code: A= x = MatrixExp[Integrate[A, {t, 0, s}]].{1, 0,0,0}...

Hi, i have a set up where i have a block of wood with sandpaper on the bottom, and a 500g mass on top. Given the grade of the sandpaper, i know the average particle size on the sandpaper. This set up is placed on top of a piece of MDF. Is there a way I could calculate the coefficient of...

My friend was telling me that charge arises as a coefficient of the Lie Algebra. Can someone give me a demonstration of this please, I was most fascinated by it because I had never heard of this before. Regards!

Homework Statement (there's a diagram that shows a crate on a plane inclined 19.29° above the horizontal) Find the coefficient of kinetic friction. θ = 19.29° mcrate = .205 kg Homework Equations Ff = FN*μk Fg = mg FN = cosθ*mg The Attempt at a Solution I drew out a free-body diagram for...

We have $f(\theta) = \theta^2$ for $-\pi < \theta\leq \pi$. $$ a_0 = \frac{1}{\pi}\int_{-\pi}^{\pi}\theta^2 d\theta = \frac{2\pi^2}{3} $$ $$ a_n = \frac{1}{\pi}\left[\left.\frac{\theta^2}{n}\sin n\theta\right|_{-\pi}^{\pi}-\frac{1}{n}\left[\left.\frac{-\theta}{n}\cos...

$f(\theta) = \theta$ for $-\pi < \theta \leq \pi$ $f$ is odd so $\sum\limits_{n = 1}^{\infty}a_n\sin n\theta$. $$ \frac{1}{\pi}\int_{-\pi}^{\pi}\theta\sin n\theta d\theta $$ So I have that $$ a_n = \begin{cases} \frac{-2\pi}{n}, & \text{if n is even}\\ \frac{2\pi}{n}, & \text{if n is odd}...

Hi, for the deutron triplet state, I am trying to find the coefficient using the lowering operator but I kept getting 0 hope someone can help me. Using J-|j,m>=[(j+m)(j-m+1)]1/2|j,m-1> I can get from |++> to 1/\sqrt{2}(|-+> + |+->) but from here I am stuck since j+m=0 for |+->. What is...

Homework Statement The coupoing coefficient of K' of a linear transformer is adjusted so that Zab is purely reissitive when ω= 25k rad/s. What is Zab? Homework Equations Not sure The Attempt at a Solution I'm not sure how to being this problem. For one, from what I've been...

I have a part that will slide by it's own weight (50lbs.) at 12 degrees on two parallel shafts. I need to reduce the angle as much as possible. By rotating the shafts, I would reduce the coefficient of friction between the part and the shaft. How would I find the new value of friction due to the...

How do I tell what the coefficient of viscosity is of SAE 10W-30 oil? It is at 25 degrees C. My book says that multigrade oils like this have a non Newtonian blending additive. This doesn't mean I have to treat the substance as non Newtonian does it? Any help would be appreciated.

I'm modeling a moving cart, and I'm trying to determine if the coefficient of kinetic friction changes as a function of speed. Does anyone know of any literature where this is discussed, or if this happens? I would've thought friction solely depends on the types of materials used.

Different correlation coefficient results between Matlab and Excel. Please Help! I have two sets of dat as below. A problem is that MATLAB and excel returns a different value of correlation coefficient (i.e., 0.801 from Excel and 0.786 from Matlab). For Matlab, I used the function...

Hey. Working on a project at the moment, where i have to simulate a human arm (hand and lower arm). I need to find the spring constant, k, and dampening coefficient, c. You got any good ideas on how i can do that? So far i tried by measuring the mechanical impedance, and saying the arm is a...

Homework Statement We are having a fictive, non existing heat exchanger with the following parameters: Outer tube diameters: 20 & 12 mm Wall thickness inner tube: 1mm, outer tube; 2 mm flow area hot side: 0.0226m2, cold side; 0.0272 m2 The heatexchanger is going to cool some hot...

hello, i am trying to calculate thermal stress on sphere, considering chage in temperature causes chage in volume of the sphere so needed volumatric expansion coefficient of steel; i have a data about mean coefficient of thermal expansion for 316ss..is there any way to calculate volumetric...

