Direction Definition and 999 Threads

One Direction, often shortened to 1D, are an English-Irish pop boy band formed in London, England in 2010. The group are composed of Niall Horan, Liam Payne, Harry Styles and Louis Tomlinson; former member Zayn Malik departed from the group in March 2015. The group signed with Simon Cowell's record label Syco Records after forming and finishing third in the seventh series of the British televised singing competition The X Factor in 2010.
Propelled to global success by social media, One Direction's five albums, Up All Night (2011), Take Me Home (2012), Midnight Memories (2013), Four (2014), and Made in the A.M. (2015), topped charts in most major markets, and generated hit singles including "What Makes You Beautiful" (their first number one on the UK Singles Chart, and the highest debut for a British act on the US Billboard Hot 100 since 1998), "Live While We're Young", "Best Song Ever", "Story of My Life" and "Drag Me Down". After the release of Four, One Direction became the first band in the US Billboard 200 history to have their first four albums debut at number one. Their third album, Midnight Memories, was the best-selling album worldwide of 2013.Considered teen idols, One Direction were often subject to fan hysteria. They embarked on four world tours, two of which were all-stadium. The band's Where We Are Tour, in support of Midnight Memories, was the highest-grossing concert tour in 2014, the highest-grossing tour by a vocal group in history, and the 15th highest-grossing concert tour of all time, grossing $290.2 million (unadjusted for inflation). The band went on hiatus in January 2016, allowing all members to pursue other projects.As of 2020, the band have sold a total of 70 million records worldwide, making them one of the best-selling boy bands of all time. The band have won nearly 200 awards, including seven Brit Awards, four MTV Video Music Awards, six Billboard Music Awards, seven American Music Awards (including Artist of the Year in 2014 and 2015), and 28 Teen Choice Awards. In 2013, they earned an estimated $75 million, becoming the second highest earning celebrity under 30 according to Forbes. As the world's best-selling artist of 2013, the group was named the Global Recording Artist of the Year by the International Federation of the Phonographic Industry. In 2014, Billboard named the band "Artist of the Year". Forbes ranked them as the fourth highest-earning celebrities in the world in 2015, and second in 2016.

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  1. Lucw

    Exploring Light Diffraction: Insights from Feynman's Books

    Hello Here is the shadow of the edge of a screen. This picture is in one of Mr Feynman's books. (Http://www.feynmanlectures.caltech.edu/I_30.html) Of course, there is light interference in the edge of the shadow. It's normal. It's diffraction. Mr Feynman explains how to geometrically build this...
  2. P

    B Force of gravity along the radial direction

    I am trying to work out the velocity of the ball in a loop in terms of theta from the horizontal (like a unit circle) as it loses contact with the track. And having a lot of trouble understanding this equation m*g*sin(theta) = m*v2/r and this explanation: The ball will leave the rail when...
  3. B

    In which direction does the current flow?

    Homework Statement We bind two batteries with voltage 2V and 1.7V with inner resistance 0.2Ω and 0.1Ω in parallel series in such way that we bind each positive poles and negative poles together. What current runs trough the circle? What is the voltage between contact points of the batteries...
  4. Tomi Kolawole

    Direction of magnetic field problem (Right Hand Rule)

    Homework Statement Homework EquationsThe Attempt at a Solution I have already solved for the magnetic fields everywhere AND THE magnetic field at R>F = (U/2*PI*R)*(I2-I1) My only problem is i know i use the right hand rule to determine the direction of the magnetic field B as clockwise or...
  5. S

    When Can We Use the Right Hand Rule to Find Magnetic Field Direction?

    When can we use the right hand rule to find the direction of a magnetic field from current? I know that it works for an infinite wire. Does it work for a finite wire? Where does it work and not work?
  6. M

    Determining the direction of magnetic force

    Homework Statement Referring to (b) in the picture above: What is the direction of the magnetic force on the electron? Homework Equations I use the right-hand rule where by putting your index finger in the direction of the magnetic field and thumb in the direction of the velocity, the middle...
  7. M

    Impulse Question -- A car changing speed and direction

    Homework Statement Cart travels with a mass of 100kg in the 25m/s in the X-Direction and then 20m/s in the Y-Direction. What is the impulse? Homework Equations I = m*change in velocity The Attempt at a Solution I = 100(20 (j) - 25(i)) I = (2000 (j) - 2500(j)) kg* m/s Is this correct?
  8. K

    Direction of the Magnetic Field at a Point

    Homework Statement The problem asks to find the direction of the magnetic field at point P, which is at the center of 2 separate semi-circle wires that form a circle. The current in each wire flows in the same direction (to the right). I attached a picture below. Homework EquationsThe Attempt...
  9. yecko

