What is Body: Definition and 1000 Discussions

Body art is art made on, with, or consisting of, the human body. The most common forms of body art are tattoos and body piercings. Other types include scarification, branding, subdermal implants, scalpelling, shaping (for example tight-lacing of corsets), full body tattoo and body painting.
Body art is also a sub-category of performance art, in which artists use or abuse their own body to make their particular statements.
More extreme body art can involve mutilation or pushing the body to its physical limits.
In more recent times, the body has become a subject of much broader discussion and treatment than can be reduced to body art in its common understanding. Important strategies that question the human body are: implants, body in symbiosis with the new technologies, virtual bodies, among others.

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  1. A

    Mass of a body when Acceleration is 0 and Force is 0.

    We know that Force= Mass x Acceleration. When the force applied on a body is 0 the accelaration produced in the body is also 0. (F=m a). So, what will be the mass of a body on which no force is applied and no acceleration is produced? [ mentor note: post moved from New Member...
  2. L

    Looking for a critique: reactive black body radiation device

    I want to get a half convex lens (thick in the middle, flat on one side). And coat it in thermally and optically reactive transition filters. They are to be segmented so to reduce spread of filtering. This will give a view of the sky with any bright light inhibited at the focus. Next to the...
  3. L

    Sky temperature profiles and black body radiation

    I want to know, excluding the sun with an appropriate boundary, whether it is possible for the balance of bbr to be positive for outerspace rather than on earth? I am thinking of a half convex with an active polariser across-the outer surface which allows through most radiation below the...
  4. B

    Body centered cubic arrangement and others

    3-D Why in bcc central atoms does not touch other atoms in that layers while in that of hcp and all others cases central atoms touch atoms in that layer..
  5. marciokoko

    How to calculate the force needed to get out of bed?

    I know from physics 101 that f = ma. And if I want to lift an object straight up i have to multiply its mass times gravity (acceleration) and I get the force I need to require to overcome it. But what about lifting your body out of bed? Just the part where you physically get up from the lying...
  6. T

    What is the Sign Convention for Moments in Free Body Diagrams?

    Homework Statement In the picture, I am confused with the sign of the moments. When taking moments about D, the moment due to the 100N is taken as positive, but when they take moments about B, its negative. Homework EquationsThe Attempt at a Solution Shouldn't both cases be negative since in...
  7. GM Jackson

    How does a black body emit as much energy as it absorbs?

    Homework Statement A black body absorbs all incident electromagnetic radiation, including visible light which has wavelengths from 380nm to 750nm. IR radiation has wavelengths that are so long they are measured in microns. That suggests that visible light has a higher frequency than IR, and...
  8. N

    What's the average Body Composition by Volume?

    Hi. I'm trying to write some anatomical systems for a game I'm coding, and i need some good data to work from. Our game is about dogs, not humans, but i figure a human will be close enough What I'd really like is a case study of a specific organism, and i'd like to know the compositions, by...
  9. D

    MHB Free Body Diagram Explained: Why is Right FBD Upward?

    Can you explain why the free body diagram of each members are as shown? I kind of understand why the FBD of the member on the left is drawn as shown. But the FBD on the right is confusing, Why does it have a component in Y (upward) direction? thanks!
  10. V

    Question about speed of the flying body

    I tried to find an answer everywhere but didn't found it and I am not strong at physics so please help me I need to know equations for minimum speed required for some body to fly horizontally depending on it's mass , height of fligth and distance to fly . I mean object must travel some...
  11. D

    (Vector statics) Effect of a pulley on free body diagram?

