Static Definition and 1000 Threads

Homework Statement A machine in an ice factory is capable of exerting 3.3 * 10^2 N of force to pull large blocks of ice up a slope. The blocks each weight 1.21 *10^4 N. Assuming there is no friction, what is the maximum angle that the slope can make with the horizontal if the machine is to be...

Homework Statement The first part is a donkey is pulling a cart with zero acceleration and I've found the coefficient of kinetic friction in the bearings and the wheel, and the coefficient of static friction of the donkey in the ground. Part two I'm having problems with- This time, a the...

Homework Statement A cat sits on a merry go round at a radius of 4.0m from the center. The ride makes one complete rotation every 6.3 seconds. What is the least coefficient of static friction to keep the cat in place? Homework Equations Circumference = 2Pi*r V=d/t a=v^2/r The...

A crate of oranges weighing 176 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.30 and μk = 0.20. The truck drives on a straight, level highway at a constant 6.3 m/s. a. What is the force of friction acting on...

Homework Statement An un-tethered block sits on a flatbed truck as it accelerates up an incline that makes an angle of 15° with respect to the horizontal. If the truck speeds up at a rate less than 2.10 m/s2, the block remains on the truck. If the truck speeds up at a rate equal to or greater...

A simple question, but I can't find the answer anywhere :redface: … when something (otherwise unconstrained) is pulled by rope (approximately forwards) so as to slide (not roll) at constant speed in a circle on a rough surface, the total acceleration is obviously centripetal (radial) there...

what is a the difference between a static and a dynamic impact?

Homework Statement In the figure a fastidious worker pushes directly along the handle of a mop with a force F. (Note: For picture, imagine a worker standing in the second quadrant pushing the mop head into the origin) The handle is at an angle θ = 23.58° with the vertical, and 0.30 and 0.22...

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 us and P is directed at angle theta below the horizontal, show that the minimum value of P that will move the crate is given by P = ( us*Fg*sec(theta)) / (1...

BRS: Static Axisymmetric "Gravitationless" Massless Scalar Field Solutions This thread is an (easy and amusing) companion to a previous BRS, "The Weyl Vacuums" www.physicsforums.com/showthread.php?t=378662 I. The Family of "Gravitationless" Solutions I will describe a family of...

Hi I have some questions to go through for static equilibrium...I have the answers but I have no idea how to do these really - I am guessing most of them without really understanding I can't remember doing physics in shcool at all and since its been the best part of 20 years since school...

Homework Statement Suppose the coefficient of static friction between the road and the tires on a car is .60 and the car has no negative lift. What speed will put the car on the verge of sliding as it rounds a level curve 30.5m in radius. Homework Equations A=V^2/R F=MV^2/R The...

What is the difference between static attraction or repelling, compared to magnetic. I understand the princips of static build up and why a charged positive and charged negative attract each other. I also understand how the atoms are arranged in a "metal-magnet". But why can't you attract a...

Homework Statement The bar is in static equilibrium W = 15N, Na = 11N and Nb which is perpendicular to the bar,Nb = 5.66N.What is the magnitude of tension forceT? Homework Equations The Attempt at a Solution W - Na - Nb*sin(theta) = 0; 15 - 11 - 5.66*sin(theta) = 0 theta = 45 deg...

Homework Statement The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.25 with the floor. If the train is initially moving at a speed of 48 km/h, in how short a distance can the train be stopped at constant acceleration without causing the...

Alright, everyone, I have some questions in regards friction when rounding a flat curve and was hoping to get some help with it. For that intent, I've borrowed a couple of posts from another old thread on the topic of centripetal force. Hope the authors don't mind. The textbook I'm using...

Homework Statement The three identical boxes shown in the figure remain at rest on a rough, horizontal surface, even though they are acted on by two different forces, F1 and F2. All of the forces labeled F1 have the same magnitude; all of the forces labeled F2are identical to one another...

Homework Statement A window cleaner uses a ladder of length L and weighs 200N. He places it agaisnt a wall where, at the point of contact the coefficient of static friction, \mu, is 0.4. Upon the ground is 0.6. The window cleaner has a mass of 80kg and is 0.8 of the way up the ladder when...

Hello, How is a static magnetic or electric field understood in terms of QED. Is it correct to interpret them as a collection of photons? If so, would these photons be real or virtual? Thanks in advance.

I’ve been reading about airfoil lift and have found it rather difficult to find an answer to this question. Is the lift generated by an airfoil primarily dependent on accelerating static air gas particles down?

I am trying to figure out how to program a 528 hz signal to emit and amplify through a copper wire coil

If I have a beam tilted at an angle with a weight hagning off of one end and it is fixed on the other (see attachment), my teacher says that I need to resolve the force to find the force in the beam. However, it does not make sense to me that the force in the beam increases as the angle...

max \mus is always larger than \muk. i think it's proven experimentally, but why exactly is this so?

Homework Statement Block A, with mass mA, is initially at rest on a horizontal floor. Block B, with mass mB, is initially at rest on the horizontal top surface of A. The coefficient of static friction between the two blocks is μs. Block A is pulled with a horizontal force. It begins to slide...

1. Two people of equal mass are holding opposite ends of a rope and lean back 15 degrees with the vertical. What is the tension in the rope exerted by each person? This is how attempted to solve this. So tension is created by the force of gravity from them leaning back. So I drew a force...

I've been reading about static electricity, and I'm starting to get a handle on how it works. I have a big question; static electricity always seems to make things stick and what not, but is there such thing as static electricity repulsing?

