Movement Definition and 617 Threads

Homework Statement A particle moves in such a way that its position z, in meters, is given as a function of time t, by the equation z = 2t^2 − 3t^3. At what times is the particle at position z = 0? (two answers; one is 6E-1) Homework Equations z = 2t^2 − 3t^3 The Attempt at a...

i got a mass "m" which is stuck to a spring which is hanged from the sealing . k-the spring coefficient the formula for acceleration is a=-A*w^2*sin(wt+u) i need to calculate the force which the spring exerts of the mass in any given moment t=0 is when he was moved downward by distance A...

Is a proton's movement considered an object of Quantum Mechanics? I had this thought a while ago when we were studying movements of protons in a force field, specifically inside the field of a charged capacitor. The thing is that we used Newton's Second law to find the magnitude of the force...

I have been doing some experimenting with a relatively short cylindrical permanent magnet and a solenoid with DC current applied. I would like an explanation as to why these two things happen. The OD of the cylindrical magnet is just a little bit smaller then the ID of the solenoid. Placing...

1. The only force on a 5.0 kg object has components Fx= 20N and Fy= 30N 2. Find the acceleration of the object and its direction of movement. 3. I think I'm supposed to somehow use Soh Cah Toa inorder to find something (I don't know what this would help me find). I need to use...

The power is the amount of energy being transferred, the energy change [FONT="Courier New"]P = Fv at specific moment of time. The kinetic energy is proportional to speed: [FONT="Courier New"]E = mv2/2. I wonder how a finite force starts moving an object at rest. The zero velocity implies zero...

Im talking calc and physics in high school right now and I was bored and messed with my formulas but I need some help now.It's for rotational movement. If I have \varpid\varpi=\alphad\theta and then I take the integral will it be (\varpi^2)/2 = \alpha\theta or did I do it all wrong?

Homework Statement Hey guys. Where is the force which is created by the electric field, directed to? I think it's towered the bottom plate but I'm not sure. 10x. Homework Equations The Attempt at a Solution

This is my first post here, and I'm not really sure where I should have made it. If it's in the wrong place, please go easy on me and could an admin move it to where it should be. It's not strictly a homework problem, but it's fairly specific question, and not very deep or philosophical...

1.Your suitcase is on a baggage carousel, Your suitcase has not slid all the way down the slope and is going around at a constant speed on a circle (r = 9.10 m) as the carousel turns. The coefficient of static friction between the suitcase and the carousel is 0.740, and the angle θ of the...

Homework Statement Well, i have built this solar car, and the objective is (in my class) is to see who can get there solar car teh fastest in 20 metres (i.e. who can clear teh 20 metres in teh lowest amount of seconds). My motor specs are 23,500rpm 350gm-cm torque, 150mA all at 14.8 volts. My...

Homework Statement Two long coaxial cylindrical metal tubes (inner radius a, outer radius b) stand vertically in a tank of (dielectric) oil (suceptibility X-e, mass density rho). the inner one is maintained at potential V, the outer one is grounded. to what height (h) does the oil rise...

What will happen to a body that is not moving at all? What is its time and what is the shape of its space? I have been wandering about these questions for a long time now. I am beginning to realize that the space time continuum of a body / object is the product of movement of that body.If...

Hi, i want to know what are the real effects of air (drag) in the projectile movement and free fall, i mean how drag or air resistance is calculated in both movements, with equations.

(A) being a common pivot point for (B) and (C). In relationship to (A), I would like to have (C) move twice the DEGREE OF ANGULAR movement as (B). Any suggestions or thoughts on how I might accomplish this would be GREATLY APPRECIATED!

Hi ... I was trying to figure out a mechanism which allows for up and down movement. I figured a piston with crankshaft... anyone has any other possibilities? Thanks

When 2 objects placed one on each other and one of them pulled, the second will move in a contrary way. there is a way to proof it with Newtons law ? tnx .:smile:

Hi, So my former knowledge of electricity and its movements made me understand that only electrons move from the negative electrode to the positive and then through the wires back into the battery. But as I am reading from my textbook (about capacitors) I am starting to feel that even protons...

It seems to make intuitive sense for cloud movement to be dependent on wind, but is it actually true? Isn't the Coriolis Force a bigger factor in cloud movement?

Homework Statement Everything is in the pictures. I did part A, I have a problem with part B. 10x in advance. Homework Equations The Attempt at a Solution

A uniformly accelerating movement problem that we found in our book and we wanted to solve, but we are not sure if our solution is right: Homework Statement Two cars, (1) and (2), initially at rest, start to move from the same point, in the same road. Car (2), however, starts to move 3.0...

what would be the difference between the idea of being at point A and moving toward B in space-time; and being at point A and not moving and B not moving but the space-time between them moving and warping out of the way?

I want to model a car movement. The equations are: \sumF = ma \sumT = m \alpha The forces are, weight of the car, normal force and f the friccional force, but also the engine provides a constant rotational acceleration in my model. I understand that the frictional force is the one...

Homework Statement : VIEW ATTACHMENT FOR JPEG IMAGE of a) and b). Predict the direction of the charge (into the page or out of the page) for a) a proton moving into the page in the (-)z-direction when the B field is in the (+)x-direction, and for b) an electron moving into page in the...

The Earth is moving at a great speed about its own axis. Something inside a moving sphere also moves. Why don't we move with the earth? please explain me.