Homework Statement A homework problem asks me to find the Fresnel coefficient for a linearly polarised plane wave, which is incident under an angle theta, whose electric field vector can be given as: E=Ecos\hat{s}+Esin\hat{p} \hat{s} and \hat{p} are the unit vectors for s-polarised and...

I am trying to develop a spreadsheet to calculate a convection coefficient with altitude as one of the inputs. What variables should I consider? The most obvious are pressure and temperature, but I'm sure there is more to it than that.

I am trying to model the Seebeck coefficient and the electrical conductivity and lattice thermal conductivity for a thermoelectric material from the BTE using the RTA. I have two questions. 1. I am going to calculate each band separately and add. The electrical conductivity per band can be...

We all know that if the covariance is positive then it means that if one increases then the other one also increases. If the covariance is negative it is the other way round. I know to calculate the covariance and deduce the relation between them. But I don't get an intuitive feeling regarding...

Can someone please help me with this. I read on wikipedia that the coefficient of Variance can be used when the measurements are of ratio scales but cannot be used on interval scales. I know it is useful to use it to compare samples with completely units like the variance in your mass...

Hello everyone, I have a question (perhaps a very noob one as well!) regarding correlation between variables where the number of observations are different between the two sets. So, I have some 32 responses generated from a survey which aim to measure certain variable and I want to...

Homework Statement Two blocks of equal mass are connected by a rope of negligible mass that is passed over a frictionless pulley as shown in the figure. The angle made by the horizontal plance and the ramp is 30 degrees. a) If the system is in this configuration and neither block moves what...

So I've been busting my head for the past 2 days trying to figure out what I was doing wrong and I just can't. I have a whole bunch of these types of questions and can't solve any of them. My own equations and reasoning make sense to "me" but don't lead me to the right answer. I am positive I'm...

Landau's book defines it as thermal conductivity/density/specific heat at constant pressure while Chandrasekhar's book defines it as thermal conductivity/density/specific heat at constant volume. I am confused. Any comments?

Homework Statement A car is traveling at 15.5m/s travels on a surface where μ=0.1. The driver sees a boy run into the road 125 m ahead. She immedietly applies the brakes, locking the wheel, and skids to a stop. Where will the car be when it stops? (i.e:Will it hit the boy?) I know I should...

So anytime I've seen textbooks explain integrated rate laws, they usually start with a reaction of the form A -> B and then from there say, if we know the reaction is first order with respect to [A] then: v = -d[A]/dt = k[A] And then subsequently integrate this to find ln[A]/[A]i = -kt...

Homework Statement From http://library.thinkquest.org/10796/index.html m=1300kg t=35s r=40m Homework Equations V=\frac{2\pi r}{t} a_c=\frac{V^2}{r} F_c=ma_c F_f=\mu mg F_f=F_c \mu=\frac{a_c}{g}=\frac{F_c}{mg} The Attempt at a Solution Plugging into the formulae is pretty...

What is the definition of a "coefficient" How would you define what a coefficient is in the context of differential equations? How do they influence the graph of a DE (variable and constant)? Thank you in advance

Homework Statement From http://library.thinkquest.org/10796/index.html (#6) g=9.80m/s^2 Homework Equations F=ma F_f=\mu F_N F_N=mg (The site actually states the normal force to be equal to negative mass times gravitational acceleration, but with a negative value for gravitational...

hello,everybody .Doppler coefficient will be positive?

Hi, I would like to know if somebody has the formulas to find the heat transfer coefficient while the nucleate boiling and the film boiling, for a plate heat exchanger... I really look forward reading someone. Thanks

Homework Statement A ball falls freely to the ground from a height of 5m and rises back to a height of 2.5m after the first rebounce. Find the coefficient of restitution.

A 2-m x 3-m flat plate is suspended in a room, and is subjected to air flow parallel to its surfaces along its 3-m-long side. The free stream temperature and velocity of the air are 20oC and 7m/s. the total drag force acting on the plate is measured to be 0.86N. Determine the average heat...

When we are supposed to calculate the value of "temperature coefficient of resistance " i.e. α , how are we supposed to choose between the following two formulae : α = (R2 - R1) / (R1*T2 - R2* T1 ) or α = (R2 - R1)/ [ R1 *( T2-T1) ] I have attached scanned pictures of two similar...