Movement Definition and 617 Threads

I had a helium balloon in my car tied so it hangs down by string toughing nothing. Windows are rolled up. Heat and AC are off. Air inside the car is not moving and car is parked with motor running. When I step on the gas pedal and car takes off forward balloon goes forward towards the...

Hello, Obviously using a piston, you convert linear movement to circular. Or using a turbine. Other methods/mechanisms?

if you have 3 space ships on the x, y and z axis and they blast off...one of them must be moving in an absolute sense. Is it the case that if there is absolute movement then there MUST be absolute time also?

Hi, I've had an idea I would like feed-back. Let's imagine a particle on an x axis. On it's initial state it is localized in segment [0,1] as a purely symmetric wave. The quantum Zeno effects tells us that if we measure wether the particle is still in [0,1] n times during one second, the...

The Problem So, I know the basic, the basic differential equation of movement in terms of the angle it is formed, which has the form: 0 = g⋅sin[α(t)] + α''(t)⋅l. However, I decided to consider the friction force of the air, which is always contrary to the movement, and proportional to the...

Homework Statement A hand induces a transverse wave in a string by periodically moving up and down. This causes the string to move up and down. This movement propagates through the string producing a series of wavefronts which move towards the fixed wall with a velocity v. How do we...

So, when you bring a charged object near for example a soda can, I get that the soda can gains a positive side and a negative side, but the can also moves towards the charged object, why is that? Is it because if you put a negative charged object near the soda can the side of the can nearest to...

Homework Statement please check if my answer is ok. There is a rod, with length L and maximum angle α swinging from the ceiling and making harmonical movement. What is the angular velocity of the movement? Homework Equations ω = sqrt (g/l) The Attempt at a Solution that is the answer? it's...

Can we predict the movement of a magnet in a uniform magnetic field using Maxwell's equations? What if the magnetic field is variable, for example if we have two magnets moving in a reference frame? Thank you for any answers and I wish you a Merry Christmas! :)

Hi, It's my first post here on the forum and I'm just looking for an answer to a basic kinematic movement equation. This is the text of a problem: "A bike accelerates uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m. Determine the acceleration of the bike." Now, in the...

Homework Statement A body that is on a horizontal surface begins to move under the action of horizontal force equal to 60% of its weight. Force acts for a while, then stops acting. Determine the total time of movement if the body has traveled a distance of 24m. Homework Equations [/B] I'm...

I have this problem to solve until tomorrow: A point moves along the parabola r*cos^2(θ/2) = p/2, p > 0, in the direction that θ increases. At the time t=0, the point is on the verge of the parabola. The velocity is v = k*r, k>0. What is the equation of movement, the radial acceleration and...

Hi, The goal here is to increase/decrease the angle x by 5 degrees. the black circles represent a rubber tire (same as car tires, only smaller), 5cm in diameter, rotating on it's center, powered by a motor. each wheel has 40 psi (2.76 bar) of air in it. the yellow tray on both diagrams are...

Hi there, I am doing a physics assignment. I had to use a program called tracker to simulate the movement of a puck. So I just need some help to see if anyone can figure out what I've done wrong as something isn't making much sense. Let's jump right into it. When the puck moves down and hits...

I want to test the accuracy a linear displacement sensor (Hall effect) that I have, but I'm not sure what to measure it against. The sensors are made to measure with a resolution of 10μm. My initial thought was to use a drill press to move up and down, but I don't think I know of any that are...

Hi. First, let me introduce myself: I m from Brazil, I studied physics a few years ago and I ended up leaving the course, today I work with software development. I would like to know if you can help me to take a doubt: I came up with an idea that an electron could move so fast that it would...

Homework Statement A boat, moving at the velocity of 9,9m/s turns off its engine and starts decelerating at the rate of a=-kv^2. What is the velocity of the boat after 4,9 seconds if the constant k is k=5,5m Homework EquationsThe Attempt at a Solution I tried to integrate deceleration to get...

