Movement Definition and 617 Threads

I have a problem in analyzing movement with friction involved. I do not know how to correctly analyze systems as such and what is the correct view. I have tried to answer the several question below. I have the following diagram. There is friction between all parts. 1) What force do we need to...

Hello all, I'm planning to do a research about stilts movement. I chose it because stilt is a traditional game in my country. In my plan, i want to analyze the velocity of the walker, the frequency of stilts, and the length of steps. I need some other idea to be added to my research. Such as the...

Well, the problem says: From some height a object with mass m is thrown . Determinate the law that describes how the velocity of fall v changes, if on the object, besides gravity, acts the force air resistance, which is proportional to velocity v (the proportionality coefficient is k), ie must...

Hello. I am an occasional poster here with little background but a big interest in the mental experiments (ME) of Einstein and others. Of particular interest to me are factors related to what I call the Classic Spaceship Mental Experiment. [mentor's note: a link to an unacceptable reference...

Is this an interesting problem what do you think? A cart consists of a massless platform and two wheels. Each wheel is a disk of mass M. The cart stands on a horizontal road and a man of mass m stands upon the platform. Then the man started to go along the cart and after passing the distance L...

What happens when you apply power to a toroidal solenoid with a iron ring inside? Does the ring move? Does the speed of movement depend on the amount of power? Sorry if this is too easy, I have no education in physic.

Let's say I want to determine what will happen during a chemical reaction. My current reasoning is that the electrons will be more likely to move from a less electronegative atom first. For instance, cesium is much more reactive than potassium, because its electronegativity is much lower...

This is not a normal problem help topic. The difficulty I've encountered is in understanding an alternative solution. 1. Homework Statement In a real conductor, electrons (with mass m), conducted by external electric fields, constantly collide with defects and impurities within the conductor...

Hello, I was just wondering why is there an energy loss in helicoidal movement, specially in syncrotons. I know that there is energy loss because there is a production of X-rays, why this happens?

Homework Statement An electron has an initial velocity of 5.00 x 10^6 m/s in a uniform 2.00 x 10^5 N/C strength electric field. The field accelerates the electron in the direction opposite to its initial velocity. (a) What is the direction of the electric field? (b) How far does the electron...

From the perspective of someone at or near the exact north pole (where, for all practical purposes, they are not rotating), ignoring the gradual change of the stars as the Earth orbits the sun, would the stars appear to move at all in the night sky? Or would they be stationary because the...

Someone please help me understand this concept that has always confused me: Is the movement of the turbine itself a loss of efficiency since that is energy that is not being converted into other (e.g., electrical) energy? For example, if a wind turbine is not hooked up to anything, it will...

I am having trouble calculating if two objects with initial positions and velocity vectors will come within a given distance of one another and if so calculating where the closest approach is. Can anyone point me in the right direction? My initial thoughts are that both are linear functions...

Hi, So apparently electrons don't orbit the nucleus of atoms so I'm assuming the lack of movement means that no energy from the atom is radiated away from an atom due to minuscule gravitational waves, over the life of the universe. But gravitational waves have got me thinking about reference...

How is it possible to compensate for LIGO's movement in the recent measurement of Gravitational Waves? I can understand that we are able to measure something to a tiny fraction of a proton when the subject and observer are both moving relative to each other through space but how is it possible...

Homework Statement Alright, this problem has been driving me into a confused rage. The wave is moving in an upward direction so particle A should be moving up as well, right? But every single website I've used to study claims that it's moving in a downward direction. How? Homework...

Hey guys, I have been wondering about this for a long time, and I can't seem to reach a solid conclusion. If temperature of an object is related to the movement of its atoms, then is it true to say that a moving object have a higher temperature?

Hi , i would really like to have closure on a phenomenon i saw few years ago and still cannot explain. I myself is a science enthusiast and been studying. Ok, here it is : Created a rough animation of what i saw : View was much wider. Animation is made to reflect what i saw. Star is made...

Homework Statement Hi, I've been tasked with showing that the length of vector F_gravity is inversely proportional with radius squared (i.e. |F_vector|=c/r^2) and is central, i.e. consistently directed toward the same point. Apparently, this is the same as (<=>) the acceleration of a particle...

Homework Statement New to physics forum, so please forgive me if I am posting this in the wrong place, but it seems to me that this is a homework-type or basic physics question. Here it is: You have a perfect cube with substantial mass sitting on a flat frictionless surface. The surface plane...

Hello all! Recently I watched a TV Series episode, but I didn't catch it from the beginning and I need some help to find which one was it, or any clue about it. The part that I want is about the Scientist guy explaining that things on the observable universe (big picture) seems to be moving...

Hey Everyone, I want to build a Laser cutter for myself from scratch (sort of). I need some way of turning the rotational energy of the servo into a linear movement. I want something fairly cheap, so nothing to pricey. I thought of the classic Lego style thing, with a gear on the servo, with a...

Homework Statement Although F is more than Fs , the object still wouldn't slide down due to 100N is still greater than 80 N ...Why the book gave that the obejct will start to slide down ? Homework EquationsThe Attempt at a Solution

When a car moves forward, the wheel turns it exerts a force on the road in the opposite direction of travel, and friction counter acts it. the wheel turns and the car moves forward This implies that friction on the wheel is acting in the direction of the car moving. Though I thought that...

Homework Statement A block is projected up a 30° slope at 4m/s. When it is moving the coefficient of friction is 0.3. When the block is stationary the maximum coefficient of friction is 0.5. a. Calculate how far up the block will go. b. Show that the block will not remain there. c. Calculate...

