bodies Definition and 501 Threads

further to earlier question on whether soul exists...I have been plagued by poltergeist like happenings since I was a kid. Either some dead person wishes to talk to me soooo badly that I'm being stalked by a ghostie...l.o.l...or my mind gets miffed and moves things around so that I notice it...

Bodies The Exhibition, has anyone ever visited that exhibition? It's coming to Amsterdam in a few weeks time http://www.bodiesamsterdam.nl/ and I'm pretty excited to be able to see the anatomy of real bodies, though it must be a really strange experience with the fact that you are looking at an...

My problem is to find the force needed to give the system of bodies a velocity of 30 ft/s after moving 20 ft. from rest. Can anyone help me with this? All i have done is found EFx and EFy for the 50lb. force.

I am doing an extra problem from my textbook as review and I am stumped. An Earth based observer sees to spaceships approaching Earth in the same direction. Spaceship A is traveling at 0.500c and Spaceship B is traveling at 0.800c. How fast is spaceship A traveleing as viewed by an observer...

Hello , I've come across a phrase that i don't understand while doing an exercise in this chapter . What's the meaning of a 'uniform paper collar' Please explain to me =) Cheers mate

I'm new to this, so I'm not exactly how to go about looking for this. It can usually lead me to articles that are over my head. I'd just like to know where to go about to understand how the following systems work. Immediate Energy (ATP-CP System) - Phosphagen System Short-Term Energy...

Hey everyone. I am working on a planetary simulation model and am having a bit of trouble with the math. Given the volume and density of a particular planetary body, how do I calculate the mass? Once I have the mass, how do I calculate the orbital distance of a satellite body to said panetary...

Well, this is my first post--hopefully I'm posting in the correct forum... I'm developing a space simulator computer application in which a rigid body's motion is calculated using its linear momentum and rotational momentum. I'm simulating multiple bodies attached together (for example, a...

Hi all! I am having trouble understanding how to create a simulation of a spinning rigid body. For each axis x, y, and z I have an angle and an angular velocity. To rotate the object each axis is rotated independently - first the rotation about the x-axis followed by the rotation about...

consider a yo-yo consisting of two cylinders of radius R1, (combined) mass M1, glued to another smaller cylinder of radius R2, mass M2. find the final velocity after falling a height h using Newton's second law. assume the string is vertical. the inner radius R2 is R0, the outer radius R1 is...

Well here's what I've done. I think I've missed the mark big time with this one... MI = 2/3 Ma^2 = 2/3 m(2a)^2 = 14/3 ma^2 Initial Energy = 0 + mgh KE + PE Energy Just Before Impact = ((1/2 Iw^2)/-KE) + 0/PE By Energy Conservation 1/2 Iw^2 =...

can anyone pls explain to me what is sliding and rolling of a let say a wheel??I'm really confuse about it thanx

The motor of a table saw is rotating at 3450 rev/min. A pulley attached to the motor shaft drives a second pulley of half the diameter by means of a V-belt. A circular saw blade of diameter 0.208 m is mounted on the same rotating shaft as the second pulley. PART A: The operator is careless and...

Question: "An airplane engine delivers 1.5x10^6 W at an angular velocity of 2400 rev/min." A) Compute torque developed B) If a drum of negligible mass, .5m in diameter, were attached to the motor shaft, and the power output of the engine were used to raise a weight hanging from a rope...

Question: "A block of mass m1 = 1.87 kg and a block of mass m2 = 5.84 kg are connected by a massless string over a pulley in the shape of a solid disk having radius R = 0.180m and mass M = 12.7 kg. These blocks are allowed to move on a fixed block-wedge of angle 31.4 degrees as in the figure...

Hi all..new to the forums.. I've got this homework that's been annoying the hell out of me..spent ages trying to do it, but I can't get it. The problem is attached. Any help is much appreciated, cheers.

I really really hope that this is not true. I saw the video on the ABC evening news and it looked very real. Stephen Dupont an embedded Austrailian journalist shot the film. This is definitely no way to win friends and influence people.:mad...

If someone could please help me with the following question I would greatly appreciate it. An object falls a distance h from rest. If it travels 0.5h in the last 1.00s, find the time and the height of its fall. Ok, so for the second half that the object is falling, the velocity is 0.5h...

Ok guys, here is a question I have about freely falling bodies. I did do the questions but my answer just doesn't seem right to me, I don't think I went about it the right way. I will show what I did below the question: Determined to test the law of gravity for himself, a student walks off a...

Hey all - I have tried and tried to work this problem but I guess I am missing something (I can submit my answer several times to see if I am right and I have been wrong every time) - Here is the problem - A pellet gun is fired straight downward from the edge of a cliff that is 13 m...

Does anyone know the name of the law that says that if 2 bodies of different sizes are orbiting each other, the smaller one will break up if its a certain size to the other one?

Is string theory the (more-or-less) only way of dealing with 'extended bodies' in a theory like QFT? Or does it only deal with very specific actions, or ones representing 'particles' with special dimensionalities (e.g 1+1 only)? If it is general, is all the commonly-stated phenomenology (11...

Hello everyone, Its good to FINALLY be back! :biggrin: I was wondering why the path of the planets in our solar system is elliptical and not circular? ~Kitty

yea...i'm having trouble today with my HW lol a sign weighing 400 N is suspended at the end of a uniform rod 4.00 m weighing 500 N. what is the tension in the support cable if it makes an angle 40 with the rod? now I'm curious i don't think Tclockwise = Tcounterclockwise comes into play...

