Static Definition and 1000 Threads

A 5.00-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.600. What is the maximum horizontal force that can be applied before the 5.00-kg block begins to slip relative to the 12.0-kg block, if the force...

Been working on this problem http://www.flickr.com/photos/archiphoto77/6179533925 (SEE LINK FOR PHOTO OF PROBLEM) for quite some time now, and the components don't quite add up for me so I am just a tad exasperated... In the x-z projection, I see two forces acting along the x-axis---one...

Block 1 as shown in the link below(url) has a mass of 10.3 kg. The coefficient of static friction between the block and the table is μs = 0.36 and the coefficient of kinetic friction is μk = 0.336. a) What should the mass of the second block be so that m1 is just on the verge of sliding? I...

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A cart (with wheels) sits on a horizontal table. The front of the cart is a vertical wall, with mass M = 0.313 kg held against the wall. You want to push the cart forward with an acceleration of magnitude a so the mass M can be released and it will not slide down the wall. Assume the coefficient...

Homework Statement The coefficent of static friction between the floor of a truck and a box resting on it is 0.36. The truck is traveling at 70.0 km/hr. What is the least distance in which the truck can stop and ensure that the box does not slide? Professor gave us these clues: It is...

Homework Statement Hi I'm having trouble solving this physics problem if anyone can help it would be greatly appreciated ! Static pressure problem: A bathtub contains water to a depth of 20 inches. Determine the pressure at the bottom of the bathtub in both [psia] and [psig] (a being...

Homework Statement Hi I'm having trouble solving this physics problem if anyone can help it would be greatly appreciated ! Static pressure problem: A bathtub contains water to a depth of 20 inches. Determine the pressure at the bottom of the bathtub in both [psia] and [psig] (a being...

Homework Statement Find H as a function of L and XHomework Equations http://imageshack.us/photo/my-images/28/project1questoin.png/ http://imageshack.us/photo/my-images/28/project1questoin.png/ The Attempt at a Solution my answer came out to a ridiculous solution and I am not really sure if it...

Homework Statement "If the coefficient of static friction between the block of mass m and the turntable is \mu_s, determine the maximum constant angular velocity of the platform without causing the block to slip." I'm actually using this problem to understand why I'm getting the wrong answer...

Homework Statement " The result of an imbalance of this "fluid" (electrons) between objects is called static electricity. It is called "static" because the displaced electrons tend to remain stationary after being moved from one insulating material to another." Homework Equations...

I have a problem that is costing me lots of $'s. I built a pole barn seven years ago that is about 50 feet from my house and garage. I am on my third garage door opener due to logic boards being destroyed by static electricity. I have had a second electrician check out my wiring and he says...

Had our observations shown shown that the Universe was not expanding, and was instead static, where would that have lead us as far as Cosmology is concerned?

Homework Statement There are 2 parallelepiped with dimension x,l,h those were united to create a bigger solid with an "L" form ( see the picture ). The solid is isolated and full of water. What's the force that must be done against the top wall, to make the system in equilibrium? Here's...

I've been thinking recently that for static systems (it won't work in general), you can treat gravity as being a two-form if you use the scaled "force at infinity" rather than the locally measured gravitational force. The "local force of gravity" is the acceleration of a worldline of a...

i want to know the relation between thrust/rpm. what is the formula to calculate it?

I want to make a quad rotor UAV. i studied a lot but i did not find how static thrust is being calculated. In physics forum i have found an equation which is given below but i can not understand what is 'frac' and 'rho'. Equation is: T=\frac{c_T}{c_p}\frac{P}{nD} Where: P = power (ft-lb/s...

I've heard that the prevailing theory of cosmology before the Big Bang was that the universe is static and eternal. If this is true then how did they reconcile that theory with the second law of thermodynamics? Thank you...

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...

I'm a programmer and I've been working on a simulation that involves some physics. Part of my simulation involves two 3D spheres colliding where each sphere has its own mass and velocity. I already found code that handles that and applies conservation of momentum to get the new resulting...

Hi, everyone I'm now reading A Relativist's Toolkit by Eric Poisson. In chapter 3, he say something about stationary and static spacetime. For static spacetime, it's just like stationary (admits timelike Killing vector t^{\alpha} ) with addition that metric should be invariant under...

Homework Statement Consider a boundary between two dielectric media with dielectric constants \epsilon1 and \epsilon2 respectively. The boundary carries a surface charge density \sigma. Use appropriate integral forms of Maxwell equations and an illustrative sketch to derive continuity...

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...

I am and have been trying to do a specific simulation for the last several weeks. It seems like I take one step forward two steps back. See below: See the attached files. I'm on Ansys Workbench 13. [PLAIN]www.plastics-consulting.com/rod.stp[/URL]...

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

I've asked a similar question before in some way or another, I'm still troubled by it. Technically there is no such thing as a static electric field: Take for instance a parallel plate capacitor Argument #1: Electrons are always moving inside the conductor, they have a finite thermal energy...

