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.

View More On Wikipedia.org
Recent contents Top users
  1. science_rules

    B The position of a particle/electron question

    When scientists say the position of a particle or electron cannot be known at the same time as its speed, do they mean the particle's position in reference to jumping from energy levels in a single atom, the position in reference to traveling around the nucleus of an atom, or do they mean...
  2. T

    Find time at which position vector points towards origin

    Homework Statement The position vector of a particle at time t is R=(1-t^2)i+(3t-5t^2)j. Find the time at which P is moving (a) towards the origin (b) away from the origin.[/B] Homework EquationsThe Attempt at a Solution I've thought about this for a while but I've come to the conclusion...
  3. redtree

    A Relationship between metric tensor and position vector

    Given the definition of the covariant basis (##Z_{i}##) as follows: $$Z_{i} = \frac{\delta \textbf{R}}{\delta Z^{i}}$$ Then, the derivative of the covariant basis is as follows: $$\frac{\delta Z_{i}}{\delta Z^{j}} = \frac{\delta^2 \textbf{R}}{\delta Z^{i} \delta Z^{j}}$$ Which is also equal...
  4. S

    Problem finding time, position, and velocity

    1. A bicyclist is finishing his repair of a flat tire when his friend rides by at 3.0 m/s. Two seconds later, the bicyclist hops on his bike and accelerates at 2.2m/s^2 until he catches his friend. A) how much time does it take until he catches his friend? B) how far had he traveled in this...
  5. Y

    Position of mass on spring w/o energy equations

    This is not a HW/coursework problem. Just something I randomly thought about. 1. Homework Statement There is a horizontal spring with a mass at the end of it. The mass has an initial velocity V that compresses the spring. Find the equation of motion for this mass without using energy...
  6. Qiao

    Other Recommend research groups for PhD position

    So I've been thinking of continuing after my MSc degree to do a PhD. But I have trouble getting a good feel on research groups of quantum optics and nanophotonics in the world. So my situation is: I life in the Netherlands and I have a good feel on most research groups in the country, but I'm...
  7. Zack K

    Finding time for a particular position of vertically thrown baseball

    Homework Statement A baseball pitcher makes a big mistake and throws the ball straight up. If it reaches a maximum height of 15 m. Find the times when the ball was 8.0 m above the ground. I already solved the variables needed Vi= 17 m/s Time the ball spent in the air= 3.5 s average velocity=...
  8. A

    Position of a coil relative to the magnetic flux

    Does a magnet have to penetrate the plane of a coil in order to generate an emf in the coil? Would an emf be obtained if the coil only passes through the magnetic lines of force, without the magnet crossing the plane of the coil? Thank you.
  9. D

    Position and acceleration graphs

    Homework Statement Find the position and acceleration graphs from the velocity graphs given. Homework EquationsThe Attempt at a Solution I'm pretty sure I've gotten some of them correct but I don't know which one I've done wrong.
  10. Liam C

    B How does the double slit experiment prove super position?

    I know this question has been asked before but I have only found threads for it at an undergraduate's level of understanding and I am just finishing ninth grade. How does the double slit experiment prove superposition? What led me to ask this question, was that, since when you close one slit the...
  11. Omega0

    B Jupiter Red Spot Position and more

    Hi, I would be interested in the position and the "appearing" of Jupiters red spot over many decades. Here the first question is: What would be the best coordinate system? Jupiters axis of rotation is very stable. So the latitude would be very interesting in my eyes. But: How do we define the...
  12. avito009

    Is angular momentum position specific?

    Do we find out angular momentum for an object from a specific position? Since L= r x mv. R is the distance from the centre of mass. So can I say that angular momentum is 12 for a fixed position 4 metres away from centre of mass having mass of 1 kg and velocity of 3 metres per second north?
  13. Q

    Predicting Position for velocity time graph

    Homework Statement Homework EquationsThe Attempt at a Solution I honestly have no clue as to how to go about this question. Am i supposed to find the area under the curve? but how do i do that without y-axis numbers. am i supposed to look at the slopes?
  14. Q

    Curves on a Position time graph

    Homework Statement Homework EquationsThe Attempt at a Solution I knew the answer was between A and B, but the inward curves and outward curves on the position time graph confused me , what exactly does it mean? -does A have an increasing velocity and then B has a decreasing velocity? I am...
  15. bill222

    Calculate position of plate between two fluids

    Homework Statement Problem is as shown in the picture. The answer is meant to be a 4.59mm. Homework Equations Tau=mu(du/dy)The Attempt at a Solution Force (tau) acting on plate from both fluids is equal, as is velocity (du). mu1 (du/dy1) = mu2 (du/dy2) mu1/dy1 = mu2/dy2 (mu2/mu1) *y1 = y2...
  16. Jenab2

    I Position and Velocity in Heliocentric Ecliptic Coordinates

    There have been many questions on this forum about celestial mechanics in general, and concerning position and velocity in an orbit in particular. So I offer this post as a summary and reference. Here's a method for finding heliocentric position and sun-relative velocity in ecliptic coordinates...
  17. A

