Movement Definition and 617 Threads

Hey can we see time as a dimention where we are constantly moving about at the same speed (in our environment) ? like Earth which is in movement in the 3 space dimentions (or maybe two , depends on the axis ?) and that in some areas we move in time at a different rate (but very very...

What is the fastest movement that larger scale human muscles (vs. cells) can make?

Hey all this question appeared on my last assignment that was due on friday and had me completely stumped for the entire week and well still does, i couldn't even get off the ground (im not very good with these algebra questions) . anyway in the interests to doing my very best on my midterm exam...

Homework Statement A 61.0 cm diameter cyclotron uses a 500 V oscillating potential difference between the dees. The magnetic field strength is 0.790 ? How many revolutions would a proton make before leaving the cyclotron? Homework Equations v/r=Bq/m Ke=1/2mv^2 The Attempt at a...

What is the effect (if any) of the sun's movement around the galactic center in relation to planetary orbits?

consider a pulse traveling down a stretched rope. what makes the pulse to travel in a particular direction (let say to the right) and not the other?

Homework Statement A rifle, in which the initial velocity of the bullet is 460m/s, is aimed at a small target 800 metres away at the same height as the rifle. At what angle above the ground must the rifle be pointed so that it hits the target? ** x = horizontal distance t = time Vx =...

Amtrak's high speed train, the Acela, utilizes tilt of the cars when negotiating curves. The angle of tilt is adjusted so that the main force exerted on the passengers, to provide the centripetal acceleration, is the normal force. The passengers experience less friction force against the seat...

This is a problem was thinking about. If I have a capacitor and fill it with a dialectric of some dialectric constant (the dialectric fits perfectly and is mounted via a frictionless bearing so it can move freely). How fast does it move?

Homework Statement Two electrons are 10-9m Apart when they are released.What is their speed when they are 10-8m apart? Homework Equations Ek=-EE EE=Kq1q2 ------- r The Attempt at a Solution Ive tried 1/2mv^=-(Ke(squared) - Ke(squared)...

I have just jumped up in air and when my feet hit the ground my body is weightless for a couple of seconds isn't it? Is this why when in tennis that when you do a split step that you can move so fast in ether direction because you are weightless when your feet touch the ground?

01. Can a star be moving faster than what Doppler effect calculations indicate? This was a discussion question I heard but I'm not sure I understand. Can anyone provide any sort of information about this? 02. Can someone explain this to me, too? "Hydrogen red line is shifted, but other...

I have been reading some on QM and its quantization of energy and angular momentum (is this the same as spin?). But something I do not understand is the actual process of quantizational movement (which is tied to the quantization of energy). I can't understand how a subatomic particle, the...

This problem (it's not homework, I am looking for a concept) has stumped me. If a pool ball hits a a stationary pool ball how could I go about calculating how far the pool ball that was hit will travel until it stops? I have the masses and velocitys of both in motion but I can't seem to get a...

The magnitude of the current depends on the rate at which the magnet is moving in and out of the solenoid. True or false

The movement of a certain glacier can be modeled by d(t)=0.01t^2+0.5t where d is the distance in metres that a stake on the glaciers has moved, relative to a fixed position, t days after measurements began. Find the rate at which the glacier is moving after 20 days. What is the question...

A colonist on a distant planet with a radius 0.92 times the Earth's is pulling on a box of mass 12 kg across the floor. The coefficient of static friction between the box and the floor is 0.70. He has to pull with a force of greater than 73N to start the box moving. a) Determine the mass of the...

Hello all, This is a thought experiment I have been tangling with for quite some time now and still cannot find anything worthwhile on the net to determine its outcome. I'd like to know what happens if two singularities would collide head on. ( I know that singularites have no strict...

Hi all, How does one calculate the point where impact of a moving object actually begins to move a stationary one, rather than just make noise? Let's keep it simple and assume the objects are of the same material, the stationary one is not anchored, and they won't shatter or explode...

Object is dropped from a cliff of unknown height. I'm on another planet without the knowledge of the planet's gravitational acceleration. The object takes 4.15s to reach the bottom. Again, from the top of the cliff I toss the object upwards to a height of 2m then it falls back to the cliff...

OK, so for a small particle, \Sigma F=ma is very straight forward. If two forces are applied to that particle, the particle accelerates, which is determined by the summation of the forces applied. But what if the object is extended one, say, a solid uniform rod (1 kg). Also, imagine that...

The Earth spins on it's axis at approximately 2 mi/sec(795 mi/hr), it spins around the sun at approximately 18.5 mi/sec(67,000 mi/hr), and the sun along with all of the planets spins around the center of the galaxy at 144 mi/sec(1/10th the speed of light. So how come we don't feel all of...

Hi everybody! I wan't ask, what force makes electrons move? For example when electricity generator act, what force makes generators coil electricity? (I'm sorry! My english is very bad and this is my first time when I write something here) :smile:

I just want to know if this is correct. The question is: A boy and a girl on a skateboard push each other away at 30N for 1.2 s The boys' mass is 45kg and the girl's mass is 40kg. Determine the velocity after they have stopped pushing each other? How far did the girl move while their...

RCM or Rapid Cat Movement. Has anyone with a cat seen this besides me? He, my cat, seems seized at random times to get very excited and run around, recklessly. -scott

Suppose you have 2 iron balls that are connected to one another by a bar. The balls have equal mass. The bar has a fixed length, has no mass, and cannot be compressed or stretched. The object is in a total void with no gravity or wind resistance. The balls can move on a 2D plain, the X,Y...