Hi, I have a question about the static gauge in string theory, in which one sets \tau = X^0 I understand that in the usual approach for strings in a flat target space, after the gauge fixing of the worldsheet metric gamma, \gamma_{\alpha\beta} = \eta_{\alpha\beta} one...

Homework Statement What is the upward force required to make pipe start to move? There is a fixed point and a 36 inch shaft. The force would be applied 36 inches away to the point. The load is 1700lbs. The end point only needs to come up enough so that the static friction of the pipe is...

Anybody know where I can find data on normal street-tire friction coefficients on dry asphalt? I'd like both the static, and the kinetic coefficients. If not, can somebody give me a range of reasonable values? While I'm at it... What about racing slicks on asphalt? I found one source...

hi, this is the first time i am using this website and have found it very informative ao far.. so i am working on this assignment and have got stuck on this question. the query is .. why does static pressure vary on the surface of vehicles and how does it affect the aerodynamic...

Static moment VS Moment of inertia -- what's the difference? What's the difference between moment of inertia and static moment? How does it differ in calculations?

I can use Noether's theorem and the homogeneity of time to derive the conservation of energy for a static E field, but can I also use the homogeneity of space to derive the conservation of momentum?

Why doesn't static electricity cause ionic bonding,since some atoms become positively charged and others are negatively charged ?

Hi, I'm new here. This question may already have an answer but I didn't find it. Sorry if there's already one. It's a static version of the twin paradox, without travel and without twins. We have 2 circles C and C' that are superposed. C is fixed, with time t and co-ordinate x along the circle...

Homework Statement http://img849.imageshack.us/img849/3716/staticeqpulley.jpg Hopefully the image showed up. If not, here's the link: [PLAIN]http://img707.imageshack.us/img707/3716/staticeqpulley.jpg" Sorry for the low quality pictures. Hopefully it will do though. The question is: Relate...

Can someone give me an example of a case where kinetic force would be greater than static force? Thanks.

Homework Statement i tried to compute the electrostatic field of a charged ring at a point not in the center i have problem with transforming from xy to polar system what do you think about this try? Homework Equations The Attempt at a Solution

i want to design a machine which is capable of applying all three types of loads that is axial, bending and torsion. Using this application of static loads , I want to measure the stress concentration factor.

Scenario: If a human body is fully charged with positive electrons (protons/lack of electrons) and comes in contact with a pool of positive electrons such as a charged plate, the charge stays the same in the human body and the plate. Now if the human comes in contact with a source of negative...

Homework Statement We have triangle with sides d1,d2,l and angle \alpha between d1 and d2. Assume small change \Delta\alpha of \alpha. Homework Equations Then we can write for \Deltal equation \Deltal=(d1*d2)/(l) * sin\alpha\Delta\alpha. How can I prove that? The Attempt at a...

Homework Statement Mountaineers often use a rope to lower themselves down the face of a cliff (this is called rappelling). They do this with their body nearly horizontal and their feet pushing against the cliff (the figure ). Suppose that an 76.2 kg climber, who is 1.88 m tall and has a center...

Homework Statement A solid metal sphere of radius 'a' is concentric with a hollow metal sphere of inner radius '2a'. The space between the spheres is filled with a dielectric material of relative permittivity 'ε' carrying a uniform static charge density 'ρ0'. The charge density is zero...

Why can't a static spacetime have an ergosphere? An ergoregion is just a region outside the event horizon where k can become negative (k being a Killing vector field that is timelike near infinity). Both stationary and static spacetimes have such a KVF so surely static spacetimes could also...

Can I express "stationary spacetime" and "static spacetime" in this way? Can I express "stationary spacetime" and "static spacetime" in this way? stationary spacetime: if we arrange a set of observers locating in any places, then each of them should observe nothing change at the place where...

I have some problems using this definition, maybe because it's not valid in every coordinate system: T^{\mu\nu} = (\epsilon + p) \frac{dx^{\mu}}{ds} \frac{dx^{\nu}}{ds} -p g^{\mu\nu} since in cylindrical coordinates x^0 =t \qquad x^1 =\rho \qquad x^2 = \phi \qquad x^3 =z using weyl metric...

Hey, I have a question in how one can calculate the static dielectric constant, f, of NaCl. NaCl has density of 2170kg/m3, a lattice constant a= 5.6 A and a Young's modulus Y = 40GPa. the optical dielctric costant is 2.34. I couldn't find any formulas which connect these values together. We...

Hi, I would like to model static buildup and discharge. It will be appreciated if someone can point to me a direction. Thanks! Pei-Ying

Homework Statement During an earthquake, a floor oscillates horizontally in approximately simple harmonic motion. Assume it oscillates at a single frequency with a period of 0.84 s. After the earthquake, you are in charge of examining the video of the floor motion and discover that a box on...