Coefficient Definition and 1000 Threads

Now a days i am working on this paper...

1. Homework Statement After a certain amount of running, there is likely to be changes in the values of the engineering parameters of the system in section (a). One of these is the friction coefficient, Carry out the activity with calculations to find out the effect on power transmission if...

Homework Statement A girl, with the mass m, slides down an icy slope at the time t1=τ. The slope is inclined at 30° below horizontal. The coefficient of kinetic friction between the girl and icy slope is μk. The girl notices that she can slide down the slope significantly faster if she sits on...

Homework Statement The figure shows an adjustable pipe wrench, drawn to scale. The geometry of the mechanism is arranged so that the jaws clamp more tightly as force is applied to the handle. Friction between the jaws and the pipe transfers a torque from the jaws to the pipe. Find the critical...

I am working through a past exam paper and this one has me stumped 1. Homework Statement Consider a particle of mass m with kinetic energy E incident from the left upon a step-up potential: $$U(x)=\begin{cases} 0 & \quad \text{for } x <0\\ V & \quad \text{for } x>0\\...

Homework Statement This is a theoretical question from my homework. We did a lab in class where we were using motion to see how kinetic friction is affected by different variables. We found the acceleration of a sliding wooden block (sliding on another wooded block), and then used that...

Me and a friend at school are doing an honors project for a Computer Science class. We're trying to find the aerodynamic drag coefficient of complicated 3D Shapes entirely virtual. We started out the project with a specific physics engine in mind. It turned out this engine "Bullet Physics"...

I'd like to know how to work out the drag coefficient of a sheet of cardboard. I know the formula, but to get it you need the drag force which in turn needs the drag coefficient. For reference, the cardboard is about 3mm thick and is roughly 60cm by 20cm. It has a 100g weight attached to the...

I have a question about complex reflection and transmission coefficients. For example, I am modeling a wave in air (medium 1) ## \varepsilon = \varepsilon_0 ## reflecting on, and transmitted to, a medium 2 with ## \varepsilon = \varepsilon' -j \varepsilon'' ## If the wave would have traveled...

Homework Statement I am trying to work out the Fourier coefficient a_{n} for : Mathematics is not my strong point and I would appreciate some help. The answer that wolfram spits out it lovely and neat and I am struggling to get my answer to it. Homework Equations The Attempt at a...

I need to measure the co-efficient of friction of rubber (elastomer) seal on steel. How can I do this by experimentally ? I appreciate your any kinds of help regarding this issue. Thanks in advance.

Homework Statement Homework EquationsThe Attempt at a Solution [/B] 1. A copper rod, 100 mm long and 2.5mm diameter, has a resistance of 340micro ohms at 15degrees Celsius. If the rod is drawn out into a wire of uniform diameter 0.5mm, calculate its resistance at 60 degrees Celsius. Assume the...

Just wondering, what would be the lowest coefficient of friction value we know nowadays? From what material is it? Does the temperature between two surfaces interferes on the friction coefficient value?

Hello, What shape has the lowest drag coefficient at ground level and at subsonic speeds (0-150kph) with the following dimensions? Width 60cm (at 45%) Height 120cm (at 45%) Length 220cm These dimensions will fit my motorcycle (not too narrow and not too long). I am thinking it would be a...

Homework Statement Coefficient of friction of a flat belt and of a vee belt Homework Equations I know the lap angle, m2, T2, T1/T2 and ln (T1/T2) for the flat belt and lap angle, m2, T2, T1/T2 and ln (T1/T2) The Attempt at a Solution I attempted to find it by plotting a graph using the lap...

Homework Statement So, I need to figure out the coefficient of static friction using the equation tanθ = µs ONLY. I have been given the angle 26 degrees, and a mass of 424.32g. Homework Equations tanθ = µs[/B] The Attempt at a Solution I don't know where to start...

We know that the ratio of velocity of separation to the velocity of approach of two bodies in a head on collision is called coefficient of restitution .Is there no possibility that the velocity of separation is quite larger than that of approach? or vice versa? can't the ratio be more than 1 or...

