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've noticed on a/c with only two wing mounted engines that they tend to be closer to the fuselage than the wing tip. There must be some reason for this, and so I guess my question is why? Does having them farther out on the wing create too much stress? I would assume if a/c manufacturers could...
Homework Statement
"A particle moves in the horizontal plane that contains the perpendicular unit vectors i and j. Initially it is at the origin and has velocity 18ims^-1. After accelerating for 10 seconds its velocity is (30i + 8j)ms^-1. Assume that the acceleration of the particle is...
A vertical cylindrical container contains some helium gas that is in thermodynamic equilibrium with the surroundings. The gas is confined by a movable heavy piston. the piston is slowly elevated a distance H from its equilibrium position and then kept in the elevated position long enough for the...
Would people on the north pole see a totally different set of stars than people standing on the south pole..? Would the Big Dipper be visible from the South Pole..? Would people living on the equator see even a different set of stars..?
Homework Statement
Spring and Hanging Mass
A block of mass 4 kg hangs vertically from a spring with constant k = 100 N/m which is attached to the ceiling and initially is not stretched or compressed. The block is initially held at rest by an external force. The block is then released and falls...
Hello guys
I am wondering how to find a research position as an undergraduate. Typically, only third year student will be able to find something "real" research job in the summer. Does this mean that it's not possible to do research or maybe assisting research during the regular school time...
Homework Statement
A hot-air balloonist, rising vertically with a constant velocity of magnitude v = 5.00m/s , releases a sandbag at an instant when the balloon is a height v = 40.0m above the ground . After it is released, the sandbag is in free fall.
A: Compute the position and velocity of...
I need a list of type Ia supernova with redshifts, Distance Modulus, Distance modulus error, and position in galactic coordinates, but I havn't been able to find one that has all of that information (I have found several with some of the information, but not all of it). Does anyone know where I...
ok so here is the quesiton..
An object is loacted 3.5 cm from the optical centre of a lens. The lense produces an image of magnification that is +0.667 the size of the object
a) is this lens a diverging or converging lens? explain
b) Find the position of the image and the focal length...
Hi,
I'm trying to measure how far a rod that passes through a tube is offset from the center. Assume that the axis of the tube runs parallel to that of the rod. I can only access the interior of the tube from above (it hangs vertically), and the access hole I have is smaller than the radius...
Homework Statement
a regular hexagon OPQRST has its vertices at O ( the origin) and points P,Q,R, S,T with position vector p,q,r,s,t respectively. The point U with position vector u is the midpoint of the line segment OP, and SU meets OR at the point V
please see attached diagem
I need...
Velocity, displacement and position time graph help!
cyclist road east for 1.0x10^2 m with a constant velocity of 25 m/s she then accelerates down a hill and 5s later reached the bottom of the hill with a velocity of 50m/s
a) how long did the cyclist ride before reaching the hill?
B)what is...
I've been scratching my head over this one. I'm trying to find a system of equations to solve for points R and S. The known parameters are: Point Q, tangent vector t and the axis vector a.
The following vectors are perpendicular to each other:
a,d
a,b
b,c
c,t
d,t
The other known...
Lenses - magnification, position, focal length help!
ok so here is the quesiton..
An object is loacted 3.5 cm from the optical centre of a lens. The lense produces an image of magnification that is +0.667 the size of the object
a) is this lens a diverging or converging lens? explain
b)...
Homework Statement
A small positively charged sphere of mass m is attached to a very large positively charged vertical plate by a string and hangs due to gravity. The charge density on the plate, σ, is uniform.
a) Calculate the equilibrium position of the ball as a function of the (uniformly...
A v-t graph depicts an object's movement along the positive x-axis from 0-10 seconds. If the object at position x=xofc on the line at t= 6 seconds (depicted as point C on the graph), find its position at t= 10 seconds.
It appears the question is not referring to total displacement but just...
Before going off to college, I'd really like to do some physics-related research at a local university. I'm really excited about the idea of physics, and I can do math very proficiently. The problem is, I have no prior experience in research other than labs done in high school science classes...
Hi
I would like to know if I have a system of coupled harmonic oscillators whether the standard position operator for an uncoupled oscillator is valid, i.e.
x_i = \frac{1}{\sqrt{2}} (a_i+a_i^\dagger)?
where i labels the ions.
To give some context I am looking at a problem involving a...
Homework Statement
This circuit shows a 10Kohm potentiomiter with a 5Kohm load.
determine the position of the slider on the 'pot' when the voltage acreoss points 'xx' is 3V
ok so the 10K resistor is a potentiometer which is a variable resistor, so what they are asking when they say...
Homework Statement
You walk to the corner store after school to buy a carton of milk before going home. The store is 750 m south of the schoo, and your house is 625 m north of the school. What is your net displacement.
Homework Equations
dT=d1+d2
formula for displacement
The...
I am about to graduate with a bachelors in Mechanical Engineering with three possible paths:
- A confirmed offer as Design Engineering Trainee at a small design company which takes outsourced design projects related to industrial design and automotive
- A prospective offer from a...
Hi physicists,
How can two atomic-scale particles interact through gravitation (Gm1m2/r^2) or any other force that is a function of r if r isn't know with complete certainty. Is it that the force itself also comprises uncertainty in its value?
Thanks
Hi!
I was just wondering if anyone knows where I can find a software/algorithm that can give me the postion of the sun and the moon in ECEF coordinates?
If not, do you have any clues to how I might start building one? I am an engeneering student, so I don't have a lot of knowlegde about...
