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. junseok Lee

    I Finding the change in position and angle after moving the rectangle

    I am curious about how to approach the problem mathematically, so I write. There are 4 dots on the square and I know the location. The rectangle moves and the positions and angles of the four points change. I also know the location of the four points that have changed. I don't know the...
  2. A

    Determining the starting position when dealing with an inclined launch

    Now I did what the suggestion said I started my calculation with x(t); x(t) = v0 * cosα * t As I was missing the t component I found it like this t = v0 * sinα/g t = 8,82 s Now I've put t back into x(t) and got this result; x(t) = 441 m Now what I think I have gotten is the complete...
  3. F

    I Why can't we interprete /x> in relativistic QFT as position eigenfunc?

    Why can't we interprete /x> in relativistic QFT as position eigenstate?And by the way what is the difference between /x> and /1x>=Phi(field operator)(x)/0>?
  4. P

    Position for maximum electric field between two wires

    For the first part, since $$ E(r) \propto \frac{1}{r} \hat{r}$$ by the principle of superposition the maximal electric field should be halfway in between the two wires. Then I'm not sure how to go about the second part of the question. I understand that the total potential due to the two wires...
  5. C

    Help finding the equilibrium position of an electric field

    I seem completely lost at this. I barely know where to begin. I know that the forces will sum to 0 but the vectoral nature of the question is really confusing me. Best I have is that the distance between e and q2 has to be sqrt(2) times the distance between e and q1. I don't know where to go...
  6. PainterGuy

    Finding the position of a differential drive robot

    Data: The speed of right wheel is considered to be 25 RPM. The speed of left wheel is considered to be 20 RPM. The distance, L, between wheels is 30 cm. Also the radius, r, of each wheel is 6 cm. Question: Using the data above for a differential robot, find the following: i: angular...
  7. nish95

    Final Image position for a setup with two lenses

    First image is an object for the concave lens so won't +ve direction change from right to left?! In that case, object distance will be -ve (from concave lens towards right side). Any ideas? Solution in the book takes first image's distance to be +ve. See attached ray diagram for clarification...
  8. P

    Position of the object and image in this optics problem

    I know how to solve the problem but the only thing that's bothering me is what is A? According to me A is should be 2F ie 2 times the focal length distance. I thought of it like this: 1. First there will be an image formed due to the lens. 2. The image will be formed below the lens but the...
  9. kolleamm

    B Randomness in electron position

    So from what I understand the position of an electron at any given time is based on a probability model. My question is how does gravity play a role in this model? Can we say the position of the electron is truly random? What if this "randomness" is caused gravitational forces pulling it in...
  10. F

    Finding velocity and position of ##a(t)=−\omega^2(C_1\cos\theta+C_2\sin\theta)##

    this expression : ##a(t) = −ω^2 (C_1 \cos θ + C_2 \sin θ)## I´ve never seen it before, where is it from? It kinda looks like centripetal acceleration, but what exactly are ##C_1## and ##C_2##? Can we calculate its velocity and position? If I´ve got two initial conditions ##x(0)=x_0## and...
  11. tanaygupta2000

    Position and Momentum probability for +x direction

    For the region where V = 0, solving the schrodinger equation leads to the above value of wave function, psi = sqrt(2/L) sin(pi x/L) Since in the qus. it is not stated about the 'direction of movement' only restricted to +x direction, I think that the probability will be 1/2. And finding the...
  12. mcastillo356

    Doubt about the 2nd position vector direction in a particle's movement

    I have not tried to make any calculation. It's nonsense, because I don't understand the statement. The first vector points to the west. Given a two dimensional coordinate system, the first vector is pointing to the left. I imagine geographical coordinates, north (+y), south (-y), west (-x), and...
  13. D

    (Conceptual- Planar Kinetics) How to maintain the position

    Relevant equations : Kindly advise whether this approach is correct, I am not sure whether the friction force should be considered.
  14. tanaygupta2000

    Minimum average value of position

    After getting the values of ψ₀(x) and ψ₁(x), I put them in the expression of ϕ(x) to get: ϕ(x) = (mw/πℏ)^(1/4) * exp[-(mw/2ℏ)x^2] * [α + βx√(2mw/ℏ)] Now when attempting to find the value of <x> by ∫xϕ(x) dx, I am having trouble determining the limits, as I am getting nothing useful by...
  15. O

    I Confusion about position state kets

    I am a bit confused about how kets in dirac notation are working. I read on wikipedia, that kets are linear, so |a*Φ>=a*|Φ>. Also I read (https://ocw.mit.edu/courses/physics/8-05-quantum-physics-ii-fall-2013/lecture-notes/MIT8_05F13_Chap_04.pdf) that this is not true for the position state ket (...
  16. sysprog

    What is your usual sleeping position?

    https://www.hopkinsmedicine.org/health/wellness-and-prevention/choosing-the-best-sleep-position
  17. F

