Human Definition and 895 Threads

For any given human muscle (the bicep for example), are there any other factors that determine the amount of force it can exert besides the amount of muscle and the "type" (red vs white, or slow-twitch vs fast-twitch)? Say, if you had a person who had .5 kg of muscle in his bicept that was 60%...

Hello, I've been taught in high school that the most sensitive part of the human body was the index finger. However recently I've read that it is the clitoris... But I've a doubt if it is true. I'd like to know the sensitivity of the human eye. I don't have any anatomy book nor medical...

The power per unit area radiated by an ideal blackbody radiator is P/A = σT4, where P = power, A = surface area, the Stefan-Boltzmann constant is σ = 5.67 ×10−8 W m−2 K−4, and T = temperature (in the absolute kelvin scale). How much power is radiated by the human body? Calculate the total...

Recently? What are some that you would like to share?

Does anyone know what is the maximum pressure in which a human body can function? And how does air pressure affect the minimum breathing frequency? I suppose increased pressure would allow a person to hold breath longer. For example: a scuba diver or a person in a diving bell 50m bellow...

http://news.bbc.co.uk/2/hi/uk_news/6057734.stm It's interesting but sounds BS to me. What you think about humans in that many years(~10,000) from now?

well is it greed? emotion? freewill (If you believe in freewill)? unpredictability? what distinguishes us from animal or machines who share some of the properties above?

Hi I was wondering, if there were any human glycosylases, other than these, I got this list from DNA repair and mutagenesis, Friedberg EC, Walker GC, Siede W, Wood RD, Schultz RA, Ellenberger T (2006) ASM Press, Washington, DC. UNG SMUG1 MBD4 TDG OGG1 MYH NTHL1 MPG NEIL1 NEIL2...

Hello. Let me start by asking your forgiveness for my lack of grammatical skill. I know I need work in this subject. None-the-less, I'd like to ask a couple question concerning my dream. Please keep in mind that college is quite a ways off. I'd like to be prepared now though. Along with my...

Homework Statement A human eyeball has roughly a diameter of 15mm. The diameter of the pupil can be up to roughly 5mm. Do you think that the fact that the light receptors on the retina are spaced by at least 2 micrometers is just a coincidence? Justify your answer. The Attempt at a Solution...

Extinguishing the Human Species Evidently human females are born with all of their eggs already in their body. I have often speculated that some form of radiation might some day make every human female egg sterile. “HOW MANY EGGS DOES A WOMAN ACTUALLY HAVE? A human female typically has...

I want to know how our genes limits and define our growth, I mean, how the osteoblastos knows that they must stop or continue, how our cells knows when to stop growing or dividing, etc. Every human has a unique "morphology", the bones and skull has their own and particulary morphology, but...

When i learned Newtonian mechanics i had this question is that we know a object have certain inertial.. but why does it acts this way? what actually is inertial? we know f=ma but why it works that way? we know so much about quantum mechanics but why is it true? In today's world it seems...

Hello, Would it be possible to clone a whole new human body and then transfer your existing brain to the clones body. Would that be like having a fresh new body? Would you be able to live forever if you repeated the process? I'm sure that there would be many complications. However if they...

I understand that topo-physiologically, the human body is a donut. i.e. not only are we a donut physically, but we are a donut as an organism. Our skin is an interface between the outside world and the inside of our bodies. Bacteria and other microbes have to get through our skin defense...

Homework Statement A 50lg man jumps off a bridge 80m high. He lands in choppy salt water feet first. Each foot has an area of 75cm^2. The goal is to find out a) What is the force sustained by the human body while hitting then decelerating in the water. b) depth of penitration Because...

France accused in Rwanda genocide This story is really part of a bigger one, where magistrate Jean-Louis Bruguière accused Paul Kagamé (current president) and his entourage of involvement in the death of the former president, Juvenal Habyarimana, a Hutu. Maybe the ICC can help ? :devil:

Does a persons attitude, or way of life affect their internal body? I don't mean it as a couch potato will be weak. I mean it as a picky person will they have allergies? Will a germ phobic have ...

Has there ever been an estimate for total human caused heat output? If all humans and human activity were removed from Earth would the temperature fall?

A week or so ago, my high school physics teacher sent us all summer work - we have to write an article explaining the processes by which electromagnetic fields (particularly low frequency electromagnetic fields) could effect the human body. Since then, I have been wading through the large wealth...

This was accidentally posted in the general forum so I moved it over to a more appropriate section of the forum... Hey guys: Just needed to know if this logic/math is accurate. I haven't taken a science class since my undergrad days and it was ages ago so I am not too confident with all the...

http://www.measureofamerica.org/ & WOW is there some appalling stuff about the so-called "world's only superpower," if anyone cares. Here are some tidbits that stood out for the British media...

Please correct me if i am wrong. As per MWI,when an observer open the box,schrodinger cat will be alive in one world and the same cat will be dead in other world. If we replace the cat with human,then the dead human and alive human will be different worlds.so,my curious question is does this...

Human tissue contains about 3*10^27 electrons per kg of material. Suppose two humans are located 1370 km apart and each has a mass of 60 kg. We now transfer 5*10^21 electrons from one person to the other. What will be the magnitude of the resulting attraction, rounded to the nearest Newton? I...

