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.
I'm trying to make a simple HTML page that has a few elements. The problem is that when I zoom in using the mouse wheel and holding down Ctrl everything starts to go all over the place and it just looks completely mixed.
I tried to find solutions to this but have had no luck so far.
I want my...
I understand that the Fourier transform to obtain the representation of a wavefunction in k space is
$$ \phi(k) =\frac{1}{2\pi}\int{dx \psi(x)e^{-ikx} } $$
and that $$p=\bar{h} k$$
But why then is $$\phi(p) =\frac{\phi(k)}{\sqrt{\bar{h}}} $$
Many thanks in advance :)
First term of the progression is 3 & the common difference is 4
Find the sum of the first 20 terms of the progression that is obtained by removing the terms in the even positions of the given progressions, such as the second term,fourh term, sixth term.
Formula preferences
For the sum of an...
Homework Statement
http://imgur.com/a/FDfAp
What is the phase constant?
Homework Equations
x(t) = A*cos(ωt+Φ)
The Attempt at a Solution
If I'm not mistaken at t = 0 the graph starts at half the amplitude or 5. Also the amplitude of this graph is 10, and at t = 0 angular velocity is also 0.
5...
How much force is required to turn the front wheel of a 4 wheel robot that weighs 200lb. Assume the wheel is 6inches wide, has a diameter of 12 inches (rubber). I would like to know how much force is required to turn a single wheel left or right when it is in stationary (non-moving) position...
Homework Statement
An object is moving in a straight line with a constant acceleration. Its position is measured at three different times, as shown in the table below.
Time (s) | Position, (m)
48.40 | 9.100
49.80 | 17.479
51.20 | 32.816
Calculate the magnitude of the acceleration at t=49.80 s...
Homework Statement
Bead on spoke:
constant speed ##u## along spoke
it starts at center at ##t=0##
angular position is given by ##\theta=\omega t##, where ##\omega## is a constant
Homework Equations
## \frac{d\hat r}{dt} = \dot \theta \hat \theta ## (1)
## \frac{d\hat \theta}{dt} = -\dot...
Homework Statement
Find the amount of work done between points x1 and x2.
Force at x1: F=ax1
Force at x2: F=ax2
Homework Equations
F=ma
W=F (dot product) S
The Attempt at a Solution
W=ax2*(x2-x1)
Hi!
I don't know if I'm in the right forum of this site but I'm trying anyway. I was just wondering if someone could explain how the step- and impulse response is related to an angular position (of e.g. a spacecraft )? Just a little about the theory since I am trying to actually understand...
Homework Statement
What is the final position of the object if its initial position is x = 0.40 m and the work done on it is equal to -0.19 J?
Homework Equations
work(J)= Fx ΔX
The Attempt at a Solution
I do not know where to begin? please give me a hint where to begin.
I am wondering about the minimum possible uncertainty (standard deviation) in an electron's position (Δx). How precise can one know the electron's whereabouts without creating other sorts of particles and phenomenons.
I know of the localization energy interpretation of the energy uncertainty...
Homework Statement
The position of an object that is oscillating on an ideal spring is given by the equation x =
(12.3 cm) cos[(1.26s-1)t]. At time t = 0.815 s,
(a) how fast is the object moving?
(b) what is the magnitude of the acceleration of the object?
Homework Equations
As follow
The...
$\tiny{205.o27.12 }$
$\text{Given the velocity $v=\frac{ds}{dt}$}$
$\text{and the initial position of a body moving along a
coordinate line,}$
$\text{find the body's position at time t}$
\begin{align}
\displaystyle
v&=\sin\left({\pi t}\right) &s(0)&=20 \\
v'&=\cos{(\pi t)} \\
s(t)&=...
Homework Statement
Prove that ##[L_i,x_j]=i\hbar \epsilon_{ijk}x_k \quad (i, j, k = 1, 2, 3)## where ##L_1=L_x##, ##L_2=L_y## and ##L_3=L_z## and ##x_1=x##, ##x_2=y## and ##x_3=z##.
Homework Equations
There aren't any given except those in the problem, however I assume we use...
i am having a hard time understanding why do we place the brushes on the Magnetic neutral axis, the textbook simply says, because this is where the current reversal takes place, is the point where emf from different meet is the same as the point of current reversal?
