What is Position: Definition and 1000 Discussions

The missionary position or man-on-top position is a sex position in which, generally, a woman lies on her back and a man lies on top of her while they face each other and engage in vaginal intercourse. The position may also be used for other sexual activity, such as anal sex. It is commonly associated with heterosexual sexual activity, but is also used by same-sex couples.The missionary position is the most common sex position, but is not regarded as the most favoured one. It may involve sexual penetration or non-penetrative sex (for example, intercrural sex), and its penile-vaginal aspect is an example of ventro-ventral (front-to-front) reproductive activity. Variations of the position allow varying degrees of clitoral stimulation, depth of penetration, participation on the part of the woman, and the likelihood and speed of orgasm.
The missionary position is often preferred by couples who enjoy the romantic aspects of ample skin-to-skin contact and opportunities to look into each other's eyes and kiss and caress each other. The position is also believed to be a good position for reproduction. During sexual activity, the missionary position allows the man to control the rhythm and depth of pelvic thrusting. It is also possible for the woman to thrust against him by moving her hips or pushing her feet against the bed, or squeeze him closer with her arms or legs. The position is less suitable for late stages of pregnancy, or when it is desired for the woman to have greater control over rhythm and depth of penetration.

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  1. H

    Simple Harmonic Motion: Position, Velocity, & Acceleration

    Homework Statement A 1.00-kg glider attached to a spring with a force constant 49.0 N/m oscillates on a frictionless, horizontal air track. At t = 0, the glider is released from rest at x = -3.50 cm (that is, the spring is compressed by 3.50 cm). Find the position, velocity, and...
  2. Z

    Help Solving Calculus/Mechanics Question on Particle in Gravity Field

    I'm really struggling to get my head around some of the mechanics applications in my calculus module and would really appreciate it if somebody could help me get my head around it. I have this question: A particle P of constant mass m has a position vector: r=x(t)i+y(t)j, and moves...
  3. L

    How does spin work in the position representation?

    When you have an ordinary (read: spin zero) particle with a quantum state |ψ>, the corresponding position-space wave function <x|ψ> is an ordinary scalar function of position. How do things work when the particle has spin? In that case its quantum state will live in the tensor product of two...
  4. H

    Simple Pendulum: Amplitude, velocity, and angular position.

    θθHomework Statement A simple pendulum of mass 20.0 g is suspended by a length of string 1.0 m. It is pulled from equilibrium so that it's raised 10.0 cm and released. Angular position given by θ(t)=θmaxcos(ωt+∅) What is the period? What is the maximum velocity of the pendulum? What is the...
  5. A

    Physics Would I qualify for a patent examiner position with a BA in physics?

    More generally, what kind of jobs can a person who has a BA in physics qualify for? Because I received average grades in college, I have been trying to apply for any job at this point (from IT entry level help desk jobs to laboratory assistant jobs , to admin office and processing assistant...
  6. M

    The position of a 2.75x10^5 N training helicopter under test is given by

    Homework Statement The position of a 2.75x10^5 N training helicopter under test is given by...? vector r = (0.020m/s^3)t^3ihat+(2.2 m/s)tjhat-(0.060m/s^2)t^2 khat Find the net force on the helicopter at t=5.0s Express your answer in terms of ihat, jhat , and khat . Express your...
  7. A

    Finding angular frequency about the equilibrium position.

    Homework Statement Alright so I've got a potential energy equation U(x) = E/β^4(x^4+4βx^3-8(β^2)x^2) and U'(x) = E/β^4[4(x^3) + 12β(x^2) - 16(β^2)x] (where β and E are constants) that describes a particle of mass m which is oscillating in an energy well. I solved for where the system has...
  8. S

    Infinity optics - position of tube lens

    Hi, I was hoping someone would be able to help me with a microscopy problem that has been puzzling me for a while. I'm building a basic microscope from scratch using a 50x long working distance Nikon objective (LU Plan ELWD, wd = 10.1mm, NA = 0.55). The sample is illuminated from above using...
  9. F

    Position of particle in infinite potential well

    Homework Statement For the case n=1, calculate the probability that the particle is found in within the region a/4<x<3a/4 (n is the energy level, a is the width of the infinite potential well). Compare this result with the case n=8 and with the classical result. Homework Equations...
  10. B

    Give two reasons why the apparent position of the Earth's geomagnetic pole

    Homework Statement Give two reasons why the apparent position of the Earth's geomagnetic pole, as recorded by ancient rocks, may not correspond to its present position. The Attempt at a Solution Continental drift? So what is recorded by ancient rocks is not totally accurate because it...
  11. M

    Deduce primitive lattice vectors from position vector.