    Solving Torsion Direction Homework Statement

    Homework Statement Homework Equations Angle of twist = TL/JG The Attempt at a Solution T & L is inversely proportional. But how can i start attempt the question? I think it this way: like moment=L*F, and torsion torque is like force, angle of twist is similar to moment (as TL are also...
  10. WeiShan Ng

    Direction of the magnetic field around a solenoid

    Homework Statement Example 5.9 in Griffiths's Introduction to Electrodynamics 4th shows us how to find B of a very long solenoid, consisting of n closely wound turns per unit length on a cylinder of radius R, each carrying a steady current I. In the solution, he goes on to explain why we don't...
  11. J

    Angular momentum direction for a spinning top

    Homework Statement Hi I'm having trouble with a question that's asking me to calculate the precession rate for a spinning top. The trouble that I'm having is that I don't understand how the angular momentum points along the axis of the spinning top (picture attached). When I use the formula...
  12. A

    Determining the direction of electric field lines

    In general, the field lines points away from the positive charge and toward the negative charge. The answer is letter E, but the second part of the answer says, "the magnitude of q1 is less than the magnitude of q2". Is that because q1 is negative and q2 is positive?
  13. Amazingly Andrew

    B What speed and direction are we actually traveling?

    I'm thinking about flying off in a spaceship that travels half the speed of light so I can, in effect, travel into the future, since everyone stuck on Earth will be going relatively slow and aging relatively faster than me. But my concern is that I don't know which way to go. Right now the...
  14. Monoxdifly

    MHB [ASK] Determine its velocity and direction after √(3)/2 seconds

    Something was thrown with an elevation angle 60^{\circ}. Determine its velocity and direction after: a. \frac{1}{2}\sqrt3 second b. \sqrt3 second I tried solving the (a) question by substituting the angle to the equation y=v_0\sin\alpha t-\frac{1}{2}gt^2 and got 0 (the book uses 10m/s^2 as the...
  15. L

    B If electrons are waves, what causes them to change direction?

    If electrons are waves, what causes them to change direction and move up and down?
  16. PumpkinCougar95

    Direction of induced electric field?

    If there is a very very big(infinitely big) region of space where ## \frac {dB} {dt} = constant ## what would be the E field at any point? Obviously ## \nabla x E = constant ## but what after that ?
  17. S

    Apparent ambiguity in the E field direction in Faraday's Law

    I'm confused by an apparent ambiguity in the direction the E field in Faraday's law: ∫ E°dl = - ∂/∂t ∫ B°da Faraday's law says the change in magnetic flux through an open surface gives rise to an emf equal to E°dl taken around the closed loop which is the boundary of the open surface. And...
  18. F

    Direction of particle between two plates

    Homework Statement Homework Equations The Attempt at a Solution Since Fel > mg , the particle will move up with acceleration
  19. D

    What is the displacement and average velocity of a classic car in a road rally?

    Homework Statement You enter an antique classic car road rally with your 1956 Studebaker Golden Hawk. The rally course consists of the following segments: travel north at 25.0 m/s for 30.0 min, then east at 32.0 m/sfor 40.0 min, and finally northeast at 30.0 m/s for 50.0 min. For the entire...
  20. F

    Speed and direction of b and anti-b quark

    Homework Statement A Higgs particle of mass M is moving in the z-direction with speed $\Beta_H$c compared to the lab system. It decays to a b-quark ans anti-b quark, each of mass m. What is the speed and direction of the b-quark compared to the lab-system, if the Higgs system, (a) it is emitted...
  21. C

    What is the direction of the current in the given image?

    Homework Statement In the picture 20.40, what is the direction of the current induced in the resistor at the instant the switch is closed.[/B]Homework Equations Right hand rules- Point thumb in direction of current and your fingers will curl in direction of magnetic field. Lenz's law. The...
  22. Math Amateur

    MHB Axis Through x in the direction u .... in R^k .... ....

    I am reading the book "Several Real Variables" by Shmuel Kantorovitz ... ... I am currently focused on Chapter 2: Derivation ... ... I need help with an interpretation of a statement by Kantorovitz near to the start of Chapter 2 ... The start to Chapter 2 in Kantorovitz reads as folows...
  23. M

    Confused about choosing current direction in nodal analysis

    Homework Statement The problem states: Determine the voltage labeled v in the following circuit: https://ibb.co/hz0Q37 The variable is the voltage across the 2 ohm resistor. The ground I chose for this example is located in the center of the circuit. Homework Equations V=IR I guess. The...
  24. Davephaelon

    A Alcubierre Drive Direction: How Does Craft Move?