    For example, a 1-m bar fixed to a wall holding a weight of 100 N, like this: How will the free body diagram of the second case different from the first?
  12. C

    Ground effect for blended wing body turboprop planes

    I wondered about possibility of using ground effect by blended wing body, turboprop planes. Purposes: -to save fuel (for example for flying tankers); -to return partially damaged plane; -to hide under radar and become visible for ships in the last moment; -to allow flight of overloaded plane...
  13. AakashPandita

    Finding height of revolving body at speed ##\sqrt{2gR}##

    Homework Statement There was a question in which an object was released upwards from Earth with a velocity of ## 2\sqrt {gR}##. Using conservation of energy I found that the speed of the body in the orbit was ## \sqrt {2gR} ## Everything's fine till now. But then I wanted to find the height at...
  14. K

    Free body diagrams and Newton's Law

    Homework Statement 2 masses, m1 and m2 are connected by a cord and placed on a frictionless table as shown in the diagram below. m1 slides on the frictionless table while m2 is hanging from a light frictionless pulley. What would be the mass of the hanging mass m2 if we know that the tension in...
  15. J

    Black body re-emission of incident radiation

    I know that a black body is an idealized body that absorbs all the incident EM radiation. And I also know that the BB emits a spectrum of thermal radiation that depends on its temperature. What I cannot understand is the re-emission. For what I've read, when in thermal equilibrium, a BB absorbs...
  16. bagofbones

    Moment of Inertia: Is it an Unambiguous Body Inertness Characteristic?

    I have a question about body inertness. Is moment of inertia is unambiguous inertness characteristic?
  17. Naeem Anwar

    Relative Angular Momentum in 2 Body Decay at Detector Level

    How the relative angular momentum of two particles can be detect by detector in two particle decay (center of mass frame)? I am curious about the signatures/differentiation between different relative momenta, means how one can decide that it is L=0, L=1,2,3,...? Of course the distribution would...
  18. L

    Relative Body Angles of a Human Moving Through Space

    Homework Statement Say a human is moving through space with constant acceleration due to gravity. There are no external forces/torques on the body other than the force of gravity. The person applies an internal torque at some joint, let's say the knees, so that they bend. Assume the rest of the...
  19. L

    Inertia of a Body: Explaining the Impact on Falling Passengers

    I would appreciate someone's advice on the following question: "An airplane was moving in the forward direction on the runway when it suddenly stopped. When the airplane stopped, some passengers who did not put on their seat belts fell forward from their seats. Would a passenger of larger...
  20. C

    Free Body Diagram of a ice skater?

    Homework Statement In our science class, we had to draw a free body diagram of an ice skater. The ice skater pushes against a force plate and that results in her skating in the other direction. (Newton's third law of motion). We have to use Newton's three law of motions to explain this...
  21. K

    Transformation from Body-frame to ECEF-frame

    Homework Statement I have a body which is instantiated on Earth at some latitude, longitude and altitude. The body has acceleration which is expressed in body coordinates and the acceleration can be integrated to obtain the velocity vector which is also expressed in body coordinates. ECI and...
  22. Safinaz

    What is the Correct Factor in the Kinematics of Two Body Decay?

    Hi there, In a two body decay process like ## B \to l \nu ##, there is a factor ##| \bar{l} (1-\gamma_5)\nu|^2 ## in the matrix element amplitude, in which equals ##| \bar{l} (1-\gamma_5)\nu|^2 = (/\!\!\! p_l+m_l) (1-\gamma_5) /\!\!\! p_\nu(1+\gamma_5) = 2(/\!\!\! p_l+m_l) /\!\!\...
  23. wolram

    Body Transplant: Can We Have One? - RT News

    http://rt.com/news/248473-transplant-head-body-canavero/ what do you think about this, if it is true can i have one mines knakered
  24. ognik

    Angular momentum of rigid body elements tensor

    Homework Statement I was working through my text on deriving the tensor for Angular momentum of the sums of elements of a rigid body, I follow it all except for one step. Here is a great page which shows the derivation nicely - http://www.kwon3d.com/theory/moi/iten.html I follow clearly to the...
  25. N

    Rigid body physics simulation math issue

    Hey all, I'm making a physics simulation for training an algorithm of mine, I'm running into issues on the rigid body physics simulation. Let's say I have a leg composed of a calf and a thigh. gravity will be acting on both, and the calf is attached to the thigh, Any suggestions on how I would...
  26. P