    Homework Statement given the following position vector: R = (10n1 + 9n2 + 19n3)(a/10) x + 6(n2+n3)(a/5) y + 2(n3)a z where n1, n2 and n3 are integers Find the primitive lattice vectors. Homework Equations any position vector of a lattice point is of the type R= c1 a1 + c2 a2 + c3 a3; and...
  12. H

    How do you go from a position vs. time graph to a velocity vs. time graph?

    And visa versa. And I'm only in 9th grade, so please don't give me any complicated answers or links. I just want to know simple stuff like, "If there is a straight horizontal line in a velocity vs. time graph, how would that look like on a position vs. time graph?" Basically, I just want to know...
  13. N

    {vectors}find the position vector of this

    Homework Statement a particle traveling in a straight line is located at the point (4, -2, 3) with the speed of 2 m/s at time t=0. the particle moves toward the point (6, 0, 9) with constant acceleration 3i-j+k. find its position vector r(t) at time t The Attempt at a Solution...
  14. S

    Expectation of position in a 2D system

    How does on calculate the expectation of the position operator x in a 2D infinite potential well (in the xy plane)? Do we only work with the Psi to the Hamiltonian in that particular coordinate when finding <Psi|x|Psi>?
  15. I

    Simple work and variable position question

    Homework Statement A one-dimensional force acts on a particle of mass m = 6.26 kg in such a way that its position is given by: x = 0.484t^3 - 33.6t Find W, the work done by this force during the first 1.49 s. Homework Equations W=F*s W=mgs Integration The Attempt at a...
  16. K

    Derivative of kinetic energy with respect to position help

    Homework Statement Show dT/dx = ma Homework Equations T=1/2mv^2 F=ma The Attempt at a Solution dT/dx = d/dx(1/2mv^2) = mv.dv/dx <--------------i believe you use the chain rule. But can someone explain exactly how to get to this step? = mv. (dv/dt)...
  17. I

    Not sure which formula to use Deals with work and position

    Homework Statement A one-dimensional force acts on a particle of mass m = 6.26 kg in such a way that its position is given by: x = 0.484t3 - 33.6t Find W, the work done by this force during the first 1.49 s. Homework Equations F=mg F=ma W=F*distanceThe Attempt at a Solution To find the...
  18. X

    Rectilinear motion (displacement, position) calculus

    Homework Statement A particle has a linearly varying rectilinear acceleration of a=x''i=(12t)i m/s^2. Two observations of the particle's motion are made: Its velocity at t = 1s is x'i=2i m/s, and its position at t= 2s is given bt xi=3i m. (a) Find the displacement of the particle at t=5s...
  19. S

    Dot product of Force and Position as a constant of motion - physical significance?

    Reason I posted this in the maths help forum is that an equation of this form randomly popped up in a homework I was doing on differential geometry. I started with a one-form ω=dβ (β is a scalar function) and found that if for a random vector v, ω(v) = 0, then \frac{d}{dt} \left(...
  20. L

    Why isn't momentum a function of position?

    In quantum mechanics, the Hamilltonian operator is constructed as the infinitesimal generator of the time translation group, which is a 1-parameter group. Yet it can still depend on time. So you have a situation where the generator of a 1-parameter group can depend on the parameter. Yet the...
  21. K

    BJT and graph of charge density over position

    Say you are given the problem of constructing the charge density vs position graph of a BJT(lets take a NPN BJT under equilibrium conditions for example). Now, it is a given as to how a NPN BJT Energy Band Diagram would look like through intuition or a google search. Using only the information...
  22. S

    Velocity from Force position graph

    Homework Statement A 2.40 kg particle moving along the x-axis experiences the force shown, where Fmax=6.41 N, Fmin=-6.41 N, d1=1.77 m, d2=3.54 m, d3=5.31 m, and d4=7.08 m. At x=0.00 m the particle's velocity is 4.54 m/s. What is its velocity at x=3.54 m...
  23. T

