Movement Definition and 636 Threads

Homework Statement Hello everyone, i have been stuck on this question on the Physics year 12 Nelsons textbook, and it is pissing me off because I've been working so hard on it and i can not get it. It is in the chapter of Movement in one and two dimensions. The question is: A person...

I'm not very good at science, let alone physics so can someone please help me with my project. Its about animals movement I think i am going to do it on cats, rabbits, horses and birds. Any information would be fine I would like to know stuff like e.g. what does a horse do when its about to...

Homework Statement A material point A of mass m has a rectilinear movement on the horizontal axis 0x. It is subject to the action of a constant power force P and to a force due to air resistance of \betamv2. It starts at a still position on x = 0 for t = 0 in the direction of +x. Find the...

Homework Statement A student proposes to measure the gravitational constant G by suspending two spherical objects from the ceiling of a tall cathedral and measuring the deflection of the cables from the vertical. Draw a free-body diagram of one of the objects. If two 100.0-kg objects are...

Now, I am very dull, but something that has made me ponder for quite some time is movement and how you define it. As I've understood the movement of the atoms is what can make an object feel cold or warm or maybe even painful, and when you drop an icecube in a cup of water it will cool down...

Hey, I'm not trying to seek medical advice here, but you all are a smart bunch so I thought I would ask you guys for your opinion. My girlfriend has been having some stomach problems for the past few months (they're on and off) where she will be constipated and barely poo at all. She has...

Homework Statement In a distant galaxy, an emission line of hydrogen that has a rest wavelength of 656 nm has an observed wavelength of 662.6 nm. Is the galaxy moving away from us or toward us? How fast is it moving in (km/sec)? Homework Equations velocity = ((shifted wavelength -...

I don't learn in English so I may phrase words incorrectly. Just let me know if something doesn't make sense Homework Statement A body moves in one dimension where his speed is dependent on time: v(t) = t^3-10t^2+16t, t \geq0. v is in m/s amd t is in s. a) what is it's initial speed? b)...

Homework Statement A woman pushes a crate with a force of 400N downward at a 35.2 angle down below horizontel. The crate weighs 300N. If coeffiecient of kenetic friction is 0.57, how much time does it take to move box 4m from rest. Homework Equations Fg=mg Fk=(muk)mg The Attempt at...

This came up in class today and based on the equations it makes sense, but logically I can't get my head around this. Let's say we've got a hydraulic system with two pistons: Piston 1: 2cm2 Piston 2: 12cm2 Piston 1 moves a distance of 21cm, which according to A1D1=A2D2 means that Piston...

How would I work out the pitch circle and number of teeth required to move the mechanism a certain amplitude? Looked over 4-5 sources for pitch circle, but cannot make sense of it..

Hi Guys. I hope I’m posting this in the correct section within this forum. Please excuse my question as i have no idea about any physics and my mathematical knowledge is limited. Can someone tell me if my understanding in correct. If an object in space moves, it will never stop unless...

hey I've been snooping around trying to find out who invented the D'Arsonval/Weston galvanometer movement? I am not able to find it or in other words I am getting different sources from different web?.. so who invented the D'Arsonval/Weston galvanometer movement.?

When calculating the space velocities of stars by combining what we see of both their radial and proper (tangential) motions, how is the final velocity determined?I don't believe they just add these two vectors together do they? Do they make use of the transverse Doppler shift calculation here?

Since space and time are considered one thing due to Einstien's research... Would time be considered the movement of matter through space? Or possibly that time is created by extremely massive objects such as the sun? I'm not sure.

A 4.0 kg bundle starts up a 30° incline with 128 J of kinetic energy. How far will it slide up the plane if the coefficient of friction is 0.30?So, I began finding the Normal N=W(y)=4cos30=3.46 Then found friction f=uN f=.3*3.46=1.04 So E=E K=Ug + Q K=mgh + fd K=mg(dsin30)+fd...

I have a question about the propagation of light, I am not that technically versed in all the matters involved so it is a philosophical question. The principle of relativity, deducible from Newton's laws, has long been considered verified experimentally, most famously by Michelson-Morley's...

Homework Statement a disc of radius r spins uniformly around its axis at an angular velocity \omega in a clockwise motion. the center moves on the horizontal line z = r of a vertical axis Oxz of the referential Oxyz. We call R' = Cxyz, in translation compared to R= Oxyz, of origin C and we...

So this was a test question, I got the wrong answer, now I know why, but I'm not sure which is the good answer Homework Statement A spaceship is flying in outer space, engines off. At a certain point A in space, the spaceship starts drifting sideways with a constant speed and in a straight...

Homework Statement A particle traveling in a straight line is located at the point (1, -1, 2) and has speed 2 at time t = 0. The particle moves toward the point (3, 0, 3) with constant acceleration 2i + j + k. Find its position vector r(t) at time t.Homework Equations Speed = |v| The Attempt...

Hi All. Im trying to make a computer program that calculates the movement of a ball in the air. i'll need information as: - the air density - the ball's crosssection - the ball's current acceleration - the balls current speed is this enough to calculate the frictional force...

Hello.. Am an Electrical Engineer, my FYP concerns the artificial limbs... I made a small research about the nervous messages, and how it flows from the brain until it reaches the muscles. In the arm i found that there are 3 nerves (Ulnar, Median, and Radial nerve) which are responsible for arm...

I am working on a project where I have to calculate the affected water movement in an open channel. What I mean by affected water movement is the gallonage moved by an inertial force such as a stream of water discharged under pressure. For example: A 1" pipe is discharging 10 GPM into an...

So I was reading an article late one night, and the writer tried to sound smart and mentioned how water "retains a memory" and if you splashed a few drops of water on your hand, the water would follow the same path, like how if you throw water on a window, the water will always "trace" the same...

