A hand is a prehensile, multi-fingered appendage located at the end of the forearm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs. A few other vertebrates such as the koala (which has two opposable thumbs on each "hand" and fingerprints extremely similar to human fingerprints) are often described as having "hands" instead of paws on their front limbs. The raccoon is usually described as having "hands" though opposable thumbs are lacking.Some evolutionary anatomists use the term hand to refer to the appendage of digits on the forelimb more generally—for example, in the context of whether the three digits of the bird hand involved the same homologous loss of two digits as in the dinosaur hand.The human hand usually has five digits: four fingers plus one thumb; these are often referred to collectively as five fingers, however, whereby the thumb is included as one of the fingers. It has 27 bones, not including the sesamoid bone, the number of which varies among people, 14 of which are the phalanges (proximal, intermediate and distal) of the fingers and thumb. The metacarpal bones connect the fingers and the carpal bones of the wrist. Each human hand has five metacarpals and eight carpal bones.
Fingers contain some of the densest areas of nerve endings in the body, and are the richest source of tactile feedback. They also have the greatest positioning capability of the body; thus, the sense of touch is intimately associated with hands. Like other paired organs (eyes, feet, legs) each hand is dominantly controlled by the opposing brain hemisphere, so that handedness—the preferred hand choice for single-handed activities such as writing with a pencil, reflects individual brain functioning.
Among humans, the hands play an important function in body language and sign language. Likewise, the ten digits of two hands and the twelve phalanges of four fingers (touchable by the thumb) have given rise to number systems and calculation techniques.
Don't get me wrong, I'm all about research. I've been doing physics research for two years (not much, in the grand scheme of things), but I love it. I love programming which is mind-numbingly boring to most people, I love solving equations, I love being able to understand the universe around us...
Homework Statement
If z is east and y is north then x is?
A. West
B. East
C. North
D. South
E. Down
Homework Equations
I have trued getting the proper orientation but the direction I would have obtained is not an option 'up' a comment would be appreciated
The Attempt at a Solution
Homework Statement
If z is up and x is west they y is what direction
A. West
B. Down
C. Up
D. East
E. South
Homework Equations
The Attempt at a Solution
I tried applying the rule and obtained south as my answer would anyone be able.to provide a.solution
Homework Statement
A particle with a unit charge enters a magnetic field B = i + j with velocity v = 17k . Find the magnitude and direction of the force on the particle.
The Attempt at a Solution
Had no issues finding the magnitude. However, when finding the direction of the force...
This is not a homework problem, but pertains to the class (Calculus II) that I am taking.
I am very confused about how to think intuitively about determining orientation of a cross product.
My understanding of the right hand rule in determining the orientation of the third axis is that...
Would you buy a second hand textbook if you couldn't afford a brand new one? On amazon for example there are $100 books selling for $5 second hand or multihand but I just have a feeling they will have scribbles and crap all over them.
What is your general experience from buying multihand books?
Ha! First post! Hope you guys can help me. It's not really a homework problem, but it's close enough.
Homework Statement
What is the probability of drawing a king, a red card, and a jack from a fair deck of 52 cards, in that order, without replacement?
The Attempt at a Solution...
I'm trying to write some code to do a regression on data weight (x) and time (y). As best as I can tell, the model should be y = b1 + b2ln(x), but I don't know how you can do this by hand (I know how to in R...). I also know how to do a simple linear regression by hand.
Can it be done using...
Hi guys I always get confused when I do the right hand rule like here when I apply it to this problem I am getting different answer than what the book have.
A uniform magnetic field B, with magnitude 1.2 mT, points vertically upward throughout the volume of the room in which you are sitting...
I have trouble understanding how to draw phase portraits. Is there a good pedagogical overview of their basics (such as elliptical vs hyperbolic orbits, separatrices etc.), along with an algorithmic way of how to draw them when it is not easy/possible to find v(x)? Basically something explaining...
I wanted to know if there is any Kits out there or how I can make a Hand Held Genarator?
I am a P.C. Repair Tech and I know a little bit about Elecric.
And I thought it would be a nice little project.
I know if you take a Motor and attach a Handle to the Shaft and turn it you are turning...