    I was watching an excellent presentation of the theory of the Alcubierre warp given by Miguel Alcubierre himself at the 2017 Starship Congress (link below). At the 43:55 mark Alcubierre explains that the negative energy is located around the circumference of the craft in a toroid. I always...
  25. L

    Finding magnitude of vector without direction (kite problem)

    Homework Statement A child is flying a large kite of mass 6.8 kg on a windy day. At the moment shown the tension from the string on the kite has a magnitude of 17.0 N and makes an angle of = 32.6° from the vertical, and the acceleration of the kite has a magnitude of ak = 7.72 m/s2 and makes...
  26. A

    Why is the magnetic force directed downward in this scenario?

    Good day All! while trying to solve this question I use the right hand rule and according to it the Force should be directed outward (pointing toward me) but here is the answer that puzzeld me I really don't get why it is down , and would feel very grateful if someone can explain me the...
  27. Wes Turner

    Conservation of energy in x vs y direction

    Homework Statement A child goes down a water slide. The slide is 9.0 m tall. She pushes off with an initial speed of 2.0 m/s (in the horizontal direction). If the slide is frictionless, how fast will she be going at the bottom of the slide? Homework Equations In the book, they use a...
  28. S

    B Light Clock Traveling in Z Direction

    Hi, I'm studying GR these days. But then I got to thinking about something about SR and got kinda stuck. I know that if a light clock is moving in the x direction(from left to right), the light beam has to traverse more space and then you will see this person's clock running slower in the...
  29. M

    What is the Direction of Induced Current?

    Homework Statement The problem is simple, all I have to do is draw a voltage / time graph. The black ring is a conductor, its inner surface area is 0.01 m^2. The magnetic field points upward, B = 4T. 2. The attempt at a solution I understand what I have to do, but I'm getting the wrong +/-...
  30. L

    How do I find the direction of C?

    Homework Statement A shell of mass 12 kg moving horizontally at 320 ms^ -1 explodes into three fragments A,B and C, which continue to move in a common vertical plane. Fragment A: mass 2 kg continues at 450ms^-1,45 degree angle above the horizontal. Fragment B: mass 6kg continues at 400ms^-1...
  31. Y

    Simple Harmonic Motion in x direction

    Homework Statement A simple harmonic oscillator, with oscillations in the x direction, has velocity given by: $$v_{x} = (2.2 \frac {\mathrm{m}} {\mathrm{s}}) \sin [(6.9 \frac {\mathrm{rad}} {\mathrm{s}}) t]$$. Find the values of ##\omega , A, f , T ,## and ##\phi## Homework Equations $$v_{x} =...
  32. Richie Smash

    Find the speed of the batsman and direction he takes (vectors)

    Homework Statement Hello, I havre problem here relevant to an image I will attach. ''A cricket ball hit by a batsman moves with a speed of 6m/s along a straight line path PQRS, as shown in the diagram. When the ball is at R, a fieldsman starts to run in a straight line from T with a speed of...
  33. Richie Smash

    B Direction of the force on a conductor in a solenoid

    Hi I have attached a picture here, of a solenoid with a copper block connected to a battery suspended in it. The current moving is clockwise, So the magnetic poles would be as shown. Now my problem always is this, I get so confused with this, I used Fleming's left hand rule to find the...
  34. Decimal

    How to find the direction of wave propagation

    Homework Statement Given the following expression $$ \Psi(x,t) = A cosh(36 x^2 - 12 x t + t^2)$$ Determine whether this is a traveling wave and if so what is its propagation velocity and propagation direction? Homework Equations Wave equation $$ \frac {\delta^2 \Psi(x,t)} {\delta x^2} =...
  35. jan2re

    Principal stresses 3D, solving for direction cosines n1,m1,n1

    Homework Statement -4.882L1+M1+2N1=0 L1-2.882M1=0 2L1-0.882N1=0 L1^2+M1^2+N1^2=1 How to solve for L1 ,M1 and N1 ? 0<L1,M1,N1<1Homework EquationsThe Attempt at a Solution
  36. M

    Calculating direction derivative to a line in 2D

    Homework Statement Compute ##\partial_n f## where ##n## is normal to ##f##, and ##f## lies in the ##x-z## plane and is parameterized by $$x(s) = \frac{1}{c} \sin (c s);\\ z(s) = \frac{1}{c} (1-\cos (c s)) $$ Homework Equations ##\partial_n f = \nabla f \cdot \hat n## The Attempt at a Solution...
  37. DoobleD

    Direction of reflected E field on a dielectric surface?