How do we experimentally determine the position of an electron that is not bound to any atom and far away from all other influences including electromagnetic and gravitational fields? [Edit: what would the apparatus be?]
according the principle of superposition, a wave with a certain amplitude superposed with a similar wave will yield a wave with 4 times the amount of energy.
This would be double the combined energy of the original 2 waves. Assuming 2 point wave sources are perfectly in phase; and there is no...
Bar collision with ground
Homework Statement
A uniform bar of mass m and length l has no angular velocity when the extremity A hits the ground without bouncing. If the angle α is 30º, what is the magnitude of v1, so that the bar rotates, around A, until it immobilizes on the vertical position...
Homework Statement
I'm not sure if my graph for this problem is correct... I've attached it below, can someone please help me? The problem is:
In heavy rush-hour traffic you drive in a straight line at 12 m/s for 1.5 minutes, then you have to stop for 3.5 minutes, and finally you drive at...
Homework Statement
Use the following Bronsted-Lowry reaction to answer the following question:
HMo(aq) + H2O(l) ⇔ H3O+(aq) + Mo–(aq)
The best description of this equilibrium is that:
A. Products are favoured.
B. Reactants are favoured.
C. The reaction is quantitative.
D. The reaction is non...
Homework Statement
Plot the position vs time graph of an object attached to a spring.
m = 0.5 kg
k = 60 N/m
x[0] = 3 m
v[0] = 4 m/s
Homework Equations
d²x/dt² + (k/m)*x = 0
The Attempt at a Solution
I solved the differential equation using DSolve and plotted the resulting...
If you have a cylindrical permanent magnet with a voice coil around it, sound moving the voice coil a small distance back and forth along the length of the bar magnet will produce an RMS voltage across the voice coil; but not very much RMS voltage if the voice coil is in the center of the...
Homework Statement
Assume speed of 435g football is known with 1mm/s uncertainty.
What is the minimum uncertainty in its position?
Homework Equations
I'm not quite sure... I know p=mv, and I know that Heisenberg's uncertainty principle states that certain parameters of quantum...
I am new to the topic of special relativity. Having read a bit of Feynman and googling for answers I am still a bit lost. While I have an aptitude for logic, it does not extend quickly into physics or maths. So quite likely I am barking up the wrong tree and about to demonstrate my ignorance but...
Homework Statement
A potential energy function is given by U(x) = 4x^2 and I found the total energy to be 7 J. They ask: Graph position vs. time and kinetic energy vs. time using this information and assume that the particle has an initial position of 0.
The Attempt at a Solution
I got the...
Hi everyone,
I am having trouble finding the answer to a homework problem. I don't seem to understand what the question is exactly asking for. The problem is:
find the path of a particle with an initial position 10er + 1.0eϴ and an initial velocity 0.1er + 0.8eϴ
Hi, I am making a program with the simulation software Breve. It codes in Python or in Steve (their own language). In my simulation, spherical particle with random radius are being spawned at random position into a little zone. My problem is that those particle cannot be superposed. I don't know...
I've been curious for some time about the concept of super position. my introduction to the idea was through the schrodingers cat paradox, which i assume most know, so i will stick with this example. is it not correct to assume super position is a concept to resolve the perceptual limitations of...
I'm trying to work out the mathematics of this for a school project.
Say you have 4 beacons arranged in a square (I think you only need 3, actually) at known positions relative to one another. Now say you are in a random position within this square, at a random height, and at a random...
Hey, I have been churning the idea of Dirac notation around in my head and I am thinking about the position and momentum basis representation of a wavefunction in a Hilbert space.
Wikipedia mentions the following in the article 'Bra-ket notation' under the heading 'Position-space wave...
Hello everyone. First of all, thank you for any help you can provide.
The essence of the problem is this. I am given the linear and angular velocity of an object at a given moment in time.
Data looks like this:
Time(s): Linear velocity (m/s) Angular velocity(rad/s)
10.313...
I'm looking at a book on meteor calculations involving at two Earth stations, A and B. The computations for A are given, and the same for B. I would like to know a reference for equations 12, 13, and 14. Even a derivation.
I find figure 4 a bit puzzling. The text uses lower case phi, a...
Homework Statement
A position vector of a particle at a time t is r=icost +jsint +kt ; show the speed and the magnitude of the acceleration is constant. Describe the motion.
Homework Equations
v = dr/dt
a = dv/dt
The Attempt at a Solution
Could someone let me know if I am doing...
Estimate the Fermi level position EFn for a Si sample at room temperature that
is doped with 1015 shallow donors cm-3.
From coursework I've gatherred over the year I understand the equation needed is: EF=EC-kT ln(NC/n)
n, being equal to the donor concentration
EC is the conduction...
Angular acceleration and Torque when rod reaches vertical position??
A rod (mass 1.30 kg, length .670 m) attached to a frictionless axis is released from rest in the horizontal position. What is the magnitude of the torque and angular acceleration when the rod has reached the vertical...
Homework Statement
An airplane has a constant acceleration while moving down the runway from rest.
What is the acceleration of the plane if it requires 800 ft. of runway before lifting o
at 100 ft./sec.?
Homework Equations
The Attempt at a Solution
I'm quite curious as to whether there is an equation (whether it be in scalar, vector, or tensor form) that defines the acceleration of a particle as a function of the three space coordinates and time.
My curiosity arose when I was thinking of the one dimensional equation:
a = v*(dv/dx)...
Homework Statement
find the position (r) when the vector comes to rest.
Homework Equations
initially velocity = 'u', acceleration = a
u= -14i-7j
a= 6i+3j
The Attempt at a Solution
hey guys I am new at this so i didnt know how to post it but some help would be great :)
i tried...