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. B

    Finding A Vector Position Function For Projectile Motionh

    Homework Statement A cannon shoots a ball at an angle θ above the horizontal ground. Neglecting air resistance use Newton's second law to find the ball's position as a function of time. (Use the axes with x measured horizontally and y vertically.) Let r(t) denote the balls distance from the...
  2. N

    Vector position, velocity, coordinates and speed

    Homework Statement A particle initially located at the origin has an acceleration of vector a = 5.00j m/s2 and an initial velocity of vector v i = 8.00i m/s. a)Find the vector position at any time t (where t is measured in seconds). (Use the following as necessary: t.) Find the vector...
  3. T

    Position Vector: Homework Solution Needed

    Homework Statement The distance traveled by an airplane flying from San Francisco International airport (SFO) to San Jose International (SJC) is 30 nautical miles 36° south of east. Flying from SJC to Tracy, the plane's displacement is 36 nautical miles 52° east of north. What is Tracy's...
  4. K

    Deriving acceleration from Position vector help

    Homework Statement An object has a position given by r-> = [2.0 m + (1.00 m/s)t] i + [3.0m−(5.00 m/s2)t2] j, where all quantities are in SI units. What is the magnitude of the acceleration of the object at time t = 2.00 s? Homework Equations All I am thinking here is that I can find...
  5. J

    Why do particles have non-zero position amplitude across all space?

    I keep coming across the claim that it is a consequence of the Schrodinger dynamics, that even if one postulates wave-function-collapse, so that the wave-function for a particle is entirely confined within some small region at the moment of collapse, an instant later the wave-function will have...
  6. P

    Troubleshooting a Velocity vs. Time Graph: Position at t=10

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  7. O

    Graphs of acceleration, velocity, position

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  8. U

    Trace of Position and Momentum Operator

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  9. M

    Relativity and Distance Measurement in Physics | PF Community Discussion

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  10. K

    Solve for position given force in a mass-spring system?

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  11. mathwhiz

    Problem dealing with Position and Velocity

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  12. PhizKid

    How to solve for unknown charge position

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  13. J

    Computer Vision - Ground plane position based on image point

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  14. D

    Jerk times velocity cross position

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  15. D

    Finding the Orbit of a Particle with Varying Position Vector

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  16. D

    Position of elevator given velocity vs time

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  17. Philosophaie

    Solving Kepler Problem for 2-Body System: Velocity & Position

    How do you solve the Kepler Problem for a 2-body system where m1<<m2 with a given velocity and position vector resulting in a new velocity and position for a certain time interval?
  18. M

    Momentum, position vector dot (scalar) product action

    momentum, position vector dot (scalar) product "action" Hello, I was playing with single mass point classical mechanics, when I realized that the dot product of the position vector and momentum vector, p.r , has action dimension. Furthermore, its time derivative, d/dt(p.r) = F.r + p.v, has...
  19. J

    Momentum information from position space wave function

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  20. G

    Displacement on a Position vs. Time Graph

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  21. D

    Position of holes in p-type semiconductors

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  22. Philosophaie

    How Does General Relativity Affect Star Orbits Around Schwarzschild Black Holes?

    I would like to have a Star orbiting a Schwarzschild Black Hole if the the velocity and position vectors in the galaxy are given. The only thing that comes to mind is the Newtonian method. The velocity and position vectors of the Star are: v = {v_x, v_y, v_z) r = {x, y, z) where (no...
  23. O

    How can we determine velocity from a position-time graph without using calculus?

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  24. karush

    MHB Find the position vector of P

    The vector equations of two lines are given below $r_1=\pmatrix {5 \\ 1}+2\pmatrix {3 \\ -2}$, $r_2=\pmatrix {-2 \\ 2}+t\pmatrix {4 \\ 1}$ The lines intersect at the point P. Find the position vector of P this being in form of r=a+tb where a is the the position vector and b is the...
  25. D

    Hawking's Position on Repeating Big Bang

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  26. D

    Potentetiometer - position of slider

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  27. A

    What position does lonepair of electron takes?

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  28. D

    MHB Where can I find info on the partial derivative of elastic energy wrt position?

    I've been studying a version of the finite element method. The author of a paper I was reading refers to the partial derivative of total elastic energy wrt position, partial derivative of surfacic energy wrt position, and partial derivative of strain wrt position. Does anyone know of a good...
  29. A

    Interchanging a position between two reference frames?