Hi, The reflection coefficient (R) of an EM wave is, as far as I know, 1 if there is total reflection and -1 if there is total reflection AND the phase changes by 180º. However, we also know that the transmission coefficient is given by T = R + 1 (or by its own formula, which should give the...

Homework Statement A team of six poodles are pulling a 14.0 kg sled at 8.0 m/s IF the dogs are applying a 66N force, find the coefficient of kinetic friction Homework Equations Ff=u*Fn Fnet=ma Fnet=(-Ff)+FaThe Attempt at a Solution I honestly have no clue where to start for this question.

Homework Statement A 2.0 kg block of wood slides over a horizontal surface and comes to rest in 2.5 s. If its initial velocity was 9.0 m/s, what is the coefficient of kinetic friction? Homework Equations rho=mv change in rho=F*change in t Force of friction = mu*Force normal Force normal=mg...

Homework Statement A particle moving with initial velocity vi = (3i + 5j) m-s−1, collides with a smooth plane wall placed at some orientation to the particle’s trajectory. The resulting velocity of the particle is vf = (−2i − j) m-s−1. The coefficient of restitution for this collision is Ans...

Can anyone explain why, if you increase the CoF of the belt on a V-Belt pulley system, you'd get less torque? I've increased my CoF in the V-Belt tension formula. You'd have thought that the torque would increase with a belt with a greater CoF?

Homework Statement This i self study! Hi, How thick should a foil made from absorber II be to give the same absoption as 1mm thick foil made from absorber I for xrays with energy 5X106 xray beam passing through an absorption material it is attenuated , this is given by I/Io e-ax io...

Homework Statement A hollow spherical shell with mass 2.50kg rolls without slipping down a slope that makes an angle of 33.0 with the horizontal. Find the minimum coefficient of friction μ needed to prevent the spherical shell from slipping as it rolls down the slope. Homework EquationsThe...

Homework Statement Problem: A 10 kg box slides down a hill and has a constant velocity. The angle of the hill is 10° with respect to the horizontal. What is the coefficient of kinetic friction between the surface of the hill and the box? Homework Equations Fn = mg + ma ƒk = μk * Fn The Attempt...

Hello, I have a swimming pool with a waterfall feature. I need to know how much does the waterfall contributes to cooling the pool. I tried to use Newton's law of cooling, but I have a problem with the Heat Transfer Coefficient in this case. Following are the Givens: Waterfall Width= 5m...

What does coefficient of retitution signify? On what factor does it depends?

Homework Statement Hello, Let's say I was given a problem where I have to calculate CD I find everything except CD Now, CD = CD0 + K CL2 I know how to calculate K but I don't know what CD0 is. Would that be a given? or do I have to find it myself? If so, how? Then there's another formula for...

This is a graph obtained during throttling process by keeping pressure and temperature at the inlet of the valve fixed and varying them at the outlet to get different isenthalpic curves for different inlet pressures and temperatures. Is it true that the sudden change in temperature of this...

Homework Statement A box has the mas 50.0Kg. The box slides on a horizontal surface that has friction. The box has the velocity 3.00m/s when its 0.600m away from a spring with negligible mass and the force coefficent 20Kn/m. The box hits the spring and comes to a momentary rest after...

Homework Statement I know incline is 16 degrees I know distance traveled is 2.85 meters I know Vf is 2.71 meters/second I calculated the meu static and got .287 Homework EquationsThe Attempt at a Solution Tried every thing so lost

I said stay the same, the definition of co efficient is here http://simple.wikipedia.org/wiki/Coefficient_of_friction but the main part i saw not only here was "The coefficient of friction is dimensionless, meaning it does not have any units. It is a...

Homework Statement [/B] (a) Find christoffel symbols and ricci tensor (b) Find the transformation to the usual flat space form ## g_{\mu v} = diag (-1,1,1,1)##. Homework EquationsThe Attempt at a Solution Part(a) [/B] I have found the metric to be ## g_{tt} = g^{tt} = -1, g_{xt} = g_{tx} =...

hi, I'm currently really struggling with an assignment that I've been tasked with. https://ss1002.files.wordpress.com/2015/01/assignment.pdf It's mostly theoretical proof questions, which I find difficult. Actual questions I'm fine with. I have done the first question without issue, as...

