hand Definition and 450 Threads

Hello guys, First of all I have small question with the electric motor. I just learned today in class that with electric motor loops the current is reversed in the loop after 180 degrees to continue a constant movement in one direction. But my question is why is this nessecary. If we don't have...

Hi everyone, I am new here, and I am thirteen, but I am really into this and I have recently grasped (only on a basic level) quantum theory. I understand relativity and I am looking into many fields, such as cosmology. So, me and my dad were talking the other day, and he proposed the...

How colud you intergrate (4X^3-7X^2+6X-3)/(X^6-4X^3) by hand (my TI-89 gave me -[2(13*2^(1/3)-12)(√3*2^(1/3))X^2*Arctan[√3-*2^(1/3)(2X+2^(2/3))/6]+2^(2/3)+28√2+13)X^2ln(X62+2^2/3X+X^(4/3)+2(2^(1/3)(14*2^(2/3)*X^2ln|X-2^(2/3)|-6(14X^2ln|X|)+2(4X-1)))))]\96X^2 i tryed to use partial fractions...

Hey I am trying to figure out how to use the right hand rule when magnetic force points downward. I comprehend what the fingers are used for but when i but the finger downward I get a direction to the left, but the answer is that the direction is north. Why is that?

Can anyone explain how to use the right hand rule to determine whether a vector will be "into the page" or "out of the page"?

[SOLVED] hand rule application (dir of mag force) Homework Statement You witness an experiment with a wire (a part of a circuit) and a horseshoe magnet. It begins with a wire laying on a table and passing through the mag field of the horseshoe magnet, but with no current passing through the...

1. Homework Statement Let a=(1,2,3) b=(-1,2,-1) and c=(0,1,-2). Do these vectors taken in this order, satisfy the right hand rule? Explain. 3. The Attempt at a Solution I was told a cross b must equal c otherwise this is not satisfying? I'm VERY confused...can someone help out...

Magnetism! Help! can someone please explain the hand rule thing to me...i am dead lost when teacher is explaining it. All i know is that your thumb is N and the bottom of your hand is S...please help!

[SOLVED] Right Hand rule, explain please? I don't have a problem, I just have issues with understanding the right-hand rule, if someone could explain it (with pictures if possible) I would appreciate it, although it might be better in person because I could see the motion.

[SOLVED] How would one factor this.. by hand.. Assuming I didn't know the perfect square formula ( (a+-b)^2), how would I go about solving this equation by hand factoring? x^2 + b/a *x + b^2 / 4a^2 = 0 I am trying to figure out how the quadratic formula is derived, and this is one part of...

1. Use the sandwich theorem to compute the limit as n goes to infinity of the sequence with the following nth elements: a(n) = [1 + sin(n*pi/3)cos(n*pi/5) ] / [n^0.5] I would really appreciate some help with this one guys. If you could please go slow with the answer as my trig is pretty...

Homework Statement Clock hands move slowly but they do have a small angular momentum. According to the right hand rule, in which direction, with respect to the clock face, does the angular momentum vector point? Homework Equations right hand rule The Attempt at a Solution...

Combustion reaction -- discrepancy between hand calc. and computer sim I am considering the reaction C2H4O (liquid) --> CO + 0.5CH4 + 0.5H2 + 0.25C2H4 I calculated the flame temperature when the reactant is at 298 K and 20 atm using H(reactants) = H(products) to get Tfinal = 945 K. I then...

religious nuttiness reaches a new low (well I guess it isn't just religious...): http://www.upi.com/NewsTrack/Top_News/2008/01/09/man_severs_hand_to_escape_gods_wrath/1800/

Tsu happened to see this and said that it looks legit [i.e. it appears to be a genuine x-ray of a hand]. "This is what happens when you hold the firecracker for too long." http://my.break.com/content/view.aspx?ContentID=408271

Homework Statement \frac{d^2}{dz^2} [ (z^2) \(\frac{-(z-\frac{1}{z})^2}{20+8(z+\frac{1}{z})} \frac{1}{iz}] Homework Equations The Attempt at a Solution I have to do this by hand no calculators, CAS, or tables. I started by just expanding things and using the quotient rule...

Right hand rule for Spinning things... Hi, I'm havign a hard time figuring out how the right hand rule works for Angular momentum, Angular velocity and torques. Its so confusing because At university we get problems about rotating solid bodys like a disk on a rod, and when the question...

Hello all, I have to design a hand crank generator to produce power for some downstream application. The amount of power is on the order of that needed for anything between a heavy-duty flashlight to one of those desktop mini-fridges that hold one soda can. Thing is, I'm drawing a blank on...

Homework Statement Is there any simple way to factor 1001=7*11*13 by hand? Homework Equations The Attempt at a Solution

so, for the very specific cases of linear systems i can identify what shape it will be after determining the eigenvalues, but i really do not know how to go about sketching the phase planes. can someone give me a method?

Homework Statement A charged particle is moving perpendicular to a magnetic field B. The table below shows the relationships between directions of three vector quantities. Notice that one entry is missing from each column of the table. Your job is to complete the table. Enter your answers in...

Homework Statement http://img206.imageshack.us/img206/5084/71282075fy0.jpg Homework Equations There are many variations on the right hand rule, but I'm most confortable with the following. Current is in the direction of thumb, B field is in direction of fingers and F shoots out of the...

man i don't understand this stuff i have a test on thursday and i found some practice problems can anyone help me solve these( please show work) i need to learn how to do them i have the formulas i think but idont know when and which to use please help soon 1. In 1993, Bill tossed a ball...

Hello friends, I am studying in 10th class. Actually I have a question and I’m unable to solve this question. My question is: How can we find the square root of a number by hand? How about cube roots? If anybody can solve my question I will grateful. Thanks in advance!