    \vec{r}_a is a positional vector from reference frame a. What is the position of same point from reference frame b ? If required, assume position of origin of frame a is \vec{m} and unit point (i.e. \langle 1,1,1\rangle_a ) is \vec{n} from reference frame b. I am studying Kleppner and Kolenkow...
  30. S

    What does position entangled mean?

    what does position entangled mean (physically)? The below is an attempt to understand position entanglement. It may require a lot of corrections and modifications. Look forward to your responses. A photon (A) would have a probability distribution, so would it's entangled twin/photon (B). The...
  31. mathmaniac1

    MHB Position time graphs for different acceleration

    How can I draw the position time graph for uniform acceleration? a)positive b)negative and for non-uniform acceleration? How would these look like
  32. Philosophaie

    Formulating Position Vector with f(t)

    How do you formulate the Position Vector: x^m = [t____x____y____z] x^m = [f(t)____ax/2*t^2 + vx*t + x0____ay/2*t^2 + vy*t + y0____az/2*t^2 + vz*t + z0] dx^m / dt = [df(t) / dt____ax*t + vx____ay*t + vy____az*t + vz] What do you put in the"t" position "f(t)".
  33. K

    The Uncertainty Relation for Position and Momentum

    Homework Statement The position of a 60-gram golf ball sitting on a tee is determined within +- 1μm. What is its minimum possi- ble energy? Moving at the speed corresponding to this kinetic energy, how far would the ball move in a year?Homework Equations ## K\geq\dfrac {\hbar ^{2}} {2ma^{2}}...
  34. R

    A quantum particle which is almost at rest but whose position is rando

    I had posted this question here : http://physics.stackexchange.com/q/69003/540 I guess its appropriate to post links in here as question. This question is really puzzling me and any suugestion/comments are much appreciated and welcome.
  35. D

    Accurate position change for accelerating objects

    If an object is subject to different forces at different times and these forces are totally unpredictable (the force at any instant after the current time cannot be predicted). How would we make the position change due to acceleration as accurate as possible? I have chosen a method but I've...
  36. J

    Quantum Zeno effect for position measurement

    Hello, The quantum zeno effect is well understood and experimentally confirmed as regards polarization measurements (as discussed here). It's the quantum analogue of "the watched pot never boils" as it allows "continuous" measurement to inhibit certain state evolutions. Does the effect...
  37. M

    Wavefunction after position measurement

    Suppose I have a particle confined between 0 and d on the x axis, and it has some wavefunction, if I measured the particle to be between some small interval [a, b], would the wavefunction collapse into a rectangle-like function with equal prob. density on the interval and zero outside? or what...
  38. S

    Superposition of macroscopic position states

    How is see by our senses a superposition of sensorially distinghible states in superposition, for example, superpositions of states with the same object with a separation of ≈1 cm??
  39. S

    Griffiths Chapter 10 del cross position vector

    I am working through chapter 10 of Griffith’s electrodynamics (for fun and in my spare time). While I don’t have a formal bucket list, getting to an understanding of how Newton’s third law is not as straightforward for electrodynamics has been on my mental bucket list. I am an engineer not a...
  40. B

    [DYNAMICS] Acceleration as a function of position.

    Homework Statement Initial velocity = 17 m/s Radius of curvature = 13 m Acceleration as a function of position = -0.25s m/s^2 Time elapsed = 2 s Solve for the magnitude of the acceleration. Homework Equations a = v (dv/ds) a^2 = a(t)^2 + a(n)^2, wherein a(t) is tangential...
  41. 7

    Definition of a wavefunction as a function of position.

    Hello i wonder if anyone here can explain to me, why the wavefunction as a function of position is defined like this: $$\Psi(x,t) = \langle{x}|{\Psi(t)}\rangle$$ Why is it wise to use an inner product as a definition?
  42. L

    Tips for summer research position interview.

    To my delight I was just called in for an interview for a summer position at a big research institute in the UK, as a graduating physics senior (advertised for undergrads). It's been a while since I last had a job interview and I've never had one at the professional/academic level, I would like...
  43. A

    Accelerometer and calculating position, angle,time

    I am working on a project where we will use a 3-axis accelerometer on the door and using the ax, ay, az data to calculate position and angle of the door. The accelerometer will be positioned near doorhandle. So the initial position of coordinate system will be there, where the accelerometer is...
  44. S

    Position velocity equation free response

    Homework Statement A partcile starts att he point (1,0) and t=0 and moves along the x-axis so that at time t≥0 its velocity v(t) is given by v(t)= \frac{1+ t}{(1+t^2)} A) Determine the maximum velocity of the particle. B) Find an expression for the position s(t) of the particle at time t...
  45. S

    MHB What is the geometric basis of the method of false position (Regula Falsi)?

    On what geometrical construction is the method of false position (Regula Falsi) based?
  46. D

    Mars Retrograde Motion in 2009

    How can I determine Mars' orbital position in February 2009? Is there a website that tracks past positions? By position, I want to know where in its rotation around the Sun it was radians or degrees.
  47. C

    Position of proton and electron to create electric field

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  48. D

    Calculating Uncertainty in Position for Scientists

    I have a problem which asks me to calc uncertainty in position..with the help of uncertainity in wavelength, energy n mass all given?? How do I approach to this..?
  49. J

    First interview for a high school physics teaching position tomorrow

    So, after quitting my physics Ph.D grad program last semester, I got my physics teaching license with the aim to be a high school teacher. Teaching and tutoring were my favorite things in undergrad and my one semester in grad school, so I've decided to do it for a living. I have a few months of...
  50. C

    Calculating object position with non-constant speed

    The problem (long story short) to use an analogy... if I stand here, and then immediately run 5mph for an hour, after 30 minutes I have run 2.5 miles. But if I instead linearly drop from 5mph to 1mph over the course of that hour, where do I stand after 30 minutes? The speed is linear so I...
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