Direction Definition and 999 Threads

Purchased a Netgear R7000 Nighthawk router that has 3 antennas mounted on the back. Is the maximum signal strength in the direction formed by the plane of the 3 antennas (left to right) or perpendicular to that plane (front to back)?

Hi, Can current flow both ways through a NOT gate, or is the diagram I saw, much like the picture I drew here, just drawn the wrong way around? Anyway, say it was correct, so what does this mean? Because the chip itself (the not gate chip Vcc = 5V and Gnd) takes 5V between it and the chip...

hi alll...we know that by changing the polarity of phase and neutral , direction of ac motor can be changed. but is there any automated device that does this job? ...

If a time varying magnetic field exists in vertically downwards direction in a region A, an electric field is induced in the direction perpendicular to it i.e. in horizontal plane. How to find the direction of the E field in the horizontal plane?What factors decide the direction of the E field...

I guess there would be no flow in case 2; case 3 seems easy to me applying fluid mechanics principle; flow will be 1 to 2. But I doubt case 1; it is not in thermal equilibrium ? Pls help

Sorry I'm a little rusty with my math and proof logic, and this feels like a dumb question, but oh well! The Euclidian norm of a vector in ℝ3 is \|{v}\| = \sqrt{x^2 + y^2 + z^2} where \|{v}\| \geq 0. I'm trying to show that there is always an infinite number of solutions for arbitrary...

Homework Statement You run towards the west with a velocity of 4 m/s for 5 minutes. You then continue running to the northeast (halfway between north and east) at 2 m/s for 8 minutes. (a) At the end of the 13 minute run , what was your total running distance? (b) At the end of the 13 minute...

Hello, In case of DC we use H-Bridges To control Dc motor direction and Speed with PWM. But in case of AC motor Single phase and 3 phase motor how to control Speed and direction?

Homework Statement \frac{d\vec{Y}}{dt} = \begin{bmatrix} 0 & 2\\ -2 &-1 \end{bmatrix}\vec{Y} With an initial condition of \vec{Y_0} = (-1,1)[/B] a) Find the eigenvalues b) Determine if the origin is a spiral sink, source, or center c) Determine the natural period and frequency of the...

Homework Statement Let A= 3i - 6j and B= 4i - 5j. The direction of the vector C = A - B is at an angle of? Homework Equations Magnitude= ( a^2 + b^2 ) ^1/2 Tan^-1 = b/a The Attempt at a Solution A-B = 3-4 i -6--5j -1i -1j Tan^-1 = -1/-1 = 45 45+180 = 225 Is this correct?

Homework Statement Hello, I have this problem: Four long straight parallel wires are placed in vacuum according to the picture, the distance between each wire is a = 20 cm. Through each wire flows electric current I = 20 A in the specified direction. What is the size and direction of magnetic...

Homework Statement Calculate the magnitude of the electric field at the center of a square 42.5cm on a side if one corner is occupied by a −38.2μC charge and the other three are occupied by −26.9μC charges. (This part done) Choose the correct direction of the electric field at the center of...

Homework Statement A bar magnetic is moved along the axis of a circular wire loop. In the figure below, (A) and (C) show the bar magnet moving toward the wire loop, while (B) and (D) show the bar magnet moving away from the wire loop. Image: https://gyazo.com/2944a79393e7955214b281da58e7b0b8...

Homework Statement Homework Equations The Attempt at a Solution https://scontent-lhr3-1.xx.fbcdn.net/v/t34.0-12/13140955_10156888508510486_863100825_n.jpg?oh=3f13a038f3dc053c7a10858aa62f6fc0&oe=57318819...

https://scontent-lhr3-1.xx.fbcdn.net/v/t34.0-12/13181084_10156883800920486_1357045350_n.jpg?oh=a39d7777f01c4aa06301c4f3d740de1e&oe=57301DBC Hi I am currently studying design engineering and my lecturer has left just before an exam. I really don't know how to find the magnitude and direction of...