Hi, I am confused about the difference (if there is any?) between the movement of oxygen ions and oxygen vacancies inside the solid oxides. In some literature I find they are taking about the movement of negatively charged oxygen ions inside the metal oxides, while in some other cases it is...

1. Homework Statement Given the following diagram of a finite potential well, calculate the rate at which the right-going wave is bringing probability density up to the barrier. (Ignore interference with the left-going wave. ) (Hint: you can get the velocity from the energy, and the average...

Homework Statement A ball is thrown vertically upwards and caught by the thrower on its return. Sketch a graph of velocity (taking the upward direction as positive) against time for he whole of its motion, neglecting air resistance. How, from such a graph, would you obtain an estimate of the...

Homework Statement A particle with a mass of 1.5×10−5kg and a charge of +2.9 μC is released in a (parallel plate) uniform horizontal electric field of 11 N/C . How far horizontally does the particle travel in 0.40 s ? Homework Equations I think some of the kinematic equations are needed, but...

Homework Statement A particle moves with velocity ##v## along the cardioid ##r=k(1+cos\theta)##. Find ##\vec{r''}\cdot \hat{r}## and interpret the result. At what angles will this coincide with the centripetal acceleration? Homework EquationsThe Attempt at a Solution To find ##\vec{r''}\cdot...

http://www.eurekalert.org/pub_releases/2015-08/bc-g-081915.php If a bunch of morons wants to believe that evolution is a myth then there is not all that much harm done. vaccine and global warming denial are more problematic, but nothing comes close to interfering with the science it's going to...

Homework Statement Alexander sled down a hill and on a snow-covered horizontal leveled ground. He wanted to calculate the highest velocity that the sled can reach. The hill is 3 meters high and 6 meters long. When Alexander sled down the hill he traveled 12,5 meters on the snow-covered ground...

Hello, 1. I read here and here that in the hydrogen atom, electrons move at approximately ~1/137c. In the first link they speak of "zipping around the nucleus", presumably figuratively, because it is often stressed that QM has superseded the earlier model of electrons flying around. Instead we...

Homework Statement A crate on a rough horizontal floor is being moved horizontally by a force applied at a 16 degree angle above the horizontal. This is the smallest force that will move the crate at constant speed. What is the coefficient of kinetic friction? A : .11B : .27 C ...

I'm new to the forums and unfortunately I have a pretty dumb question... So in isolated system internal forces cancel each other out every single time,like pushing on a door of your car does not create any motion of your car at all. You basically can't pull yourself up by the bootstraps. I...

Hello everybody, I have a new thread to post,it is very important to find a solution for this : -Imagine a box full of air particles.The particles are forced to move to a point A on the edge of the box.My question is now,how can I mathematicly describe the movement of these particles toward...

I want to know the various mechanisms for up and down movement of a monitor inside the slot of a table. This is used in the training or conference rooms wherein when the monitor has to go down when not in use inside the slot to the bottom of the table and come up by pushing or actuating with any...

hello, I have a car robot with 2 motors which follows a black line. I want to save the track which the car follows. I can get the speed of each motor every. I thought about saving the 2 motor speeds every 100msec and then figure from this the track. Any ideas how I can do it?

Homework Statement Imagine that you are flying on an airliner on a long flight to Europe at a constant speed of 300 m/s a) you throw a ball towards the back of the plane at 20 m/s. You then shine a beam of light towards the back of the plane. How will these two things i) the ball and ii) the...

I'm trying to find the resulting location of a point on a sphere in spherical coordinates or Cartesian. Based on velocities from the perspective of an object on the sphere. So given the: location on the sphere (in spherical or Cartesian) zy - plane rotation of the point up direction of the...

Hi A steel plate with dimensions a * b and thickness t is moving in a magnetic field of stationary permanent magnet. the movement of steel plate is parallel to the magnet field. One pole of the magnet is perpendicular to the axis of steel movement. what force will be required to move this steel...

Can someone please give a step by step explanation of an orbital rendezvous by a spacecraft for a target that is orbiting the body it launched from? And if possible, can you explain how mission control is involved and what part computers play? When the RCS is active is it changing the...

I am confused about Relative Motion.Lets suppose we have one train and two observer.One of them inside the train and the other one is outside.Lets think the outside observer see the train moves a constant velocity v.The observer in the train will be think it is not moving cause of Galileo...

1. Homework Statement Consider the given system. It is obvious that the weight of the block will lead the system to move in the leftward direction. But the reason for that is not clear to me. Homework Equations Using the FBD of the block(B): ##mg-T=ma## where ##a## is assumed its downward...

Hello! What would be the theoretical properties of a particle, that moves perpetually and infinitely inside an object, bouncing from side to side inside the object walls, hardly being objected to collisions with other particles and which changes its path of movement inside the object, only when...

hello! I think Bernoulli's equation it's just an equation of conservation of energy. Am I right? but I don't understand how to apply the conservation of energy principle exactly. can you help me please? I get it that if the fluid moves, it has kinetic energy which is 1/2mV^2. I also get...

Question: If there were only a single elementary particle in the entire universe - could it move, and if so, how would its movement be measured?

A proton initially moves left to right along the x-axis at a speed of 2 x 10^3 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.15m before coming to rest. What acceleration magnitude does the proton experience? equations E = kq/r^2...

This situation got me confused, this is not a physical setup just a thought.There is a loop of wire , I have that wire on a rotor that I can rotate, I now start to rotate the wire and at the same time attach a current source to the loop like a small battery, current now flows through the wire...

Hello, and thank you in advance. My friend is a glassblower, and I am a woodworker. He makes lovely ballerina pendants, and I had thought it would be nice to set one in a display that let the ballerina spin around. (point of contact being her pointed toe) I mulled the idea over long enough...