    Position of electron motion 2D

    Homework Statement consider an electron traveling away from the origin along the x-axis in the xy plane with initial velocity vi= viî. As it passes through the region x = 0 to x = d, the electron experiences acceleration a = axî + ayj, where ax and ay are constants. For the case vi = 1.80 ✕...
  18. A. Neumaier

    B Position of a harmonic oscillator

    Here is the new thread. Please justify your criticism of my statement.
  19. M

    How to interpret the equation of position with constant acceleration?

    x = x0 + v0 * t + 1/2 * constant acceleration * t^2 So this is supposed to be very very simple physics, but I still feel like there's a part of this equation I don't fully understand. The first term is the initial position of the body at t=0. The second term is the initial velocity at t=0...
  20. R

    Force vs Position Spring Graph Discrepancy Question

    I oscillated a spring attached to a force sensor above a position sensor. The position and force sensors were zeroed at the spring's equilibrium. The graph below was my result. I'm wondering as to why the graph isn't a perfect line. It makes sense that the force applied on the force sensor would...
  21. S

    Why do conservative forces MUST depend on the position?

    ...Or do they? I read on a book a few years ago that you can spot a conservative force seeing if it depends on the position or not. That means a non conservative force doesn't depend on the position. What is the physical reason for the relationship between a force being conservative and the...
  22. C

    Acceleration, Velocity and Position

    Homework Statement Can anyone verify if I am interpreting and converting the different graphs correctly? I believe that I am on the right track but would really appreciate some confirmation. Thanks! All help is very much appreciated! Homework Equations N/A The Attempt at a...
  23. A

    Distance from an initial position that two objects will meet

    Homework Statement 40kg girl and 8.4kg sled are 15m apart on the surface of a frozen lake. By means of a rope, girl exerts a horizontal force of 5.2N on the sled, pulling it towards her. How far from the girls initial position do they meet? Homework Equations f=ma The Attempt at a Solution I...
  24. S

    Estimate the uncertainty in electron's position.

    1. Question The speed of an electron is known to be between 6.0×10^6 m/s and 6.7×10^6 m/s . Estimate the uncertainty in its position. Homework Equations ΔpΔx ≥ h/2π (mΔv) Δx ≥ h/2π (Since Δp= mΔv) Δx≥ h/2π(mΔv) h= 6.63*10-34 J*s c= 3.0*108 mass of electron= 9.11*10-31 The Attempt at a...
  25. S

    Finding position coordinates from given force vector

    1. A particle of mass m initially at rest at the origin is acted upon by a force (vector) F = xi+yj+zk. Its position vector after t seconds areI need instructions on solving this
  26. O

    Electrical position feedback for hydraulic servomechanism

    Homework Statement Assume that you are employed by a company that manufactures hydraulic servomechanisms. You have been asked to recommend an electrical method of providing position feedback rather than the mechanical method used at present (pictured below). The demand signal has been chosen...
  27. S

    How to Integrate to find velocity as a function of time

    Homework Statement dv/dt = -βv Integrate to find velocity as a function of time, assume the particle's initial velocity is v0. β is constant v = velocity (not constant) t = time Homework EquationsThe Attempt at a Solution dv = -βvdt ∫dv = -β∫vdt --------> limits of integration for the right...
  28. H

    Relation between position vector and velocity vector

    The equation following (3.80) seems to suggest that the velocity vector ##\vec{\dot{r}}## must always be parallel to the position vector ##\vec{r}##. But clearly this is not true as a particle's velocity can be in any direction. What's wrong?
  29. Z

    Find the displacement from the equilibrium position

    Homework Statement Find the displacement from the equilibrium position of the particle that is in the distance x=£/12 from the wave source, for the moment t=T/4. The amplitude of the wave is A=0.2 m Homework Equations x=A*cos(wt)=A*cos2*pi/T* t The Attempt at a Solution x=£/12...
  30. F

    Position of Object Dropping from 100 ft: t=0, x=0?

    Homework Statement for part b , why when t = 0 , x= 0 , why not x =100 ? the author gave that the object drop from height of 100ft at the start of the question. Homework EquationsThe Attempt at a Solution
  31. P

    Finding total distance on a position vs time graph

    I feel terrible for even having to ask this. I'm doing A2 at the moment, and we've gone through these sorts of lessons ever since my early AS days. I'm trying to review my notes cos exams are coming soon and I did some questions, and I'm apparently doing them wrong with what the answers are...
  32. I

    Position representation of coherent state and time evolution

    Homework Statement I ended up solving the problem as I was typing it up, I am posting what I did anyway as it took so long to type and might be useful to someone else. I am trying to figure out the position representation of a coherent state and it's time evolution. I should be getting a...
  33. M

    I Position of Fermi Energy for Semi-Conductors

    what i mean exactly what is the position of Fermi energy for semi conductor materials 1- at the highest of valance band 2- at the mid-way in energy gap like Fermi level at 0 K
  34. heartshapedbox