I have been handed a challenge that is beyond my reach. I need a way to detect the change in skin conductance, or some other electrical signal on the surface of your hand when you lightly touch your forefinger and thumb together. In this configuration, the skin sensors have to be located on...

A daring ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. The constant speed of the horse is 10.0 m/s and the distance from the limb to the level of the saddle is 3.00 m. (a) What must be the horizontal distance between the saddle and the limb...

Homework Statement A proton traveling at a speed of 3.0 x 10^6 m/s travels through a magnetic field of strength 3.0 x 10^-3 T, making an angle of 45 degrees with the magnetic lines of force. What force acts on the proton? Homework Equations F = QvB The Attempt at a Solution I...

Homework Statement Not an actual HW problem, but related to a lot of probs I'm doing. Lets say a hand pushes a block across a surface (with friction). You take pic of 2 timepoints 1) when hand pushes block 2) After hand has let go and block is slowing due to friction Now when I draw the...

Question A 54.0kg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.50 turns each second. The distance from one hand to the other is 1.5m. Biometric measurements indicate that each hand typically makes up about 1.25% of body weight...

calculating SCIENTIFIC NOTATION by hand help please. ((4*10^5)(5*10^-7)) / (2*10^-3) im getting 10 and the answer but its should be 100 can you please tell me what i am so posted to do step by step please.

I need a 3/8-16 full thread (Tap) 1/2" long hex bolt with a left hand thread. Anyone know where I can get one without paying a minimum order fee.

Homework Statement http://img329.imageshack.us/img329/9304/righthandcq2.jpg The Attempt at a Solution For this method I was taught that the direction of the fingers points in the direction of velocity, the thumb in the direction of the magnetic field, and the force would shoot out of...

Homework Statement http://img71.imageshack.us/img71/8453/untitleddt6.jpg Imagine that current flow from east to west. what is the direction of the force on the current when the magnetic field B is (i) to the East and (ii) Vertically up? The Attempt at a Solution I've done a bit of...

(a) What is the angular speed of the second hand of a smoothly running analog watch? ____ (rad/s) i got 0.03 pi webassign says "Check the syntax of your response" i also tried 0.03, but it's wrong also.. how do i put my answer?

Homework Statement There seem to be three right hand rules for dealing with magnetic field, current, and force, and I don't quite understand how to use them. Namely, I'm having trouble understanding why two parallel wires with current flowing in each of them attract if the currents are in...

Estimate the maximum pressure that would be applied to your hand if oyu were told it out of an open car window while the car travles at 70mph through still ait at 20 degrees c what would be the maximum pressure applied to your hand if the car where a formula one race car traveling at 220mph I...

cos(arcsin(-1/3)) how to do it by hand?? Homework Statement Solve without a calculator cos(arcsin(-1/3)) The Attempt at a Solution now i have fount the solution to be (-2/3)(2^(1/2)) now not only did my calculator come up with that but between the SSS formula and pythagorean formula(...

Homework Statement Find the direction of the magnetic field at point P. Homework Equations See below. The Attempt at a Solution From the right hand rule, my thumb would point in the current's direction. Thus, my fingers would curl inward, so the magnetic field would point into...

Homework Statement A straight, vertical wire carries a current of 1.23 A downward in a region between the poles of a large superconducting electromagnet, where the magnetic field has a magnitude of 0.556 T and is horizontal. a. What is the direction of the magnetic force on a section of...

I need to know WHY you can't tell if you have a high fever with your own hand... I am thinking that it is because your body temp. is all equal?

How many times per day (00:00-24:00) do the hour and minute hand form a straight line together? Would this be the same for when they overlap? Say, the minute hand goes pi/1 hr and the hour hand goes (pi/12)/1 hr. Then what?

I'm wondering how people used to solve log's. I can't figure out any sort of pattern when I look at certain logs (to figure out a way to solve them by hand) so any information regarding this would be nice. I don't mean like log10(100)=2, that's obvious I mean like log10(20)~1.301, how does...

wat is the right hand rule and how do u use it.is there one for motors to.

Homework Statement Let alpha(t) be a regular curve. Suppose there is a point a in R^3 space s.t. alpha(t)-a is orthogonal to T(t) for all t. Prove that alpha(t) lies on a sphere.Homework Equations Definations: A regular curve in R^3 is a function alpha: (a,b)-->R^3 which is of class C^k for...

If a wheel is turning at 3.0 rads/s, the time it takes to complete one revolution is about: 3.0 rads/s X 1 revolution/6.28 rads = .477 revolutions/s now do I just times by 60s to cancel the seconds out to get 1 revolution. The rotational speed of the minute hand of a watch is: w=...

Hey everyone. Just a quick high school physics question about determining magnetic fields using Hand rules. The only thing I have trouble trying to understand is how to determine the way a compass arrow will point if you place it on top, or under an electric circuit. I know that they are...

Hello everyone, Another example from the book I'm going over and I'm not exactly sure how they got their answer: The game of poker is played with an ordinary deck of cards. Various five-card holdings are given special names. a. how many 5 card poker hands contain two pair? Well I'm...

I have two homework problems that have been driving me nuts: 1.) evaluate the indefinite integral: integral(dx(e^ax)cos^2(2bx)) where a and b are real positive constants. I just don't know where to start on it. 2.) Find all values of i^(2/3) So far I have...

Does anyone know of a good site that explains this rule? I just don't get it at all. Better yet, is there some way you can know the direction of the magnetic field without doing it

hmmm i have no idea where to even start with this problem, i cannot find any examples that are similar or anything like that anywhere! http://img147.imageshack.us/img147/2319/picture18ur9.png anyone got an idea as to a good first step to take? thanks sarah :) edit: i tryed something wild...