In magnetic resonance, if we apply a 90 degree pulse in the x direction when we have a magnetisation orientated in the z direction. Why do we get the magnetisation then orientated in the -y direction immediately after the pulse? I don't understand why it would not be in the +Y direction

Homework Statement Hi everyone, I am a first year physics student and we recently learned about torque. Every time I think I understand it something else comes up to confuse me - this time it is the direction. I tried looking in the forum and generally in google, but everyone only explains the...

In the attached picture, can I say that there is a lift force in the Y-direction, and a drag force too in the same Y-direction? FL proportional to V_fx2 ? FD proportional to V_py2 ? Is this equation of motion for the Y-direction correct here: ma = − mg − FD + V(rho)g + FL The lift force is...

Homework Statement Hey everyone I have a physics e&m question: [/B] http://blob:https%3A//www.physicsforums.com/aa779f37-be23-43d7-a888-d70263a3854b Homework EquationsThe Attempt at a Solution I took the derivative to find the magnitude of the induced voltage. (do I need to add a constant...

Homework Statement i am confused about the direction of resultant force . in the working ,it's clear that the author taking to the right as positive , for the force component along x-axis , we have -Fx , but , in the calclulation , we gt positive 32230N , so the resultant force of x-component...

Does current flow from the positive lead to the negative lead of a battery? Does this ever reverse for any normal reason? I'd like to make my own circuits and I figure if current only travels in one direction then I wouldn't need a diode to stop the current from going back.

Homework Statement the energy level drop from point 1 to 2 , does it mean that the water flow from point 1 to 2 ? Homework EquationsThe Attempt at a Solution

They say that an electron accelerating radiates and loses energy, and that is one of the reasons why an electron cannot orbit a nucleus: - 1) does a charge accelerating in a straight line radiate, and what is the rate of radiation? do we have to supply extra Ke (apart from m/2 v^2) when we...

What determines the direction of current flow through the neutral wire? What determines the value of the current through the neutral wire?

Homework Statement Homework Equations no equations required The Attempt at a Solution can someone please verify if my answer is correct. Thanks! I used the right-hand rule for the motor principle (although another tutor on physics forum told me that its supposed to be the 'left-hand rule'...

Homework Statement A positively charged particle initially at rest on the ground accelerates upward to 180 m/s in 2.70 s .The particle has a charge-to-mass ratio of 0.100 C/kg and the electric field in this region is constant and uniform. What are the magnitude and direction of the electric...

Homework Statement My teacher said that if you are holding an object in your hands and lowering it downwards, you are applying force in the upwards direction. How does this make sense and are there any other cases where the direction of an objects force is opposite the direction of its motion...

Torque ##\tau## should be in the same direction as the change in angular momentum ##\Delta L##, but the following example seems to suggest otherwise. Consider a cone rolling on its side without slipping on a flat surface. Let the apex be the origin and the initial coordinate of the center of...

Consider a central force. The central force is radial by definition, so ##\vec{F}=f(r) \hat{r}##. Therefore, by definition, the acceleration caused by the force, in the direction of ##\hat{\theta}## must be zero, ##\vec{a_{\theta}}=0##. In presence of central force angular momentum is...

Homework Statement Homework Equations I = I1 + I2 ... + In R = R1 + R2 ... + Rn 1/R = 1/R1 + 1/R2 ... + 1/Rn The Attempt at a Solution Let I1 = I2 + I3 where I1 is the current on the top wire, I2 the current on the middle wire and I3 the current on the bottom wire. 4 = 10I2 + 20I1 //This...

According to the article: http://physicsworld.com/cws/article/news/2016/apr/07/birds-measure-magnetic-fields-using-long-lived-quantum-coherence : Is it possible simply to explain mechanism, how two coherent spins of electrons measure direction of magnetic field. I think that this explanation...

I'm sure this is a simple concept but i just can't wrap my brain around it, the question is: a) Express the following vectors in terms of x-y coordinates: i)Vector V with direction π/6 and magnitude 4√3. ii) Vector W with direction 5π/4 and magnitude 4√2. b) Express the vector v + w in terms...