    Determining equilibrium position between two springs

    Homework Statement see attachment ***indicates correct answer Homework Equations F=ks The Attempt at a Solution I do not understand how this works, and I haven't been able to find any examples of this.
  35. A

    I Effective mass position dependent

    I have some trouble understanding what to do when the effective mass in a heterostructure depends on position. Suppose for example that you have two materials, which are put together such that in one region the kinetic energy is described by one effective mass and in the other region another...
  36. S

    MHB Finding Lagrangian description of position from Eularian velocity description

    \infty
  37. G

    MHB Finding the Position Vector of Point $B$ on a Line Segment Between $P$ and $Q$

    Let $P = (1,2,-1)$ and $Q = (3,1,0)$. A point $B$ lies on the line segment between $P$ and $Q$. Given that its distance from $P$ is twice its distance from $Q$. Find the position vector of $B$.
  38. sa1988

    Quantum harmonic oscillator most likely position

    Homework Statement Part d) of the question below. Homework Equations We are told NOT to use the ladder technique to find the position operator as that's not covered until our Advanced Quantum Mechanics module next year (I don't even know this technique anyway). I emailed my tutor and he...
  39. CameronRose

    Amplify Position Sensor Circuit

    Hi everyone, I'm working on a college project this year about mountain bike suspension damping. By trade I'm a mechanical engineer however, I'm required to construct a simple sensor circuit to monitor the performance of the damper I am making. Forgive me if my wording or logic is not quite...
  40. gfd43tg

    Getting an entry level position

    Hello, I recently graduated with my BS in Chemical Engineering, and for the past couple months I have been trying to get my first entry level position and haven't found anything. I've applied online (so far I'm sitting at about 60 applications) and I keep an excel spreadsheet with the company...
  41. O

    Finding time when you have initial velocity and position

    ***Sorry I meant to say finding time when you have initial velocity and position*** 1. Homework Statement A test rocket is launched by accelerating it along a 200.0-m incline at 1.36 m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal...
  42. JoAstro

    Crab Nebula Age Estimation - Angular Position Problem

    Homework Statement Hi, I am trying to use the angular velocity and angular position to find the age of the Crab Nebula but my calculations seem to be erroneous. I am supposed to get a number around 800 but I keep getting 5000+ years of age. I'm going to try to be very specific in what I'm...
  43. G

    Harmonic oscillator positive position expectation value?

    So this is something that troubled me a bit- in Shankar's PQM, there's an exercise that asks you to find the position expectation value for the harmonic oscillator in a state \psi such that \psi=\frac{1}{\sqrt{2}}(|0\rangle+|1\rangle) Where |n\rangle is the n^{th} energy eigenstate of...
  44. ognik

    How to Understand Position Uncertainty in Quantum Mechanics?

    Homework Statement I don't understand how the following works:Homework Equations I follow ## \Delta \nu_0 = \frac{\hbar }{2 m \Delta x_0} ## easily, but then ## \Delta x = \frac{\hbar }{2 m \Delta x_0} t ## ;leaves me puzzled - I understand multiplying through by t, but how does ## \nu_0 t =...
  45. C

    Find the position of a pendulum as a function of time?

    Homework Statement How do you find the position of a pendulum as a function of time? Mass of bob: 2.0kg String length (l): 3.0m The pendulum is displaced as a distance of 0.35m from the equilibrium point and is then released. After 100 swings the maximum displacement of the pendulum has been...
  46. C

    How do I evaluate <x> with the k-space representation?

    Homework Statement Given the following k-space representation of the wave function: Ψ(k,t) = Ψ(k)e-iħk2t/2m use the wave number representation to show the following: <x>t=<x>0 + <p>0t/m <p>t=<p>0 Homework Equations <x>=∫Ψ*(x,t)xΨ(x,t)dx <p>=∫Ψ*(x,t)(-iħ ∂/∂x)Ψ(x,t)dx The Attempt at a...
  47. heartshapedbox

    Finding future x position with changing velocity

    Homework Statement At what time in the future will the x-component of the masses position be at 0m? Homework Equations x=x,initial+(integral0,t)(v,xcomponent)(dt) The Attempt at a Solution The solution is 3.1 seconds... not really sure where to start :(
  48. heartshapedbox

    Taking the derivative of position to get velocity

    Homework Statement The problem is hopefully attached, I had to take a screen shot. Homework Equations I understand the process of taking the derivative of position to get velocity. *refer to derivative rules... for example r(x)=2x^2-6x+8 therefore r`(x)=4x-6 The Attempt at a Solution I am...
  49. O

    Finding velocity, time, and distance

    Homework Statement A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves in a straight line...
  50. Maor Hadad

    Position of a train engine (Locomotive)

    Hi, I have a question about where's the most efficient place for a train engine - Let's say a train has to do a some route back and forth, the route has curves and positive and negative slopes. In real life - What's the best position for the enginge? My intuition says it will be most efficient...
Back
Top