Can anyone help me with this i have no idea how to solve it. You have two identical springs, each with a relaxed length of 50 cm and a spring constant of 450 N/m, they are connected by a short cord of length 10 cm. The upper spring is attached to the ceiling. A box that weighs 98 N hangs from...

Ok this is kind of a weird question...but: Assuming that something on Earth that is not moving is still in reality moving because of the planet's rotation around the sun, and assuming also that even the sun which seems to be stationary is also moving about the galaxy, and so on and so...

I have a question on "k" of an armonic simple movement. If we take the equation of a wave, this is: \frac {\partial \psi (x,t)}{\partial x^2} = \frac 1 v^2 \frac {\partial^2 \psi (x,t)}{\partial t^2} And this, if I'm not wrong, must to satisfy the independent of time Helmholtz...

In trying to fathom why matter would curve space-time, i realized a moving brane may offer a neat model of this. I made a drawing depicting how this would work which i think is better than i can explain in words. Don't take this too seriously, if you don't think it works just point out what you...

Hello A cable is attached at two (nonemoving)fixpoints. Now the cables midpoint is pulled downward, thereby destroying the catenary curve. Question: How will the cables center of mass (CM) move: op, down or stay fixed? My thoughts: I find it intuituitive that the CM will assume the...

I want help for the final part of the solution to the following problem (it's initial situation being illustrated in http://chaos.fys.dtu.dk/fysik1/hjemmeopgave5.pdf - the diagram at "Opgave 2"): "A small brick (B in the diagram) is at the bottom of the inside of half a barrel hoop that has...

I would really need help on these questions. A mass is on a piston that oscillates vertically describing a S.H.M. T= 1s. 1-At which amplitude does the mass comes off the piston? The answer is supposed to be 25 cm but I don't know how to find the position of the mass when it comes off the...

hi , I have a problem about vector coordinates. this is the problem. We have a 2-dimension space [x(unit vector i) and y( unit vector j)]. I have a circle of center 0 (0,0) and a point P such that OP = r. Vector OP and the x-axis have an angle of θ . there is a unit vector ir , with...

I was thinking a while back, after reading something about inflation. if you could build a device that will increse the distance between you and an object(lets say earth), you would be able the change posision faster then sublightspeed motion allows. because you would create distance, of which...

suppose the "elliot wave structure" and movement in markets is fact and causes a vibration everytime (a vibration is a change in price due to a factor, here being the range). The elliot wave structure says that markets move in 5 waves as shown below, one up, one down ect till the top, where...

NOTE: I have a physics question that I came across while working on a personal project. This is not a homework question. I was not sure which forum to put his in. I am not great at physics. However, I find that once in a while I need to use it in my daily life. I should have listened to my...

hi folks maybe somebody can help out concerning this topic... i once heard of an arrow paradoxon, even though I'm not sure whether it really is one. it is about movement, just check out the scenario: when you shoot an arrow towards an aim you can physically describe its movement from the bow...

hello, my first post here, I'm training as a physics teacher and my physics is quite rusty, it's been a good few years since university, i was thinking about heat (of air for example) being the kinetic energy of the particles and then i thought if that was the case wouldn't a mass of air with a...

http://www.vaxop.com/pic.GIF is my little picture what is drawn is a magnetic field pointed N to S (left to right) the helical path shown is the path of an electron taken in that field my question is, why is that so? at the far left, the magnetic field is ~constant, and according to the...

We've all experienced REM. I notice that while awake, with eyes closed (or even open!), I can generate a sequence of images by allowing my eyes to integrate together the present image with my semiconscious lucid thoughts. For instance, I might visualize a vacation spot in the Black Forest and...

First of all this is my first post on this forum, or any other forum of this type. I am extremely interested in cosmology, physics etc. on a personal knowledge level. I usually just read stuff on the web, but I am glad to have found a place where people actually actively talk about this. I...

Have you seen this video before? It shows a student quietly writing an essay when something starts moving rapidly within eyeshot of the student. Distracted the student asks the ‘thing’ to stop moving, well you’ll see the rest……. Video found here -...

I have a container of Marbles, if I place a rod in the centre, and proceed to stir clockwise, the marbles do not form any collective pattern, they just collide and move away in all directions. Now if I place the Marbles into a container of Water, and perform the above, there are moments when...

Is it true that nothing physical can move in space-time? As a layman in GR i really wondered whether anything physical can move in space-time because movement in space-time is self-referential and will contradict the basic definition of space and time. Also check out this...

Dear friends, I need some help with this problem. As you can see in the picture we have this mass attached to two springs of proper length l and I'm asked to analyze the movement after displacing the mass xo horizontally (being xo very small). I don't want you to solve the problem for me...

First, sorry for my bad english, it is a hard job for me. I am an engineering student and I have found that something doesn´t match. Imagine a cylinder, a wheel for example. Case 1) If it if it descends by a plane inclined because of its weight, the friction direction goes in the same way...

Okay, I understand that if you dedicate some motion to one dimension at a constant rate you consequently pull motion from another dimension. Like driving at an angle rather than a straight line traveling a longer distance to a said stopping line (traveling in two dimensions rather than one). I...

This, to most of you, is probably easy to work out. I have the following question: A car has a mass of 900kg and is traveling at 35m/s on a motorway. The driver sees that a queue has developed and applied the brakes to give the car a decelerating force of 2000N until it comes to rest. What...

Hi. I have been pondering on what movement is for a long time, and I think I have a theory (unprovable as of now). This is my theory. 1.Movement is tiny quantum jumps through space :confused: 2.movement is allowed my spacetime and energy :confused: Listnen to these questions...