[Mentor's note: Thread moved from technical sections so no template shown] So the calculations all make sense. But for example to find the direction of B2= 1.33 X 10-5T I believe you should position your right hand like this: Because your thumb should point in the direction of the current...

I have a problem in one my dynamics classes, I have a the velocity and accelerations of two points that are constrained to vertical motion. Point A has a velocity of 1m/s upwards and is decelerating at a rate of 4m/s2 and point B has a velocity of 2m/s downwards and is accelerating at 5m/s2...

Homework Statement Consider a particle of spin 3/2. Find the matrix for the component of the spin along a unit vector with arbitrary direction n. Find its eigenvalues and eigenvectors. Homework Equations I know that the general spin operator is \begin{equation} \widehat{S} = a\cdot...

Homework Statement Is the direction of net force always in the direction of motion? The Attempt at a Solution I would say no because the net force could be equal/balanced for example if two kids were pulling on a stick 2 N left <---- . ----->2 N right the Total Net Force would be 4 N with...

Homework Statement A hockey player with a mass of 30.0-kg is initially moving 2.00-m/s to the right. He catches on the stick a puck initially moving at 35.0-m/s at an angle of 60 degrees. The puck's mass is .18 kg and the player and puck form a single object for a few seconds. (A) Determine the...

If RNA polymerase moves from the 3' to 5' end of the template strand to synthesize an mRNA strand from the 5' to 3' end (http://www.ncbi.nlm.nih.gov/books/NBK22085/), how come promoters are located on the 5' end (said in my Biology class)? It was also mentioned that while RNA polymerase moves...

Is there any way to design a lens or system of lenses where I see the same part of the image, irrespective of direction or angle of view. The light rays can be assumed to be collimated as viewing will be from a distance. Actually- I am looking at focusing on a point or specific area of the...

Homework Statement Homework Equations The Right-Hand Rule The Attempt at a Solution I'm having some issues with the right-hand rule to find the direction of magnetic force, and I'm doing a homework problem. The answers I got are (letters are vector directions): A: -j B: i C: j D: i E:-i...

Do all stars in the Milky Way orbit the galactic center in approximately the same direction? Also, toward which Zodiac constellation is the Sun moving in its orbit?

The drive shaft of a truck undergoing acceleration twists a small amount. That twist defines a helicity. If you just know the rotation of a drive shaft you can not tell which way power flows but if given rotation and the twist of the shaft that can determine the direction of power flow? Thanks!

Homework Statement In pulley problems, how do you determine the direction of accelleration? My teacher said that acceleration is in the direction of the heavier mass or the steeper incline. Is this true? What if you had two objects of equal mass and only one was on an incline? Homework...

I can't seem to find anything online that talks about this distinction. I understand how when the water gets shallower that part of the wave gets slowed down so the overall alignment parallels with the shore. However, I wouldn't think that would change the actual direction of the wave. I need a...

Homework Statement When doing force problems, you're sometimes asked to solve for the magnitude and direction of a given force acting on an object given the mass of the object, its accelleration, and the other forces acting on it. However, the force that you need to solve for could be...

Homework Statement beam of protons moving in +x direction at speed v electric field is perpendicular to magnetic field magnetic field in +y direction no deflection What direction/sign has the electric field? Homework Equations not looking for numerical solutions The Attempt at a Solution...

Homework Statement A vertical wire carries a current straight up in a region where the magnetic field vector points due north. What is the direction of the resulting force on this current? The diagram shows a force arrow perpendicular to the B (magnetic field arrow). The magnetic field is...

What happens to a mechanical force's real original direction i.e. when we divide it into components of basis vectors, which in turn change as per problem at hand (like gravity components at inclined plane ), how we arrive at correct physics by taking two/three arbitrary directions of our choice...

Homework Statement What would be the opposite direction of [E 20 degrees N}? Homework Equations No real equation The Attempt at a Solution Is the opposite direction [S 20 degrees W]?

Homework Statement This is not a specific problem, but is it true that if you added all of the forces acting on an object except for friction, that the direction of friction would be opposite the direction of that net force(technically, it's the net force except friction)? For example, If you...