I heard that each our bodies have on average a billion of shakespears body's atoms in them (A short history of nearly everything, Bill Bryson). Is there any truth in this, does that mean we have on average a billion of every persons atoms that has ever lived?

Is it possible to build a logical argument on the following line? 1) The force of gravity can only be observed between two or more bodies. 2) The claim that a single body has a gravitational field is purely theoretical; it cannot be observed. 3) If the only demonstrable gravity force is a...

Is there a commonly used single term that describes a star and all of its associated bodies including its planets, asteroids, comets, Kuiper Belt and Oort Cloud? If not, what is the most acceptable and shortest way of describing this structure?

Well, I've heard about some people who can let electricity flows through their bodies without any serious damage. Is there any sciebtific reason or theory for this? Is that the resistance f them 0 or nearly so? What do you think?

in male pronuclei and sperm pronuclei, they differ in formation because the male has an Y chromsome where female has both XX right? are there any other differences? and how do the first and second polar bodies differ in terms of their chrosome content?

Hi ! I'm trying to figure out what kind of initial conditions I should put in my program in order to have stable trajectories. Just to remind, The restricted problem of three bodies suppose that you've got two heavy masses in circular orbit around their common center of mass, and a...

Galileo’s law of falling bodies ?? hi everybody, I want to know about the mathematics of deriving this laws. or in another word I want to know how did he find it.. Ali

Can we find... Is it possible for us to find the universe point of origin based on location of cellestrella bodies? If so how? If not why?

I know this may be seen as a physics question and it is, but i am just looking for an explicit solution to falling bodies with air resistance. OK many of you are probably familiar with the equation for a body falling with air resistance. mdv/dt=mg-kv^2 I am not sure exactly how to...

I used atwoods machine to test the affect of mass on the speed of falling bodies. My research said objects fall at the same rate no matter their weight. When I tested this on Atwoods machine heavier masses fell faster. Can someone tell me why?

After seeing images from recent Tsunami in Asia and hundreds/thousands of human corpses lying all over the place, i just wonder how bad is stench of rotting dead bodies lying in warm climate like in Indonesia? Is it kind of like regular road kill or dead cow, or maybe the smell is...

Alright, I'm stuck on this problem. Two metal disks, Radius 1 = 2.5cm, Mass 1 = 0.8kg and Radius 2 = 5.0cm, Mass 2 = 1.6kg are wielded together and mounted on a frictionless axis through their common center. The first part asked what is the total moment of inertia of the two discs, which I...

hi our genetics teacher has asked us about possible functions of polar bodies (if they are unfunctional, why do not they fully disappear but limit their smallness in some way; etc) and I could only find some diagnostic usages of polar bodies and that their nuclei could be inserted into...

If there are two rigid bodies rotating, (known I) how can you compare their rotation? Example: If the object of moment of inertia I is spining at x rad/sec, and its I is changed to i, what is the new speed?

The following comes from Landau's Mechanics, pages 97 - 98. For a particle in a rigid body, v = V + W x r -- (1) where for some origin O of the moving body measured in the "fixed" system of co-ordinates, v = particle's velocity in body in the "fixed" system, V = velocity of O in "fixed"...

It is my understanding, that space time is expanding, and that gravitationally bound bodies will stay unaffected by this expansion while unbound bodies will. but is gravity the only force that can overcome this effect? could magnetic or electro static forces hold bodies in station? I do...

I'm having difficulty with the question, perhaps mainly because it is consists completely of unknowns, with little or no numbers. Help, in the form of steps to reach the proof would be much appreciated: 'A uniform ladder of mass M rests in limiting equilibrium with one end on a rough...

can anyone help me with this please...? :eek: How much pressure is needed to compress the volume of a steel block by 0.14 percent?

i'm working without my textbook and going by the some solutions that i have so i need some help 1) Two masses, m1 and m2, joined with a cord are dragged along the horizontal plane surface. the applied force is F=20N, mass m1=m2=3kg, and the acceleration is 0.50 m/s. what is the tension, T, in...

What do the polar bodies formed in oogenesis do?

im supposed to show why angular momentum is conserved in a rotating body with no external torques or forces acting on it. i know to use the I_1*w_1=I_2*w_2 where I is the moment of inertia of the object in motion and w is the angular speed. My qu estiosn are: which equation for Inertia...

Newton says: “A body accelerates proportionally with the force it carries and reciprocally to its mass”. His equation is: \frac {F}{m} = \frac {d^2x}{dt^2} So, what Newton does is consider the position changing while time goes by and while the force and mass remain constant. Conclusively, if...

This was a question on one of our past exams, and our professor said it was really simple. Of course, he also said that only one person got it of the 400-some people who took the course, possibly because the scenario was very unusual. Here's what I've done so far: \overline{I} = 1.686 kg...

Can somebody help me with this problem, it is probably pretty easy but I can not seem to think of how to solve it. A object initially located at point A on the rim of a grinding wheel rotating about a horizontal axis. The object is dislodged from point A when the diameter through A is...

At the centre of the sun, gravity is in equilibrium, as with in the centre of the earth. As you go towards the centre of the Earth you will get lightr and lighter as the force of gravity pulling you upwards above you gets larger and larger slowly decreasing the net force of gravity inflicted...

I got up this morning, and decided I was going to try to calculate this. So here is what I asked. Given 2 stationary bodies, starting some distance apart, of different mass, where would they collide in respect to one another? I tried using Newton's gravity formula to calculate the force of...