Static Definition and 1000 Threads

I remember doing an experiment in Physics class to find the coefficient of friction with gravity. We set an object with a flat surface on top of a ramp, and adjusted the ramp angle so that the object would move down the ramp at a constant velocity. Then we measured the angle of that ramp to find...

Homework Statement Two children of masses 45 kg and 30 kg are playing on a teeter-totter of length 4.0m and mass 30.0kg, pivoted at its centre. The heavier child sits 1.75 m from the centre of the teeter-totter that is 0.50 m from the ground. a) What torque does the teeter-totter apply to each...

Homework Statement When you push a 1.55 kg book resting on a tabletop it takes 2.50 N to start the book sliding. Once it is sliding, however, it takes only 1.50 N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction between the book and the...

Homework Statement Member ABD is supported by a pin at A and a pin in a smooth slot at B. Member BC serves as a support post. A 100 N force is applied at D. Determine the reactions at A and B necessary for equilibrium of ABD. The Attempt at a Solution Ma = 0 = (.5)(Fb) - (1)(83.74) Fb...

Referring to following image, static energy is generated, do we detect any magnetic field around this area? If we only get pure positive or negative charge on stable object, will it generate any magnetic field? On the other hands, is there any digital device to measure the strength of static...

Below are six crates at rest on level surfaces. The crates have different masses and the frictional coefficients [the first value is the static friction and the second is the kinetic friction] between the crates and the surfaces differ. The same external force is applied to each crate, but none...

Need to calculate motor size to drive skip dolley system. have the following: Frame on 6 wheels. Gearbox/motor driving middle pair of wheels. Total mass 12t Need to move trolley @ 5m/min Any thoughts where to begin?

Homework Statement To move a large crate across a rough floor, you push on it with a force F at an angle of 21° below the horizontal, as shown in the figure. Find the force necessary to start the crate moving, given that the mass of the crate is m = 37 kg and the coefficient of static friction...

Calculation of plasma frequency and static dielectric constant (urgent) Hello: Can anyone tell me how to measure the plasa frequency of a metal and wherher energy band gap of a metal is equal to the plasma energy of that material which is equal to (plank constant * plasma angular...

Hello: I want to calculate the plasma frequency of Au, Ag, Cu and Al. But wondering what is the most precise way to calculate the plasma frequency.If anyone can help me with that it will be really appreciated. I know that Plasma Energy = √(n*e^2/(m*ε°)) = plank constant * ωp Here...

Homework Statement A ladder is made in the shape of the letter A. Treat the two sides of the ladder as identical uniform rods, each weighing 455 N, with a length of 3.60 m. A frictionless hinge connects the two ends at the top, and a horizontal wire, 1.20 m long, connects them at a distance...

Homework Statement A box of textbooks of mass 24.6 kg rests on a loading ramp that makes an angle theta with the horizontal. The coefficient of kinetic friction is 0.23 and the coefficient of static friction is 0.35. A. As the angle theta is increased, find the minimum angle at which the...

Homework Statement Two sticks are connected, with hinges, to each other and to a wall. The bottom stick is horizontal and has length L, and the sticks make an angle of θ with each other, as shown in Fig. 2.38. If both sticks have the same mass per unit length, ρ, find the horizontal and...

Hi! I have Windows 7 installed on my laptop. At home we have a wireless router, which in order to work, requires me to put in static IP addresses and DNS servers in the network connection's TCP/IP settings. In my university, in order for the internet to work, I have to tell the computer to...

When a car is moving on a circular track which is sloped away from the centre of the track, is the static friction keep that car on the circle (constant speed) towards the outside of the circle, opposite the acceleration? I'm having trouble seeing this because to me, the car would want to...

Homework Statement A 12g coin slides upward on a surface that is inclined at an angle of 14degrees above the horizontal. The coefficient of kinetic friction between the coin and the surface is 0.25; the coefficient of static friction is 0.40. Find the magnitude of the force of friction when...

The other day, we were discussing cars going through turns and the max speed they could do without slipping. My teacher asked us if static or kinetic friction should be used. I answered static, because the wheels are rotating and thus not sliding over the road surface. He ended up saying the...

I was tasked with redesigning our system to hydrostatically test valves. I had to incorporate a drip test downstream of the valve that would be the determining factor whether the valve was leaking or not. The system I came up with has 3/8" ID tubing (app. 10 ft) running from the downstream of...

Homework Statement See Picture: I am only stuck on Part (c) where it asks to calculate the force as the bookcase starts to tip. Homework Equations sigma Fx=0, sigma Fy=0, sigma tau=0 The Attempt at a Solution I am setting up the problem by picking an axis that runs through the...

Homework Statement A backpack full of books weighing 54.3N rests on a table in a physics laboratory classroom. A spring with a force constant of 200N/m is attached to the backpack and pulled horizontally, as indicated in the figure. If the spring is pulled until it stretches 1.50cm and the...

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...

Hii guys :smile: here something tricky, have a go on this one... I am required to model the human body so that I can analyse the static loads, (comparing the pilates position and the abdominal sit-up position) (pictures...

This question requires you to model the human body so that you can analyse the static loads, (comparing the pilates position and the abdominal sit-up position, figure above) Using the body mass ‘M’ of 94 kg and a body height ‘h’ of 1.73 metres, establish which exercise requires the most effort...

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?

Hi! I am having a tough time with this question, and would just like some clarification if that's at all possible! I feel I may just be missing a key concept, however, any help is appreciated! Thanks. Homework Statement Point x is .25 m away from a point charge of +4.7*10^-8 C, point Y is...

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?