    When studying Fresnel equations in EM, I very often came across the following type of picture for a s-polarized incident wave on a dielectric interface (http://iqst.ca/quantech/pubs/2013/fresnel-eoe.pdf) : Many similar diagrams can be found on the internet, for instance...
  38. karush

    MHB Eb 4.d determine the magnitude and direction of V

    $\tiny{\\ eb 4.d}$ $\textsf{If $v_x=-9.80$ units and $v_y=-6.40$ units,}\\$ $\textit{determine the magnitude and direction of $V$.}$ \begin{align*}\displaystyle magnitude&=\sqrt{(-9.8)^2+(-6.4)^2} =\color{red}{11.7047}\\ direction&=\arctan{\left[\frac{6.4}{-9.8}\right]}...
  39. Anonymous1135

    Physics Calculating Distance and Direction

    Homework Statement A diver explores a shallow reef off the coast of Belize. She initially swims 90.0 m north, makes a turn to the east and continues for 200.0 m, then follows a big grouper for 80.0 m in the direction 30° north of east. In the meantime, a local current displaces her by 150.0 m...
  40. Mafalda

    Finding the direction of the force knowing the mu static

    1. A crate resting on a rough horizontal floor is to be moved horizontally. The coefficient of static friction is 0.40. To start the crate moving with the least possible applied force, in what direction should the force be applied? a. Horizontal b. 24 degrees below horizontal c. 22 degrees...
  41. F

    I Demo of cosine direction with curvilinear coordinates

    1) Firstly, in the context of a dot product with Einstein notation : $$\text{d}(\vec{V}\cdot\vec{n} )=\text{d}(v_{i}\dfrac{\text{d}y^{i}}{\text{d}s})$$ with ##\vec{n}## representing the cosine directions vectors, ##v_{i}## the covariant components of ##\vec{V}## vector, ##y^{i}## the...
  42. S

    Electrostatics? Magnitude and direction of a magnetic field

    Homework Statement A force of 2.4N is exerted on a -1.8µC charge in a downward direction. What is the magnitude and direction of the magnetic field at this point? (The assignment sheet is called "Electrostatics Questions", hence the "Electrostatics?" in the title) Homework Equations Electric...
  43. S

    Determining Magnetic Field Direction

    Homework Statement If you were to gain a few electrons and go running in Vancouver, what would be the magnitude and direction of the magnetic force that you would experience? Homework EquationsThe Attempt at a Solution So I was able to determine the magnetic force but my only problem is...
  44. N

    Why is the reaction force in this direction?

    I want to understand why the reaction force of the short cable and link cable is in this direction? I want to understand it instead of memorizing. Your help would be much appreciated. Thanks in advance!
  45. S

    I Frame Dragging Direction for Outward Moving Test Mass

    I have the following question considering frame dragging: A test mass starting at rest near a rotating mass or with an initial velocity pointing towards the center of the rotating mass will be deflected in such a way that it begins to move around the mass in the rotational direction. This is...
  46. R

    Direction & magnitude of normal stress

    Homework Statement For the state of stress shown in the figure, normal stress acting on the plane of maximum shear stress is? Homework Equations Normal stress σn = σcos2θ 3. The Attempt at a Solution Plane of maximum shear stress is 45o relative to the max stress of 100MPa. So the total...
  47. R

    Can F_1,2 Be Defined Using r-hat_2,1 Instead of r-hat_1,2?

    In this example (https://imgur.com/a/pTFIt) could i define F_1,2 in terms of r-hat_2,1 instead of r-hat_1,2?
  48. EastWindBreaks

    What is the direction of P relative to A?

    Homework Statement Homework Equations The Attempt at a Solution does Vpa has the same direction as Vp? i thought Vp is tangent to the circular path that point P creates( perpendicular to vector Rpa) but from the figure, Vp doesn't seem to be tangent to the path, but Vpa does...
  49. D

    Magnetic Force -- Confused about the direction of the force

    Homework Statement Homework EquationsThe Attempt at a Solution Hi! I got the magnitude using F=qvB using information from the top of the qs. But the direction is confusing me. I used the Fleming's left hand rule but it sort of isn't giving me the right answer
  50. D

    Magnetic Force direction on a charged particle moving parallel to a wire

    Homework Statement Homework Equations The right hand curl rule gave me the counterclockwise direction for the magnetic field but I am confused about how is it going to work for the particle. Thanks The Attempt at a Solution
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