    Calculating Kinetic Energy of a Rotating Grinding Wheel

    1. A grinding wheel of mass 5 kg and diameter 0.20 m is rotating with an angular speed of 100 rad/s. Calculate its kinetic energy. Through what distance would it have to be dropped in free fall to acquire this kinetic energy? m = 5 kg, r = 0.20/2 m = 0.10 m, g = 10 m/s2, ω = 100 rad/s 2. v =...
  27. Feodalherren

    Rigid body dynamics: falling stick

    Homework Statement A stick of length L and mass m is falling on a table with kinetic friction uK and static friction uS. Find the equation that determines whether the rod will stick or slip. If m = 10kg and L = 100cm, uS = 0.8, uK = 0.7 and initial theta = 30 degrees find the initial accel for...
  28. S

    Heat transfer from body through layers, using h, T, d, A

    Homework Statement Consider a person in a room with an air temperature of 21C. The persons core body temperature is 37C and their surface tissue thickness is 5 mm. If the total surface area of their skin is 1.5 m2, and they are wearing clothes of a thickness of 2 mm and the surface heat...
  29. AndrewC

    Closest stable orbit of a body around earth

    Homework Statement This is a problem I picked for my calculus one class that I would like to solve, then model the solution using the sandbox video game universe sandbox. I would like to calculate the closest stable orbit of the moon, if possible allowing for some eccentricity in the orbit...
  30. T

    Help with free body diagram for a pendulum

    Homework Statement I want to sum the forces perpendicular to the pendulum and sum the moments about the pendulums center of gravity. Homework EquationsThe Attempt at a Solution P\sin \theta - mg\cos \theta - N\cos \theta = -m\ddot x\cos \theta + ml\ddot \theta -Pl\sin \theta - Nl\cos \theta +...
  31. E

    D'alembert force and what the body "really" feels

    hello everybody, I have a question regarding the fictitious force (d'alembert force) we usually add to an examined body in a noninertial reference system. As I understood from reading and leraning about this topic, this force is artificially added only to compensate for exploring this body in...
  32. hdp12

    Internal Force Diagram for Rigid Body and Distributed Load

    I'm working on a homework problem for Statics and I'm stuck. Could someone please help?Problem: Draw the internal force (N,V,M) diagrams and include all significant figures Here is all of my work: Resulting F from W1: W(x) = W1 ∴ F2=∫02b W1dx eq (1) ⇒ F2 = W1⋅2b x1 = (F1)-1 ∫02b W1dx =...
  33. manogyana25

    Can energy transferred from one body to the other be of same form?

    Suppose some energy, say light energy transfers from one body to another .. Then will the light energy transferred to the second body also be in the form of light energy? I mean are there any chances that the energy transferred between two different bodies be of same kind of energy? If yes...
  34. resurgance2001

    Why does the Sun behave like a black body?

    My question is, given that the Sun is composed almost entirely of just hydrogen and helium, why is the spectrum from it continuous and not an emission line spectrum? This applies to other stars as well. There are other elements of course present in the Sun, but they are present in very small...
  35. barryj

    Falling body where acceleration is not constant

    Homework Statement Most physics problems that involve a falling body assume constant acceleration. How does one account for the changing acceleration if a body is dropped from a very high altitude? Homework Equations With constant acceleration, d = (1/2)at^2 or t = sqrt(2d/a) but a is not...
  36. B

    Euler Angle from Body Frame to Inertial Frame

    Hi, This is not really a homework problem, but a project I'm working on. So, I am trying to build a Simulink model for my quadcopter. I derived the equations of motion using the Newtown-Euler method in the body frame to get transnational and angular acceleration. For the transnational part, I...
  37. T