Dear all, to keep me busy on a Sunday I considered the "1-body radial movement in a (Newtonian) gravitational field problem". I was a bit surprised to find it quite hard finding decent explanations on it. My question is: does anyone have a reference of the explicit solution to the particle's...

In DC, we have learned that the electrons move from their position through the conductor, resulting in a current. They leave their positions on the application of a potential difference, and move or flow in the direction of higher to lower potential, thereby causing a current. But what about...

I’ve been on cruise ships and recreational boats. But, that’s not something I do every weekend. That’s just an occasional thing. On the smaller boats, I can feel the ebb and flow of being on the ocean more noticeably. On the cruise ships, I have to be real still and off in a quiet place to...

Hello I'm trying to understand how exhaust systems work .In general I want to understand how air movement changes according to leight of vent tubes. Example I have made little vent system with in lane fan that sucks air out of room. As I understand air speed in tube that is pulling air from...

Homework Statement A person enters a curve of a waterslide with velocity v. The curve is fully horizontal and has the shape of a circle segment of radius R, there is no friction and width of the curve can be neglected for calculating the centripedal force. The waterslide itself can be described...

A flywheel with a inertia moment of ##245 kg \cdot m^2## rotates making 20 round per second. The wheel stops 20 minutes after a braking moment action. Calculate the intensity of the braking moment $$ \omega = 20 \frac{round}{s} = 126 \frac{rad}{s} $$ $$ t = 20 min = 1200 s $$ The braking...

Homework Statement m1= 0,05 kg, m2= 0,03 kg, mass of spring is omitted. We look at movement after spring stopped vibrate. How long does the spring measure during the movement if not stretched spring measure 0,1 meter and if we use force 0,1N elongation measures 0,02 meter. (sorry, English isn't...

In the Great Courses lecture series "Oceanography", Prof. Tobin says that the general direction of beach sand movement ("sediment transport") along both the east and west coasts of the USA is from north to south. On the east coast, this is because the prevailing direction of waves is from the...

The other day I used my Ludlum survey meter to check out if any of my old junk electrical part may show any traces of radioactivity. I was rather surprised to find an old meter movement magnet showed some activity. Today I took some pictures while determining just how much activity there was...

Hi Any line joining points A and B has infinite points. So, when I move from A to B, do I cross infinity?

Hello, I need to know a bit about lightning/discharge, in a small scale ofcourse. I have the impression that we can somehow (with a battery) charge a metallic tip and then if we put another metallic tip close enough, a lightning will be created. Is this correct? In addition, I would like to...

Basically a weight moves from starting point on a ramp down to the bottom of the ramp. The ramp is on wheels so the ramp will also move. The formula is based on the center of mass of the combined object. Center of mass does not move. XA0 = position of small mass before it slides down ramp XB0 =...

Hi guys! I want to thank to all the guys which helping us to understand the beauty and mystery of the relativistic theory. Here I just want to share the calculation of Lorenz factor for the moving clock in the frame of reference of the "stationary" observer. This time the clock is not...

Can it be said that time is directly related to movement? That is to say, on a quantum level, if all motion were to cease, would that not bring about the cessation of time?

I apologize ahead of time if this thread was made in the incorrect post. I have only taken Physics III (Mechanics) and am now taking Physics IV (Electricity/Magnetism). I have yet to find a description of every type of forum here. In class, I was understanding everything that was mentioned and...

Hi I am trying to make a CAD model of something like the scoop sampler shown below. http://www.rolls-royce.com/~/media/Files/R/Rolls-Royce/documents/customers/nuclear/scoop-sampling-tcm92-50918.pdf This is for a university coursework that requires design of bespoke machines. I am trying to...

Homework Statement [/B] So here is the problem: We have a pencil , horizontally towards us, sitting on a table(see the picture). There are no external forces applying on the system table-pencil and friction of air doesn't exist. There is also no friction between the pencil and the table. So...