    Calculating velocity from the position versus time graph

    My answers: a) At points d the instantaneous velocity should be greatest since slope of c-d is greatest I think b) At point e and g instantaneous velocity is 0 c) at points b, c, and f instantaneous velocity is negative. Could you please verify my answers?
  18. J

    MHB Find the average force required to hold the gun in position

    A gun fires 6 bullets per second into a target. The mass of each bullet is 3g & the speed of 500 m/s. Find the average force required to hold the gun in position.
  19. LCSphysicist

    Trying to find the equation of position in a circular oscillatory motion

    First of all, i know that the motion will be bounded, is not necessary to know if the motion will be closed or not. Second, by analyzing the graphic of a effective potential with such conditions, the motion will agree with harmonic motion. Ok I don't know how to prove the harmonic oscillation...
  20. Terrycho

    Divergence of a position vector in spherical coordinates

    I know the divergence of any position vectors in spherical coordinates is just simply 3, which represents their dimension. But there's a little thing that confuses me. The vector field of A is written as follows, , and the divergence of a vector field A in spherical coordinates are written as...
  21. R

    I don't know how to get the x-y direction of position P

    Please help me to find the position P and whether it will work in this solution by knowing the position. (The question, my solution and thought in the image)
  22. M

    MHB Method of least square: initial position & velocity

    Hey! :o A point is moving linearly with constant velocity $v$ and the movement is $x=a+vt$. The below information is given: Find the initial position $a$ and the velocity using the method of least square. Could you give me a hint how we use this method here? Couldn't we use the data of...
  23. M

    MHB Determine the position using an iteration method

    Hey! :o The function \begin{equation*}f(x)=\frac{x}{e^{x/9}}\cdot \frac{\sin \left (\pi (x-1)\right )}{x-1}\end{equation*} has at exactly one position $\overline{x}>1$ the same value as at the position $x=1$. Determine the position $\overline{x}$ using an iteration method with accuracy of two...
  24. B

    Angular position for 2nd order diffraction

    Here is my problem I have given this a go and get 26.77 degrees as my angular position My concern is do I double this angle to get the angular width between both 2nd order maxima's (which would be 53.53 degrees) or do I just leave it as 26.77 degrees? Thanks for any help!
  25. cemtu

    I Heisenberg Uncertainty: simple explanation required please

    why can't we know where electron goes after it was hit by light? Light has a travel direction, can't we assume that electron bounces to the same direction that the light was headed??
  26. WrathofAtlantis

    Prop disc thrust uniformity in turns vs wing position

    I would like to know what is the current consensus on the effect of the position of the wing relative to a tractive propeller disc's uniformity of thrust (the focus configuration would be WWII fighters).
  27. F

    Identity involving the vectors for position, velocity and aceleration

    any tip to start?
  28. simo22

    Finding motion where the acceleration depends on position and time

    I have computed that the acceleration in my problem is a(t) = -gj - k/m(|r(t)| - L_0) * r(t)/|r(t)| Where a(t) is the acceleration vector, g is the gravitational acceleration, j is the unit vector in y-direction, k is the spring constant, m is the mass, r(t) is the position vector, |r(t)| is...
  29. Saptarshi Sarkar

    Uncertainty in wavelength and position

    In my attempt to solve the problem, I used the formula for de-Broglie wavelength ##p=\frac h λ## and differentiated both sides to get ##Δp = \frac {hΔλ} {λ^2}##. Plugging this equation into the Heisenberg's position and momentum uncertainty principle formula and calculating the minimum...
  30. N

    Image position in an optical system?

    I have an plano-convex lens with focal length 75 mm. The object is 325mm from the lens. a) Where is the location of the image after the lens? b) Where is the location of the image if an beamsplitter is placed after the lens? My solution, questions: a) a = 325 mm b = ? mm f = 75 mmm...
  31. T

    Position of the fan inside a convergent nozzle

    I want to present two scenarios here. First, there is a convergent nozzle shaped structure having a fan/blower fitted inside. In this case, the fan/blower is fitted at the throat of the nozzle. The inlet to throat ratio isn't important here. And the second scenario, the same nozzle is used but...
  32. D

    Position as a function of energy

    I've seen position as a function of time in Newtonian physics and potential energy as a function of position, is there an inverse? Any instance where position is a function of energy eg KE, PE. Maybe this is more appropriate for quantum mechanics or modern physics.
  33. Y

    How Do You Convert Drone Position Errors into Roll and Pitch Angles?

    Hi guys We have a problem we we are building a flight controller for a drone, but fail to understand how to construct the position controller. It takes the x, y positions and the angle in between them which we call yaw. How to compute the angles roll and pitch for the desired x and y positions...
  34. K

    I How is the information of a change in position of a star transmitted?

    Gravity is the curvature of space time. Stars move relative to each other. How is the information of this change transmitted through spacetime? I have just finished reading "Reality is not what it seems - The journey to quantum gravity" by Carlo Rovelli. (Can the content of a book be discussed...
  35. polytheneman

    What is the derivative of velocity with respect to position?