    Angle to lift a body off the surface

    Homework Statement A rectangular box is being pulled by a rope with a force T on a horizontal surface, with a friction coefficient μ. What is the minimum angle α at which it will lift of the surface? See attached image. Homework Equations \begin{equation*} \tau = rF\sin\alpha \end{equation*}...
  38. stipan_relix

    A homework assignment including rotation of a rigid body

    Homework Statement The problem is this: A car is evenly slowing down from 30 km/h to 0 in the time of 2 seconds. Radius of its wheels is 30 cm. What is its angular acceleration and what total angle will the wheel describe until it stops? How many turns does the wheel make and what is the length...
  39. K

    Free body diagram of a beam construction

    Homework Statement Beams AC and BD are light (no mass) and they're conjoined at B. Points A and D are fixed but frictionless. The radius of the wheel is R and the weight hanging on the pulley has the mass m. Homework Equations Fx=0 Fy=0 M=0 The Attempt at a Solution I'm stuck at the very...
  40. G

    Rotational Period of Large Body

    Homework Statement The Sun rotates on its axis every 25 days. The sun currently has a radius of 7X10^8 m. When it expands into a Red Giant (in about 4 billion years) it will have a radius of 1.5X10^11 m. What will its rotational period be assuming the same mass for both, and they are both...
  41. nate crosby

    Free Body Diagram -- forces on a structure over a balcony wall

    Hi, I am trying to work out the forces involved at the contact points in a design of a structure over a balcony wall. I have drawn up the cross section of the situation equilibrium, with a tolerance. I want to find out what forces will be acting on the structure and the balcony wall when a...
  42. A

    Direction of instantaneous axis in rigid body dynamics

    The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass. These axes need not be stationary. Consider, for example, a thin uniform disc welded...
  43. A

    Black Body Radiation: Will it Behave as Perfect Black Body?

    Will a body of given emissivity kept inside a perfect black body start behaving as a perfect black body?
  44. P

    Would a silver suite be a better body temperature decreaser

    Would a silver suite be a better body temperature decreaser than a mister of water? I cool myself off by spraying myself with water but I hear silver is the best conductor, is it better at conducting heat off my body than mist?
  45. S

    What causes drag on a stationary car?

    See attached photographs. For the car problem, I think the drag should be smaller than the forward acceleration but I'm not sure. For the Rocket question, I am pretty sure I am correct but I'm not sure why. The drag and the weight would both be in the down position.
  46. F

    Force of a full body jerk (myoclonic jerk)

    Hi there, I would like to know how much force a full body jerk creates. You've probably all experienced this, when you were just about to sleep in, when suddenly your whole body jerks. I know that it is probably very difficult to measure the force excactly. But what might be the probable range?
  47. L

    What Angle Is Needed to Simulate 0.8g Deceleration on an Inclined Plane?

    I am a truck driver, the law requires me to restrain my load of 100kg, to resist a forward braking force (deceleration) of 0.8g. If, I took the 100kg load and tilted it (inclined plane), what angle of tilt, would be required to represent a force of 0.8g ? How does one calculate the angle...
  48. G

    Free Body Diragram of a pulley

    Homework Statement In the figure (Figure 1) each of the suspended blocks has weight w. The pulleys are frictionless and the ropes have negligible weight. Homework Equations w = mg Forces cancel out, so Tension = weight (since they are suspended) The Attempt at a Solution For a (pulley) )...
  49. D

    Will a body ever escape in a 3 body problem?

    I am asking this question because I found it in a lecture by Stephen Wolfram which you can see at this link at about 54:10: Apparently the question cannot be answered with current methods of physics- Wolfram describes it as "undecidable". But what is the question? When he says "escape" does...
  50. J

    Girl Hit Wall with 110 lbs Force After "Falling" Sideways

    I am a writer, and this is the opening scene in a story I'm currently working on. A girl weighing 110 lbs gets sucked across a room, about 50 yards, then hits the wall. Her boyfriend knows that if he doesn't get her into a stasis pod within 10 minutes, she'll be dead from the massive internal...
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