Hello all, First of all let me say this is my first post here and I don't know if I'm placing it into the right forum/place. If I'm doing something wrong or similar, please let me know and I'll try to solve it asap. This is not homework, but it is for sure introductory level so I've thought...

I would like to know if recoil movement velocity varies within a system (such as holding firm, loose or allowing object to free recoil) then would the muzzle velocity of the projectile vary as well? Thank you

I was zooming around the NE region of the South Island of New Zealand in Google Earth today and discovered a classic example of offset stream channels across a major fault, the Awatere Fault. The Awatere Fault which is one of the major faults that the Alpine fault splinters into in the upper...

NOTE: I seem to have a dental implant in which there has been a mechanical failure of the abutment, which has piqued my interest in this. The paper is here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4668729/ About 40% down, there is: *** The most commonly used retaining screws are either...

Homework Statement The system consists of a long cylindrical anode of radius a and a coaxial cylindrical cathode with radius b (b <a). On the axis of the system has a thread with a heating current I, creates in the surrounding magnetic field. Find the smallest potential difference between the...

Homework Statement Show that for the case of a general inhomogeneous magnetic field, $$\dot{\vec{v}}=\frac{e}{2mc} (\vec{v} \times \vec{B} - \vec{B} \times {v})$$ The attempt at a solution I think I am oversimplifying things. I used that, for an electron in a magnetic field, m \frac{d...

Homework Statement John is entering Steward, and drives West, with a Uav of 88 km/h. He arrives at Aurora, and realizes he took a wrong turn. He turns around and drives East, towards York, with a Uav' of 79 km/h. Steward-Aurora is 76 km & and Aurora-York is 34 km. For the whole trip (S -> A ->...

Homework Statement A particle is thrown in the angle pi/3 radian with speed 10m/S. Find the time of movement if the maximal height is equal to the distance of fall. Homework Equations v^2-voy^2=2gh The Attempt at a Solution 0-10^2*3/4=2*10*hmax hmax=3.75 v0x*2t=3.75 v0*cos60*2t=3.75...

I've been thinking about centripetal force and circular motion. I know that an object experiencing circular motion has a velocity vector tangential to the circular path and an acceleration vector perpendicular to its motion, pointing towards the center of the circle. What I don't get is why...

I will start with an excuse, sorry english is not my main lengauge and i don't practice grammar that much, it is my first time in these forums so be kind, i hope i posted on the right forum thank you for the comprehension. When you move your arm for example do you generate a trail of vacuum...

Homework Statement The diagram represents a cylindrical aluminium bar AB resting on two horizontal aluminium rails which can be connected to a battery to drive a current through AB. A magnetic field, of flux density 0.10 T, acts perpendicularly to the paper and into it. In which direction will...

Homework Statement Come up with expressions for centripetal acceleration at the top of the small hump and the bottom of the loop. (this is one substep in a larger problem) Homework Equations f = ma The Attempt at a Solution Taking down to be negative, I believe that the f = ma equation at...

Homework Statement Consider a uniform rod of mass 12kg and length 1.0m. At it's end the rod is attached to a fixed, friction free pivot. Initially the rod is balanced vertically above the pivot and begins to fall (from rest) as shown in the diagram. Determine, a) the angular acceleration of...

I have read in my biology book that "nastic movement is the movement that occur due to difference in the rate of growth on two opposite sides of a plant organ" , but I can't visualize how this movement take place and how the rate of growth cause this movement?

Hi there, I hope you experts can help me out: I have a braiding process in which a rod is wrapped around with braiding wires. Pulling the rod is the linear velocity, spinning of the braiding wires around the rod is a circular movement. Added together they form a helical movement. The ratio of...

Hello! I'm having a little problem to figure out the rotation of a spherical mass, maybe you have more clear ideas! Imagine to have a sphere laying (just it weight) on a support with three contact point: 1) one wheel, that has an external torque apply. 2) helping support that touch the sphere...