Homework Statement Write the difference between movement in one dimension and movement in two dimensions,also which are the different types for each of these movements Homework Equations The Attempt at a Solution

I want to move 30lbs vertically on a platform. To do this I will have a rotating threaded rod driven by a motor. How much torque, hp, rpm do I need? I'm guessing the pitch of the threads will be important. As far as speed goes, I only want the platform to move about an inch in 1-2 seconds...

Hi all! Im working on a small 3d tennis game, but I am not good with math. Can anyone make me algorithm for tennis ball movement (simulation). I have this parameters: ball starting point (x=left/right,y=up/down, z=is forward/backward), ball ending/bounce point which y is always 0. y at (z=0)...

in a microscopy class: problem is to illustrate the path of a positron on both sides of the axis in a coil produced magnetic field. consider both cases of the particle's velocity and the magnetic field being a)in the same direction & b)in opposite directions. i have no clue. any help? would it...

Hi there, I'm an electrical engineering student currently building a 2 axis solar tracker. I need to build the frame and I'm posting here because I have no mechanical knowledge at all ... The system is basically two motors, each for each axis which rotates a small solar panel (one rotates...

Let's say the universe exists as a collection of related static 3-d spaces, like in Julian Barbour's book The End of Time. Nothing ever actually moves. The illusion of movement comes from moving from one of these spaces to another which is closely related to the previous one. It's similar to the...

My sculptor wife has asked me to develop an electrical system for a kinetic sculpture that creates a 30 RPM movement at a whisper quiet level and yet fits into the palm of a hand. I'm looking at a 17mm diameter x 55 mm long mini-gearhead motor listed at "352:1 ratio that runs at 24 RPM @ 12 Vdc...

Linear movement --> Rotation Hey, I'm wondering how many different ways there are to transform linear translation into rotation. The ones that I'm a familiar with are; rack and pinion, Scotch yoke, Helical spline, crankshaft.. Are there other good ways of accomplishing this? Thank you for...

Hi This question really matters me and I would like to someone to point me out (rigorously if possible) why and what makes charge move in ideal conductor. All good conductors are modeled as being ideal so that the Maxwell equations inside the conductor needs not to be solved. So as electric...

On a ruler, you could move from the 1cm marking on a ruler to the 2cm marking, or you could move from the 0.5cm marking to the 1.5cm marking - both are 1cm movements but you cannot go from 1.5cm to 1cm in a 1cm movement. If we had Planck co-ordinates, could you move from 1 => 2 and also 1.5 =>...

Homework Statement (Q) A lamp is placed at the point (5,0) and it casts the shadow of an ant onto the y axis. When the ant is at point (1,2), how fast is the ant's shadow moving when the ant's x-coordinate is increasing at the rate of 1/2 units/sec and its y-coordinate is decreasing at...

Hi. I was wondering how strong an electromagnet would have to be to move water, such as a low stream from a tap or something.. I searched the forum a bit to the answer to this, and while i did discover that an electromagnetic field of sufficient strength will move water, the strength...

Homework Statement A block of mass m lies on a horizontal table. Suppose you push horizontally with precisely enough force to make the block start to move, and you continue to apply the same amount of force even after it starts moving. Find the acceleration of the block after it...

[SIZE="3"]1. First Problem Homework Statement A disc with mass of 50kg and radius of 20cm is rotating with a frequency of 480rpm, and after 50 seconds, as a result of the force of friction, it stops. What's the moment (momentum of force, torque) if during the rotation the disc made 200...

Homework Statement In bohr model of H atom, speed of electron/ e- is aproximately 2.20x10^6 m/s a) find force acting on e- as it revolves in a circular orbit of radius 0.530x10^-10 b) the centripital acceleration of the e- Homework Equations \sum F= ma= m(v^2/r) The Attempt...

[SOLVED] Particle movement down a track Homework Statement A particle of mass m = 6.60 kg is released from point A and slides on the frictionless track shown in the figure below. (ha = 5.20 m.) (a) Determine the particle's speed at points B and C. point B____________ m/s point C...

Good day to all! I just want to ask if someone here knows some data or measurement of speaker diaphragm movement(distance moved by the diaphragm relative to its resting position) of any speaker(any type or brand) when a certain frequency and volume is applied to it. I just badly need the...

how does the movement of stars compare to the movement of planets

Hey everyone, I'm new here. I'll try to be as clear as I can, but I'm warning you I'm not sure my science-English is accurate enough. I'll try though. So, It's a pretty basic question, but I still find it confusing: Say you have a body moving in a constant velocity v in relation to a...

Recently I attended a lecture related to the physics behind swing of cricket ball. But the speaker dealt with the swing before pitching(and dealt loosely with late swing). He took only the effects of air in consideration. I am interested to know how the pitch effects the swing(or seam movement)...

Would this statement be correct?

why does a razor blade placed on the water surface move away from a charged body?

Homework Statement A boat is moving with constact velocity -1 + 6j. Find the direction in which the boat is moving, giving your answer as a bearing. The Attempt at a Solution http://img483.imageshack.us/img483/2457/bearintgsxk3.jpg Alpha is the bearing I want right? In the mark...

Hello, First time post here, so if I violate some rules of protocol etc. please forgive and let me know! Anyway, I've been asking profs and other physicists this question, and the more-knowledgable the person I ask, the more complex the answer sounds! Two basic setups: (1) two masses...

Quite a funny question Now when we hit a shuttle cock by racket or any other means, the shuttle cock moves in the direction of the force but halfway the position of the shuttlecock changes ie in the beggning the cock faces us and then at halfway the cock starts facing the opposite...