I've been trying to work out for a while now the total speed that something on Earth's surface travels through space at any given time. I'm not sure about my maths though, so I'm wondering if anyone can help me. These speeds are rough estimates based on various articles and explanations that...

The interesting thread on teacups reminded me of my own unexplained mystery. And, it makes me think how many people will immediately think of ghosts or gods when something strange happens, instead of finding out what is really going on. There could be a whole category for such stories...

What is the effect on a vector when it is multiplied by a matrix? Let any matrix 2 3 3 5 What will be the effect on vectors when they are multiplied with this matrix? In which direction will they move? What will be the effect of multiplying vectors with any matrix of order n by n?

how to rotate the shaft and to move it linearly in a single axis

I want to simulate the (probably chaotic) two dimensional movement of a chain, given that there is no gravity, and all of the links of the chain have some constant mass. Additionally, there is an assumption that the chain cannot collapse - all of the links of the chain will always be touching at...

1) So i found on Wikipedia that the Earth takes 365.256363004 days to orbit the sun. If you include leap years then the average calendar year is 365.25 days. So the calendar year is off in accuracy by the difference. Calculating that out would mean that in 157 years the calendar would be off by...

Why do we call them 3 dimensions when all that they are, are just the ability of movement in space? Physical movement cannot be restrained in any vector. It takes place in a 3 dimensional dimension. Thus 1 dimension is physical movement in space and the second dimension is time. Within the 1st...

i just want to know if this is possible,say i want to bring about sideways movement to the wheel and want the car to move horizontally.by providing an expandable material connected at the end of the axle to either side of the wheel ,so whenever sideways motion is required as the material...

Homework Statement A constant electric field of magnitude E = 120 V/m points in the positive x-direction. How much work (in J) does it take to move the charge Q =11 μC from x1 = -67 m, y1 = -36 m, to x2 = 98 m, y2 = 75 m? Homework Equations You see that's the problem... I have no idea...

Although some would argue that this is a Biology problem, I would like to read some views from physicists regarding the following problem: Amoebas have no muscles nor cilia (microscopic, "paddling" hairs). Yet they are highly mobile. They move about by pushing protuberances, called...

- Hello. ... New to the site. Had been searching for "Physics" focused forums, with an attached meteorological element, and found this one.I've been looking into and investigating the "notion" that main "tractive" force *, might have a great deal to do with main and broader cold air mass both...

The "Grassroots movement", and the Tea Party I consider every step forward for the Tea Party, and every primary Republican win for so-called grassroots leaders who appeal in particular to the tea drinkers, to be just more nails in the coffin for the GOP. While the Tea Party wants to claim the...

Homework Statement The relative motion of two atoms in a molecule can be described as the motion of a single body of mass m = 3 x 10-26 kg moving in one dimension, with a potential energy given by the equation U(r)=(A/(r^12))-(B/(r^12)) n this equation A = 10^10 J m^12 and B = 10^20 J m^6 are...

Homework Statement If the time of a particles movement at a certain position can be described t_k = t_{k-1} + \Delta t write an expression for the velocity at t_k 2. The attempt at a solution if I assume that the corresponding position of the particle is s_k = s_{k-1} +...

please can anyone help me to figure out the equations of human body movement ( walk ) I am in need so badly .. Best Wishes

Homework Statement The problem consists of finding a set of 2 differential equations describing the motion of a round object moving inside a 2D-bowl, of equation y=x^2. Only data given is that the equations have to be in the form of : (x1)'=x2, and (x2)'=f(x1,x2,weight of object, gravitational...

Homework Statement A certain star is 76.6 light-years away. How many years would it take a spacecraft traveling 0.946c to reach that star from Earth, as measured by observers on Earth? How many years would it take to reach that star from Earth, as measured by observers on the spacecraft ...

im having some issues understanding the way electrons orbit a nuclies. i know they don't orbit hte nuclies in a circle but in envelops. can someone describe how they move to me please

hi just a general question, i was setting up an experiment the other day where a spring launched a cube with a mass of 176g with 30N of force along a 85cm surface with friction coefficient of 0.27 (according to the teacher), i got the answer but that's because my class mates helped me in my...

Homework Statement How does an electron get from an excited state (r = 4ao) to a ground state (r = ao) without being anywhere in between? Homework Equations The Attempt at a Solution My only attempt would be to say that it does exist between for a short time, and during that time it emits a...

Hey there! I'm working on a bit of a game modification, and I'm looking for a little help with some physics-related math. I'm only in my second year of high-school physics, so I'm not completely sure where to go with this question. And sorry if this is in the wrong forum. Essentially, I'm...

Homework Statement confession Olympic hammer competition, competitor turns mass 7.3 kg ball at the end of a metal cable length 1.2 meters. Throw the hammer was released some 1.3 meters high 21 ° angle above horizon. Last horizontal distance was 83 m hammer, what is the radial acceleration of...

Why do strings, etc vibrate in harmonics? Is it a characteristic of all waves, a consequence of the way energy propagates along a wave? If so, how?

(Moderator's note: thread moved from "Differential Equations") A particle of mass m which moves along a horizontal straight line with a velocity of v encounters a resistance of av + b(v^3), where a and b are constants. If there is no other force beside the resistance acting on the particle and...

1. Which, if any, has the greater influence on rate of movement down a slope with a constant distance of 80cm: the gradient of the slope or the mass of the object moving down the slope? 2. acceleration = net force / mass 3. If the slope is 90 degrees, the rate of movement of falling...

I'm no physicist, but I just have some questions... 1) The universe is expanding, correct? This means that its centre of mass is constantly changing, and the centre of the universe is also constantly changing (well... if the universe is spherical, and was increasing in proportion to a...