[Moderator note: Moved from General Physics so no template.] An object slides down an inclined plane where there is friction. The time it takes the objects to slide down the plane is 5/4 times longer than the time it takes the same objects to slide down the plane without friction. Calculate the...

Homework Statement See, I was collecting data for a lab, and now when I look it at, I'm being asked to find the kinetic friction force and the coefficient of friction. What I was given was: the mass of the block: .261 kg gravity: 9.81 m/s2 the acceleration: -7.3125 m/s2 And that's it. If it...

What is the value of linear loss coefficient in Si waveguide for light of 1550 nm?

Homework Statement The rectangle in the drawing is held by the horizontal rope and the friction on the wall. What's the minimal coefficient of friction Homework Equations Friction force: f=μN The Attempt at a Solution Moments round the point of contact with the wall. the side of the rectangle...

Homework Statement 3 cylinders of mass m and radius 0.5[m]. what is the minimum coefficient of friction between them. Homework Equations Friction: f=μN The Attempt at a Solution f, the friction force, balances the torque of the weight: $$mg\cos30^0\cdot0.5\sin30^0=\mu\cdot mg\cos30^0\cdot...

Homework Statement Consider an uni-dimensional scattering by a delta function at the origin, given by the potential ##V(x) = g \delta(x)##, with ##g>0##. Using the following result, with ##G(x)## being the green function: $$\Psi (x) = e^{ikx} + g...

Homework Statement A skier is sliding down a 20o slope at constant speed, what is the kinetic friction coefficient? Homework Equations E = 1/2 mv2 W = Fd F = ma F = μN = μmg The Attempt at a Solution Attempted to use ma = μmgsin20, which crosses out the masses since mass was not given, but...

Homework Statement The cylinder weighs 200[N] and lies on a rough surface. a rope holds it in place. What's the tension T in the rope and what's the minimal coefficient of friction. Homework Equations Friction: f=μN The Attempt at a Solution All the geometry i have drawn. T balances the...

An air-track glider of mass 0.100 kg is attached to the end of a horizontal air track by a spring with force constant 20.0 N m (Fig. 6.22a). Initially the spring is unstretched and the glider is moving at 1.50 m s to the right. It is calculated that with an air air track turned off, a glider...

Homework Statement A rod of mass M and length L is placed horizontally on a table such that the center of mass is a distance L/6 from the edge of the table (CoM is hanging off the table). The rod is released from rest and slips after reaching an angle θ. Find the coefficient of friction \mu 2...

Homework Statement Picture of Problem: Homework Equations $$\psi(x) = A_n e^{ikx} + B_n e^{-ikx}$$ for n=1,2,3 The Attempt at a Solution I know i need to relate the wave functions $$A_n e^{ikx} + B_n e^{-ikx}$$ for n=1,2,3 (the three areas of the barrier - before barrier, inside barrier...

It is always considered that the evolution of the input reflection coefficient, ρ, of a LTI causal passive system with frequency, f, always presents a local clockwise rotation when plotted in cartesian axes (Re(ρ), Im(ρ)), e.g. in a Smith chart, as shown in the attached figure. It must...

Hello everybody. I should solve a modified version of second Fick's law in nondimensional spherical coordinates; t is the time and rho [0,1] the nondimensional radius. In this equation the diffusion coefficient is vraiable with t and rho. The equation is the following: dC/dt =...

Homework Statement Flying aircraft X is designed in 2014. The current model has a top speed of 812 m/s, a mass of 72,000 kg when fully loaded, and a maximum thrust to weight ratio of 0.44. Calculate the lifting force and the drag coefficient for the Quinjet when it is flying level at top speed...

Homework Statement Just found this site ,looks really helpful , so i am doing some revision using past exam papers and have a few head scratches you guys maybe able to help with . A car of mass 1000 kg is traveling at a speed of 25 m/s when it applies its brakes suddenly. The car immediately...

Not sure if I'm getting this right, my answer seems very small, can anyone advise? Question- butanol at a temperature of 28oC is pumped at a velocity of 14ms-1 through a 100mm diameter tube kept at a wall temp of 90oC. The properties of butanol are below. Determine the convective heat...