    Finding the Position of a Spaceship with Given Acceleration and Velocity Vectors

    Finding a position vector... Homework Statement A spaceship is traveling with acceleration a(t)=<e^(t) , t , sin2t>. At t=0, the spaceship was a origin r(0)=<0,0,0> and had an initial velocity of v(0)=<1,0,0> Find the position of the ship at t=piHomework Equations uhhh... The Attempt at a...
  24. L

    How to graph acceleration vectors on position axis?

    suppose I have two position functions in terms of time. One position function for the x component and the other for the y component. The y component is of constant acceleration. The x component is of constant velocity. How do I represent acceleration on a graph of this type? Here is an...
  25. L

    Position and acceleration vector - parallel and perpendicular

    Position and acceleration vector -- parallel and perpendicular Homework Statement The motion of a particle is defined by the position vector r = A(Cos t + t Sin t) i + A(Sin t + t Cos t) j where t is expressed in seconds. Determine the values of t for which the position vector and...
  26. P

    Vertices position relative to a Quad

    Hi English is not my native language and I have these type of questions all the time. I would like to know if the terms Linked and Opposed are correct when one wants to talk about the position of two vertices relative to a quad for example, as in: "Vertices A and C have an Opposed Relation."...
  27. P

    How to calculate position and velocity?

    I used an online simulation for this lab. Mass: 1.0 kg Force: 1 N X position: – 2 Y position: 0 The final position was 6.0, final velocity was 4.0, and final time was 4.0 At 3 seconds the position was at 2.50 and velocity was at 3.00 Because I used an online simulation I...
  28. A

    Acceleration as a function of position, and velocity.

    If acceleration is a function of position, can you express velocity as a function of position, or would there have to be a time variable? For example, if F = kx = ma, and v0 is given, then a = (k/m)x, so what would the function for v be? I would think that, if you know the acceleration at...
  29. C

    Calculating the Width of a Triangle at Position x

    Homework Statement Given an isosceles triangle - Length = L - Uniform Density = ρ - Width Varies from 0 at x = 0 to a at x = L I attached a picture of it. Homework Equations Have to show the width at position x is given by (a/L)x The Attempt at a Solution Now it is...
  30. R

    A force acts on a particle based on position, determine work. Sign question.

    I have a question about this problem in relation to the way the solution manual handles it. Homework Statement A force Fx acts on a particle of mass 1.5kg. The force is related to the position x of the particle by the formula Fx = Cx3, where C = .50. IF x is in maters and Fx is in...
  31. B

    Acceleration, velocity and position of a rocket

    Hi everyone, Quick question I may just not be thinking right here but I was trying to find the acceleration, velocity, and position of a rocket as a function of time. I started with acceleration: a =\frac{T}{m-\dot{m}t} - g where T is the Thrust, m is the initial mass, mdot is the mass flow...
  32. MartinJH

    Apply for ICT Officer Job: Get HNC Level Training & College Credit

    Hello everyone, I need some help, which I would be very grateful for. My local council, here in the UK, are looking to employ someone who they will train, as well as send the successful candidate to a local college/university to gain HNC level in Information Communications Technology. This is...
  33. N

    CIA Weapon/Science Analyst Position

    Does anyone know anything more about this position other than what is posted on the CIA website? https://www.cia.gov/careers/opportunities/analytical/science-technology-and-weapons-analyst.html
  34. L

    Finding the position vector of uniform circular motion

    Homework Statement Write an equation for one component of the position vector as a function of the radius of the circle and the angle the vector makes with one axis of your coordinate system. Calculate how that angle depends on time and the constant angular speed of the object moving in a...
  35. T

    Velocity and position as functions of time

    Homework Statement Suppose that a neutron with with mass M and initial speed v0 is traveling through a material, such as graphite. As the neutron moves, it makes collisions with atoms in the material, so teh faster it is moving, the more collisions it makes per unit time. Another model of...
  36. C

    How do i determine the final position?