Hello everyone,
I have two different problems from webassign homework that I could use some clarification with; as stated in the title, I'm having trouble applying the right hand rule in both. Since the basis of my difficulties are the same, I hope it's okay to include both problems in the...
Homework Statement
> Figure 1:
>
> A spool is hung on a spring. A part of the coil hangs in front of a
> homogeneous magnetic field. The coil is incorporated in an electrical
> circuit. See Figure 1.
>
> the coil KLMN has a rectangle shape, has a height of 10.0 cm, a width
> of 8.0 cm, and...
1. Two charged particles are traveling in circular orbits with the same speed in a region of uniform magnetic field that is directed into the page, as shown. The magnitude of the charge on each particle is identical but the signs of the charges are unequal. Which one of the entries in the table...
I already know that the right hand rule could just as well be the left hand for the rotational motion vectors like torque and angular momentum, but what about magnetism? It seems like nature behaves strictly "right handedly" for magnetism. Is that true, or could you use the left hand rule, just...
can someone do a design of a FIR filter using the Window design method by hand as an example and post it? Please do not use mat lab. I would like to learn how to do it myself by hand. I have been have use Google but no luck .
all the pages I have seen use mat lab in their example.
So I...
Should I just assume that any problems that involve integrating factor will always result in a perfect integral pair? That's probably not the right terminology but for instance if I have a differential equation which has had an integrating factor multiplied to both sides, then the left hand side...
Here's a video: https://www.youtube.com/watch?v=iHtIPbYK_EI
I have been able to do this for as long as I can remember, and only on my right hand.
The action that I do to trigger this thing involves pressing my 4th finger onto my palm.
Doing this doesn't hurt even if done continuously...
I have a hand vacuum pump I'm using to evacuate air out of a container and hold the vacuum for a long period of time. This pump came with a valve that eventually failed. I bought a few more just like it and those failed as well. I guess the diaphragm inside the valve is too weak to hold a vacuum...
I have seen a few threads on this already on the website,but the explanations kind of confused me. I know that this rule is used to predict the direction of a magnetic force. However this approach just seems so random to me. How come when we just orient the fingers on our right hand or left...
Homework Statement
Find the left hand limit and right hand limit for x--> 2 for the function
f(x) = 2x+1 if 0 ≤ x ≤ 2
7-x if 2 ≤ x ≤ 4
x if 4 ≤ x ≤ 6
Homework Equations
Lim f(x) for x->2 = ?
The Attempt at a Solution
I honestly don't know where to start...
hi engineers
i found very rare videos
https://www.youtube.com/playlist?list=PLz4lzGv7pbZB-w6Zl_0ERvA1Ro3VeMgdo
at https://www.youtube.com/user/MechanicsForAgrEng
i hope you like it for science
so, the magnitude of the cross product represents the area or volume enclosed by any 2 or 3 vectors respectively, but what does the direction represent? i get that the general direction is one that is perpendicular to all the vectors, but what does the actual direction represent? ie, why the...
Hi,
I have a question about how to apply the right hand rule in this vector (AxB)
I would say that it is -k (missing ^) because of the smallest angle is the one drawn in red, but it is k. Can anyone explain why?
Homework Statement
I'm having problems with understanding how to use the right hand rule as it applies to forces and determining moments. If I understand correctly, The fingers point in the direction of the force, then curl in the direction of r, but I'm not sure what r would be in this...
hi all
I am asking this question for a friend and I hope some of you will give me the right answer.
if someone is thinking about pursuing a career in Mechanical engineering ,does he have to be worried about hand-drawings in case he is not a good painter?
or all drawings will be done on the...
Homework Statement
The minute hand of a clock travels 6.28 inches in 15 minutes. Find the length of the minute hand. Approximate to the nearest inch, if necessary.
The Attempt at a Solution
I figured the arc length to be \frac{\pi}{2} because it's traveled one quarter of the...
I know there are no algorithms for finding one, but what are some guidelines?
One tip I came up with is that if you have a vertex with degree 2, there is only one way to go through that vertex.
Are there any others?
Homework Statement
Calculate, by hand, the DFT of cos(2*pi(fx*m + fy*n)). It should simplify to something simple. It should NOT be left as a summation.