Homework Statement Under favorable circumstances the human eye can detect 1.0e-18 J of electromagnetic energy. How many 600-nm photons does this represent? (Modern Physics, Arthur Beiser, 6th Edition, Pg. 89) Homework Equations My answer is unreasonably low. My mistake is probably very...

Is human flight possible? I'm not talking about flapping your wings. I'm talking about flying like Superman. I think it's possible. Does anyone have an explanation? I fly all the time in my dreams and I feel like I could fly in real life. Please be serious about this post because I am.

Hello everyone :) There is an alien that just came to Earth and is having trouble recognizing peoples faces. We also have trouble recognizing his face; where his eye is on one hand and a mouth on the other. Luckily for us the alien understands our language and simple colours. The task is...

Since the human mind has a relatively large degree of freedom, it can do things on its own will. How does the human mind fall under the laws of entropy?

Unfortunately, magnetic fields are by their nature invisible, but scientists from NASA’s Space Sciences Laboratory have managed to put on film what these natural phenomenons would look like if we could see them with our own eyes. Please note that this is a simulation and has been created using...

[SOLVED] center of mass in which direction would the center of mass of the body migrate if the arms were raised overhead? what about if the person had a bilateral amputation of his legs?

http://scienceblogs.com/erv/2008/05/hahahahahahahaha_you_guys_omg.php There is an MP3 on that entry, obviously, and you should NOT listen to it, but you will. Very long intro, over a minute and a half long, so you can skip that. Also, some commercials.

From my limited knowledge of the physics of the human Eye.. I got the impression that the image enters the brain via optic nerve which I always assumed to be an electrical impulse circuit. But if this were indeed the case, vision interpretation would be purely a psych/brain function. The...

The human ear canal is about 2.8 cm long, if it is regarded as a tube that is open at one end and closed at the eardrum, what is the fundamental freq. around which we would expect hearing to be most sensitive? Take the speed of sound to be 340 m/s. Is it: wave speed = frequency x wave...

http://www.sciam.com/media/inline/A070BA0E-9DA1-A982-E2844D04DDC05DC6_1.jpg http://www.sciam.com/article.cfm?id=real-life-iron-man-exoskeleton

Hi, Can H. sapiens and P. troglodytes produce (infertile) offspring? Has there ever been any experiments where this has been attempted? Which position is more theoretically sound?

Are we no more than animals, I know we separate our selves from the animals because we can manipulate our environment, shape and mold things out of steal. I think we are a truly violent race; if you would put 30 people in a room with no way out, the people would divide themselves and invertible...

I don't want to ask this question in a New Age metaphysical type of way so please don't interpret it as such. What frequency does the human body run at? Does this question make sense or is it too broad? I will try to fire off a frew separate examples of what I mean so that the question...

as a human canon fly zaccini flied a distance of 53 meter in 1940 ( still record ) his velocity as he leave the cannon is 24,5 m/s in a angle a with thw horizontalplane a) what is the angle ? ( 31,2 ) b) find the highest point during the record ( 8,04m) can you set up theese tasks ?

Hi, Can someone provide a list of anucleate cells in human body? i know platelets and red blood cells are anucleate. Are there more? Thanks a million.

I know this hormone can be dangerous and that using it isn't going to extend your life or anything...but can it affect height? Theoretically is there a way it could be used to grow a few inches, if so how much and in what way? (In someone in their 20s as opposed to someone in their teens) If not...

Human spaceflight is an essential part of both the US and Russian space programs. Many of you at this site apparently lament this. I have encountered numerous arguments along the lines of "If only all that money NASA wastes on human spaceflight could be directed to science." Redirecting that...

I heard the virus' natural host is a flea commonly found on cave-dwelling bats, especially the vampire bat. Is this an actual virus, is there any info about it?

Hello, I need some help figuring out how to proceed. Homework Statement Make up a ruler, that can measure human reaction time in time intervals of 0.05s. There supposed to be 6 intervals in total. We did a similar experiment in class, where a student drops a ruler and I need to catch it as...

Homework Statement (1) the torso, neck, and head (total mass = 42.3 kg) with a center of mass located on the y-axis at a point 0.423 m above the origin, (2) the upper legs (mass = 19.8 kg) with a center of mass located on the x-axis at a point 0.190 m to the right of the origin, and (3) the...

I recently saw the movie 'Sunshine' where they send a mission to detonate a bomb and save the Sun from dying. In one of the scenes, two astronauts had to cover a distance in the outer space but they didn't have space suits available. They wrapped themselves in some kind of foil and the whole...

Is it possible to have a negative sound intensity level? A sound that is below the threshold of human hearing has... (A) a negative intensity level (in dB). (B) a negative intensity (in W/m^2 ). (C) an intensity level of zero. (D)an intensity level less than 1 dB , but greater than 0...

http://news.bbc.co.uk/2/hi/business/5013830.stm

Im curious if anyone knows if it is theoretically possible to place the human mind into an infinite loop in a similar manner to the placing an electronic computer into one. If not, why? What is principle physical/neurological process that prevents this from occurring?

In the same way every time we look at the stars we see the past of the universe. Can we see our history placing a extremely powerful telescope pointing towards the Earth an arbitrary number of light years away? I know that would require faster than light travel, but maybe we could shortcut...

I was reading and attempting to understand Max Tegmark's research on the multiverse, and I found this: http://science.howstuffworks.com/quantum-suicide.htm Now, while How Stuff Works is generally a good site, there are some areas that they could have been clearer on. The paragraph...