Hey just wanted to know the theory behind this. If i have a open reservoir say 20 ft above a pump and i want to pump the water that flowing down on the suction side to a reservoir on the discharge side 80 ft above, the static pressure from the suction reservoir should decrease the pumps work,but...

The intensity of radiative fields or radiating fields (from accelerating charges, or AC current in a circuit) falls off with the inverse square dependence. Electric fields from point charges fall off with inverse square dependence because we have single pole charges. There are no monopoles...

I'm a bit confused about magnetism and electromagnetic induction. On the one hand I understand that to induce a current we need a change in magnetic flux. On the other... a charge moving relative to an external magnetic field experiences a force. If the field is uniform then we would...

Homework Statement 1. Rod A has negative charge and is used to induct rod B. Rod C then charged by touching it with B. The charge on C is… a. Neutral b. Positive c. Negative d. Undetermined2. a. Plastic comb that we hold can be charged by rubbing. Why a copper can’t be charged when we are...

Static Problem...i am confused Homework Statement The Problem says " A rod is 5 ft long and its weight is 60 lb. one end of the rod is fastened to a vertical wall by a clip. other end is bound by a rop which is attached to point on the vertical wall situated at a 12 ft height from the clip...

Hi, I place an object on a rough surface. It is clear that the static friction will increase as you increase the elevation of the surface since there is a bigger component of weight acting down the plane surface. But will the max static friction -i.e. friction at the verge of slipping...

Homework Statement 1.a ball is attracted to both positive and negative charge. state whether the ball has negative, positive, or no charge 2.why does electroscope use gold for the "leaf"?can others metal be used? 3.http://www.sciencebyjones.com/induction.gif i do not understand that...

Hi all, My job is to simulate the practical testing procedures into software and check the results of the model before prototype. To do this we assign the physical properties of the material say YOUNG'S MODULUS, POISSON'S RATIO and DENSITY. Through these properties the software recognises...

when you take 2 phone books , and inter-lay them page by page , so it makes them hard to pull apart . is this because it is like sliding a block of wood on a table just now you have like 1000 surfaces sliding on each other , is that what is going on .

Homework Statement One end of a uniform 4.00m long rod of weight Fg is supported by a cable. The cable is attached to the bar at an angle of 37.0o. The other end of the bar rests against the wall where its held by friction. The coefficient of static friction between the wall and the rod is...

A light spring has a mass of 0.20 kg suspended from its lower end. A second mass of 0.10 kg is suspended from the first by a thread. The arrangement is allowed to come into static equilibrium and then is burned through. At this instant, what is the upward acceleration of the 0.20 kg mass. ( take...

Homework Statement A 100kg box is placed on a ramp. As part of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 15 degrees. What is the coefficient of static friction between the box and the ramp? Homework Equations Fn = mg-Fsin15 The...

Hello all, I am confused with naming of the Zeeman effect (in nuclear or/and electronic levels). Is that means: 1. splitting of spectral lines due to internal magnetic field, or 2. splitting of spectral lines due to external magnetic field, or 3. splitting of spectral lines due to...

Homework Statement Assume that the driver begins to brake the car when the distance to the wall is d=107m, and take the car's mass as m-1400kg, its initial speed as vo= 35m/s and the static coefficient to be .50. Assume that the car's weight is distributed evenly on the four wheels, even...

Homework Statement Need to calculate the error of coefficient of static friction in a lab where: µs = tan(theta)s They say to use the general theory of errors? Homework Equations delta[tan(theta)] = [1/cos(theta)]^2 (delta)(theta) The Attempt at a Solution Do I just plug in my...

Hello all. I'm not a regular from the forum or nothing, I've been looking for a solution for a problem with static noise in a speaker system and got to this post in the forum https://www.physicsforums.com/showthread.php?t=201439 is not what i was looking for but from what i read someone...

Homework Statement I was just wondering if someone could help explain this problem I've been having. A lot of textbooks I've been studying from are describing how two insulators can become charged, but then don't mention whether an insulator can be earthed - it only mentions "charged...

I was out in the shop earlier, and came back inside the house, noticed my watch fast a few hours. Did a search to find out what kinds of things cause this, and found that it was probably the magnets/electrical fields from the power tools I was using. Also came across a lot of people...

Homework Statement The attached system is in static equilibrium, and the string in the middle is exactly horizontal. Find: a)tension T1 b)tension T2 c)tension T3 d)angle theta Homework Equations I know I need to create equations that equal zero to analyze the x and y components of...

Homework Statement There is a 40 Newton beam being held by a rope. The rope is attached at the top of the beam and the ground making a 25 degree angle at the top of the beam. There is a force applied to the beam with 200 Newtons in the positive x direction. Find the tension and static...

A car, traveling at speed v, can safely negotiate an unbanked curve with a 50.0-m radius when the coefficient of friction between the tires and the road is 0.8. How much bank would a curve with the same radius require if the car is to safely go around it at the same speed, v, without relying on...

Homework Statement Calculate the depth h of mud for which the 3m concrete retaining wall is on the verge of tipping about its forward edge A. The density of mud may be taken to be 1760 kg/m3 and that of concrete to be 2400 kg/m3 The Attempt at a Solution So I made A actually at 1.5m down...

Hello. I'm interested intaking a cloud formed of activated carbon particles and particulates of some other substance to produce static electricity similar to that formed in a cumulonimbus cloud. The means of containing this experiment is another matter. I understand that when "opposite...

For a personal project, I am analysing the physics in the Source video game engine and comparing it with real life. I have set up in the engine a platform which increases in inclination from 0 to around 70 degrees. On this platform there are four, equally weighted cubes each with a...