    So i made up this simple setup: I have a √(2) meter stick slanted on a friction-less surface on a 45° angle. And i want to determine the final x and y positions of the points A and B. For point A: A.1) Solving for ax \sum F_x = T_x = F_xTcos(\theta) = ma_xa_x = \frac{Tcos(\theta)}{m} A.2)...
  37. E

    Job Skills Interview prep for lab tech position

    Ok so I have my AA in General Studies, Science Emphasis and I applied for and have scheduled an interview for a job entitled Science Lab Tech out at my local community college where I graduated. I know the interview will be with a commity and I have been told that I won't be able to fake any...
  38. ElijahRockers

    3D Geometry: Calculate the position of the north star

    Homework Statement Ok I'm able to track one star in the sky, over a period of one hour. We use three measurements to find the angle of the arc traced by the star. The three measurements also constitute two vectors. We can take the cross product of those vectors and it will give us a vector...
  39. B

    Finding position from velocity

    Homework Statement Give the velocity v = ds/dt and initial position of a body moving along a coordinate line. Find the body's position at time t. v = 32t - 2, s(.5) = 4 The Attempt at a Solution Here's how the solution manual does it: step 1. v = ds/dt = 32T - 2 step...
  40. S

    Finding the position of an object 1800 years ago?

    I use the planetarium program The Sky quite a bit. It's capable of showing the sky from -4700 years ago to 10000 years into the future. What's the methodology behind this? One giant leap, or small leaps of say 100 years to get there, with some last jump to the final date?
  41. S

    Why do we treat velocity and position as independent in a lagrangian

    I was wondering why when we derive the euler lagrange equations and when we use them we treat x and x dot as independent quantities?
  42. LarryS

    How Does QFT Describe or Predict the Position of a Particle?

    From what little I have read about QFT, apparently the position of a particle is not a observable - it is more like an index for a collection of quantum harmonic oscillators. Thus there is no QFT equivalent to the position probability density in QM. So, how does QFT predict or describe a...
  43. M

    Deriving position from angular velocity on a rotating sphere.

    Homework Statement Consider a rigid sphere of radius 1 and center at (0,0,0) that rotates about its center. The angular velocity is $\omega(t) = (\cos(t) , \sin(t), \sqrt(3))$. Does the path of the point starting at (0,0,1) ever reach this point at a later time? Homework Equations...
  44. L

    Difference between Position Vector & Displacement Vector? (no calculatins)

    Difference between "Position Vector" & "Displacement Vector?" (no calculatins..) http://en.wikipedia.org/wiki/Position_(vector ) http://en.wikipedia.org/wiki/Displacement_(vector ) Is the position vector simply an initial vector given by coordinates (x,y) or (x,y,z) such as (8,4) or...
  45. A

    Post doc position, to call or not to call?

    Hi, So I applied for a postdoc position for a research lab in France. In my cover letter to the PI (who's English) I wrote at the end: "I will call you next week to make sure that you received my CV. Thank you for your time and consideration." I received an acknowledgment of my application...
  46. N

    Do we know the position of the center of the Universe?

    We know that the universe is expanding,but do we know from which point it is expanding outwards?
  47. C

    Position Potentiometer for 3V Across XX

    A circuit has a 10 kΩ potentiometer with a 5 kΩ load. Determine the position of the slider on the ‘pot’ when the voltage across points ‘XX' is 3 V. Think I'm there but not sure of my working out is excessive or I've taken the long route R1 in series with 2 resistors in parallel (R2 and...
  48. nukeman

    Derivative: position, velocity, acceleration as functions of time?

    Derivative: position, velocity, acceleration as functions of time? Homework Statement A 1.00 kg glider attached to a spring with a force constant of 25.0 N/m oscillates on a frictionless, horizontal air track. At t = 0, the glider is passing through its equilibrium position with a velocity...
  49. A

    Orbit to the Moon: nodes position

    Hi everybody, I'm planning a 2016 mission to the moon similar to Apollo 8 (Orbital mechanics homework). I decided to start from a equatorial parking orbit, and then to perform a plane change. The problem is that I obviously need to know the position of the moon's orbit plane, which, as you know...
  50. W

    Position of a Body on a Hyperbolic/Parabolic Orbit with Respect to Time

    .. Using Keplerian Elements Hi. Disclaimer: this is the first foray into orbits I've ever taken. I only did mechanics in university and haven't really touched it sincew. I'm busy coding a simulation of a solar system. I've managed to code a routine to calculate the position of a body along...
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