Homework Statement
The figure shows a two-ended “rocket” that is initially stationary on a frictionless floor, with its center at the origin of an x axis. The rocket consists of a central block C (of mass M = 6.40 kg) and blocks L and R (each of massm = 1.90 kg) on the left and right sides...
I've made a drawing in order to visualize the problem better:
1. Homework Statement
A car can increase its speed only at 3.00 m/s2, move at constant velocity, or decrease its speed at 7.00 m/s2. Starting at rest, the driver wishes to drive to a road sign located at x=100 m. He increases his...
What are the chances of getting an Entry-Level Electrical Engineering job 3 years after I graduated? I had a 3 year gap because I was getting my teaching degree. However, I did stay current with electrical engineering fundamentals / knowledge during those years.
Homework Statement
An object of 5 kg is acted on by a force and moved from 0.5 to 2.0m.
How much work does the force do?
As the object moved, friction with a coefficient of 0.2 also acted upon it. What is its final speed if it started at rest?
Homework EquationsThe Attempt at a Solution
So...
Homework Statement
A force of 10 Newtons can stretch a spring by 0.04 m. Suppose a mass of 5 kg is attached to the lower end of the spring. We stretch the mass downward by 0.05 m from its equilibrium position and release it from rest. Determine the position of the mass relative to its...
Homework Statement
My homework problem is a proof in orbital mechanics, but I'm not looking for specific help on that just yet, I'd like to work through it on my own. In doing so however, I'm having a hard time conceptualizing the idea of derivatives of vectors at a specified time. If r is a...
Hello,
My question is probably geared towards the professors or postdocs reading this forum and concerns the recruitment aspect of the professors in the US.
I am a European physics student currently visiting a "top" Californian university. During this short visit (8 months) I have come to...
What is the relation between the correlators ##\langle 0 | T\phi(x_{1})\phi(x_{2}) | 0 \rangle## and ##\langle 0 | T\phi(p)\phi(x=0) | 0 \rangle##?
I can derive the momentum space Feynman rules for ##\langle 0 | T\phi(x_{1})\phi(x_{2}) | 0 \rangle##. Are the momentum space Feynman rules for...
A particle's position is given by $$r_i=r_i(q_1,q_2,...,q_n,t)$$ So velocity: $$v_i=\frac{dr_i}{dt} = \sum_k \frac{\partial r_i}{\partial q_k}\dot q_k + \frac{\partial r_i}{\partial t} $$
In my book it's given $$\frac{\partial v_i}{\partial \dot q_k} = \frac{\partial r_i}{\partial q_k}$$...
Homework Statement
Compute ##\displaystyle{\int\ \frac{d^{4}p}{(2\pi)^{4}}} \frac{i}{p^{2}-m^{2}+i\epsilon}e^{-ip \cdot{(x-y)}}## in terms of the invariant interval.
Interpret your answer in the limit of small and large invariant intervals and for zero mass.
Homework Equations
The Attempt...
I could completely understand the fact it it was just a limit to our observations but how can it be a property of the microscopic particle itself? Here's how I understand about probabilities:
Before a die is thrown, the probability of a certain number coming up is 1/6. But, it's before the die...
I have a problem where I need to figure out the initial velocity vector \vec{v_0} of a projectile, in order for it to land at the final position \vec{r_f} = x_f\hat{x} + y_f\hat{y} + z_f\hat{z}, from initial position \vec{r_0}.
___
The only knowns in the problem are \vec{r_0} and \vec{r_f}...
Homework Statement
if displacement is the shortest distance between two point then that would also meant that it is equivalent to the hypotenuse when using phytogaras theorem right?. but why isn't displacement the shortest length between two point ?because Xinitial - Xfinal couldn't posibly be...
Homework Statement
Finding yourself in a nearly empty airplane, you take a seat other than your allotted seat. Soon, an air hostess comes up to you and requests you to occupy a different seat.
What may be the reason?
A) The plane momentum can change if the passengers change their position...
Homework Statement
FInd the angle theta between AB and AC. a-1.7m, b=1.3m
masteringengineering.com says my answer is wrong. I'm not sure of any other way to do the problem. Please advise.
Homework Equations
A(3, 0, 0) B(0, -.75, 1.3) C(0, 1.7, 1.5)
The Attempt at a Solution
r(AC)=...
Hi!
I hope I'm posting in the correct section. I found this very similar topic in this forum: https://www.physicsforums.com/threads/orbital-ellipse.482713/
Aside from very helpful formula for calculating semi-major axis, the question was left unanswered.