    I'm reading a book on Classical Mechanics (No Nonsense Classical Mechanics) and one particular section has me a bit puzzled. The author is using the Euler-Lagrange equation to calculate the equation of motion for a system which has the Lagrangian shown in figure 1. The process can be seen in...
  36. E

    Circular Motion/Energy: Find the position of the rings when tension = 0

    Here's my first attempt at a solution: First, I calculated the speed of one ring at the point where the tension would be zero. 3mgr(1-cosΘ ) = (1/2) * (3m) * (v^2). 3m * v^2 = 6mgr(1-cosΘ) Next, since I wanted the centripetal force, I took the result I got and divided by the radius. Fc =...
  37. Alexis2020

    Physics position problem (Block on a flatbed)

    Homework Statement: a flat bed being attached to a notch, the limit on the notch was 1500N, the flat bed was 1200N . The length of the flat bed is 14 m, at 12 m are the tires. How close can you put a 1400N block to the notch before it surpasses the weight limit? Homework Equations: I tired...
  38. S

    Finding the potential energy if force depends on both position and time

    How to find potential energy if force depends on both position of particle and time ? Suppose force is : f(r,t) = (k/r^2) * exp(-alpha*t), k, alpha = positive constants, r = position of the particle from force-centre t = time Is this force a conservative or non-conservative ?
  39. J

    Oscillations: The position is modeled as x(t)=Acos(ωt+ϕ)

    What I have done so far: Since x=A, cos(ωt+ϕ) must equal 1 cos-1(1)=0 so -ωt=ϕ ω=2pi/(1/f)=15.3 ωt=3.7=ϕ
  40. Maslova

    B Position of a particle and photons

    Once I have read that we can’t know a actual position of a particle because to see the particle we need to send photons and when we send photons it colides with the particle and change it’s position. Is this true?
  41. M

    Show that the position operator does not preserve H

    The attempt ##\int_{-\infty}^{\infty} |ψ^*(x)\, \hat x\,\psi(x)|\, dxˆ## Using ˆxψ(x) ≡ xψ(x) =##\int_{-\infty}^{\infty} |ψ^*(x)\,x\,\psi(x)|\, dxˆ## =##\int_{-\infty}^{\infty} |ψ^*(x)\,\psi(x)\,x|\, dxˆ## =##\int_{-\infty}^{\infty} |x\,ψ^2(x)|\, dxˆ## I'm pretty sure this is not the...
  42. W

    Finding a digit in a specific position

    Hi, In another forum someone asked how to find the kth digit of a large prime given in the form ##2^t-1 ## , where t is a 6-digit (decimal) number. I was thinking maybe using some SQL string function , though I am not sure if input strings must be entered explicitly. Can anyone think of some...
  43. G

    To find the equilibrium position of a mass attached to an elastic string

    Hi, can anyone see if I have made an error in answering this simple question, my answer is not the one given in the textbook. Here's my diagram of the system in equilibrium. So the mass has dropped a distance x below the midpoint of PQ: So the forces balance as: T1 = g + T2 So, using...
  44. Negatratoron

    I Uncertainty between position and angular frequency - is this correct?

    Motivation: In my thermodynamics + statistical physics class, we derived the equipartition theorem for ideal gasses using Boltzmann factors, dividing the phase space of a gas particle in position+momentum space into units of size x*p=h based on the quantum nature of the space of states that are...
  45. Arman777

    Finding the position of an image charge

    I am trying to use the Method of images for this configuration, But somehow I don't know where should I put the imaginary charge. I know the on the surface of the conductor the potential must be zero and the imaginary charge should be other side of the conductor but that's all I cay..
  46. D

    Ballscrew position in a scissor mechanism

    Hello, regards to all. I am designing a CNC machine where the table will work as a Z axis. I have found a complication when trying to save space under the table, to avoid set the ballscrew upright I have decided to make a scissor mechanism but I have noticed that when the ballscrew travel 10mm...
  47. Like Tony Stark

    Measuring position and velocity from a non inertial reference frame

    I) For ##A##, the positition is ##\vec r=(0;V_0 . t;0)##. For ##B##, we have ##\vec r_A=\vec r_B + \vec r_{A/B}##, but ##\vec r_{A/B}## is equal to zero because they have the same origin, so the position measured from ##A## is equal to the position measured from ##B## II) For ##A##, velocity...
  48. LarryS

    I Why is position just a label in QFT?

    At the beginning of every course in QFT we are told that, unlike in ordinary QM in which the position variable is a physical observable , the position variable in QFT is just a label. Yet there are areas within QFT where the position variable is treated like a real physical degree of freedom...
  49. F

    I Why is the position of a massive particle not blurred?

    In QM a free micro particle with definite momentum has not definite positions.But why does in classical physics a free particle with definite momentum still have definite positions but not blurred as in QM?(Because we can deduce Classical Physics from QM)
  50. zvjaginsevfan

    How to find the Acceleration when Velocity depends on position?

    This is a homework question from my friend, I found the time but a tough differential equation occurred when I was trying to find accelaration, is there a simple solution for this?
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