Homework Equations
2D DFT Formula:
\tilde{s(k,l)} = \sum_{m=0}^{M-1} \sum_{n=0}^{N-1} s(m,n) e^{-j 2 \pi (\frac{1}{M}mk +...
Homework Statement
Compute the M sample DFT of:
f(m) = cos(2*pi*(f*m)) for 0 <= m <= M-1
where M = 128, f = 1/16
This should be done by hand, and the solution will reduce to a very simple form.
Homework Equations
The Attempt at a Solution
I slaved through this problem...
Re: E=MC^2,What is E?
Moderator note: the following comment was made in another topic, and I found it humorous in a way and wanted to continue the discussion without derailing the other discussion:
Oh,are we deviating and will this affect the forum?
Homework Statement
let f: I -> R, where I is an open interval and f is a monotone function. Assume f is discontinuous at c. show that lim x→c- f(x) and lim x→c+ f(x) exist and are finite
Homework Equations
n/a
The Attempt at a Solution
Well since f is discontinuous at c we...
Right Hand Rule doesn't work for this problem?
Consider an electron near the Earth's equator. In which direction does it tend to deflect if its velocity is directed in each of the following directions?
I DON'T get this!
I know they're basically saying this:
Velocity of electron (v)...
I was reading online about the reactions used in hand warmers. One website that their version always heats up to 54 C (http://www.heatinaclick.com/Default.asp?sType=0&PageId=81390). This one works by a supersaturated fluid of sodium acetate crystallizing. Other hand warmers work by oxidation...
As opposed to guess and checking by inspection. Is there a method mathematically like with an algorithm or something to balance equations by hand (without the aid of any computer programs or anything like that except a simple calculator)?
I've been working on a Theremin Excel simulation for the past couple of months. For those who don't know what a Theremin is, it was one of the very first electronic instruments to be invented, and has two "antennas" that independently change the pitch and amplitude of a tone via hand...
I take issue with the "Advanced Engineering Electromagnetics" 2nd edition by Balanis again. In Page 156, it claimed for AR=-ve, it is Right Hand rotation, AR=+ve is Left Hand rotation.
For plane wave propagates in z direction and at z=0:
A)Let Ey lag Ex by \frac{\pi}{2}
\Rightarrow\;\vec...
Homework Statement
Evaluate
$$\int_ \ \sqrt[2]{9-x^{2}} \, \mathrm{d} x.$$
Homework Equations
U substitution
Integration by parts
The Attempt at a Solution
My teacher said it wasn't possible "by hand", but Wolframalpha provided a step-by-step solution. I'm clueless as to how wolfram came...
Is the right hand rule for determining the direction of the magnetic field, force, and current only used when the aforementioned vectors are orthogonal to each other? Or, can the RHR be used in other cases as well?
Homework Statement
"On a certain clock, the minute hand is 8 cm long and the hour hand is 6 cm long.
How fast, in cm/min, is the distance between the tips of the hands changing
at 9 am?"
Homework Equations
The Attempt at a Solution
I should be able to transform this somewhat...
omega of the second hand??
Consider a second hand in the watch. What is the constqant angular velocity.
Logicaly, i would say it travels through 1 rev in 1 min so, it is 2∏/60
However, if we look it on the other way, it has angular acceleration
so theta= (w node + w final)/2 * t gives 2∏/30...
How to determine the angular acceleration using the right hand rule??
I know how to get the direction of angular velocity using RHR. We curl up our fingers to the direction at which the object rotates relative to an aix and the thumb shows the direction. My question is, with the same analogy...
Homework Statement
I have some trouble integrating this velocity equation http://imgur.com/Ope9R
The Attempt at a Solution
i have tried myself and have come to this equation after solving for c for the condition t,s=0,s_0 however it is fine if the condition is t,s=0,0...
What form should the particular solution of a 2nd order linear non homogeneous differential equation take when the right hand side is a constant?
if the differential differential equation has the form
Ay''+By'+Cy = g(x)
where g(x) is a constant
what form should the particular...
Among its many other uses, it looks like you can use the right hand rule for screwing in a light bulb or screwing on the cap to a jug of milk!
Who said learning physics was of no practical use?