I have a working simulation of...
Homework Statement
The position function of a projectile is given by r(t) = (5t + 6t2) m I + (30 - t3) m j. What is the displacement of the particle in magnitude angle form at the = 2.0 seconds.
Homework Equations
√x2+y2
tan-1 = y/x
Possibly: x = v0t + 1/2at2The Attempt at a Solution
[/B]
I...
hi, initially I want to put into words that I looked up the link (http://physics.stackexchange.com/questions/86824/how-to-get-the-position-operator-in-the-momentum-representation-from-knowing-the), and I saw that $$\langle p|[\hat x,\hat p]|\psi \rangle = \langle p|\hat x\hat p|\psi \rangle -...
In most situations in QM we would get a quantized energy basis, that is a countably infinite basis ( I think it's called having a cardinality of aleph 0), In the meanwhile we take the position basis to be continuous ( cardinality of aleph 1?) and I'm pretty sure that there is a theorem stating...
Say a particle was measured to be at a point C. Immediately after this, if i make another measurement, its given in griffith's book that the particle will still be found at C. Isn't this only possible if the particle was at rest?
Homework Statement
Two particles 1 and 2, each carrying 6.0 nC of charge, are located along an x axis, one particle atx=−30 mm and the other at x = 30 mm. Where along the y-axis is a particle 3 carrying a charge of +2.0 nC if it experiences an electric force of 6.9 × 10^−5 N ȷ^?
Homework...
In a closed water heating system with a heat exchanger as the primary heat source (district heating), should the circulator ideally be installed before or after the heat exchanger? Is one or the other better for the exchanger itself?
My textbook (on celestial mechanics) makes a passing reference to position on an ellipse being expressed as:
##r = a(1 - e \cos E)## before moving on to the substance of the chapter. E is the eccentric anomaly, and r is the distance from the focus to the point on the ellipse.
I'm trying to...
Well i am noobie to quantum physics so i matbe totally incorrect so please bear with me.
I had question how is position operator defined mathematically.
I was reading the momentum position commutator from...
I have read that in polar coordinates, we can form the position vector, velocity, and acceleration, just as with Cartesian coordinates. The position vector in Cartesian coordinates is ##\vec{r} = r_x \hat{i} + r_y \hat{j}##. And any choice of ##r_x## and ##r_y## maps the vector to a position in...
Why do we take a particle's position ##x## and its velocity ##\dot{x}## as independent variables in a phase space when they are dependent in the sense that given the function ##x(t)##, we can get the function ##\dot{x}(t)##?
I'm thinking they are independent variables but not independent...
Homework Statement
A particle moves with constant velocity along the curve r = e^(θ) and z = r (cylindrical coordinates). The speed, v, is constant.
a) Calculate the velocity and acceleration of the particle in terms of θ and v.
b) Show that the velocity and acceleration are perpendicular...
It is one more weekend before I get an official answer for my PhD request... I am totally broken (mentally) and stressed as I am the worst-case-scenario person... In the past, this trait of mine made me reach a point where I said "screw it, if it happens it happens"... unfortunately this time it...
I just transferred to a university with quite a few undergrad research opportunities. My goal is to go to grad school for cosmology after my b.s. in physics, which will come with a minor in mathematics and 18 hours of astronomy and astrophysics courses.
My question is, would I benefit from...
Hello!
I'm trying to derive the linear velocity vector from the position vector and the angular momentum vector. I've seen on the internet that V = W x R (V,W and R are all vectors and x is the cross product) but I cannot for the life of me derive it! I've tried doing it by writing out the...
Dear all,
I'm a bit confused about a 2D problem which I thought had a simple solution...
I don't know if I'm correct, so:
I have a 2D space, and time. I know the velocity field v(x,y,t). I would like to know where the particle which start at the position x0,y0 at an istant t0 is at a certain...
While proving the Midpoints of the Sides of a Quadrilateral Form a Parallelogram , I got bogged down with position vectors.
Let a,b,c and d be the position vectors of A,B,C and D. But where is the origin? Aren't we supposed to locate position of origin?
I recently got my B.S. in Physics and began applying to various entry-level analytical jobs. An investment management firm is going to give me a 3 hour test online. The subjects are as follows:
Brokerage Firm Case Study
Excel
Data Proofing
Logic
I feel comfortable self studying vlook ups and...