hand Definition and 466 Threads

Homework Statement This is just a sort of clarification question: suppose I wanted to know the probability of getting at least one ace in a 2card hand. My question is : can this be calculated directly or would I need to use the complement? Calculating directly, I said for the first card of...

Homework Statement A metal strip moving to the right in a B field which is going into the plane of the page. Can this problem be considered using both Fleming's right and left hand rules? Homework Equations The Attempt at a Solution If I consider Fleming's left hand rule: the negative...

Sorry for this elementary question, but I'm just trying to avoid making a mistake that will lead to a bigger problem. I'm trying to change out a water valve in my garage. The little old lady that lived here before me pulled a little too far into the garage with her car... (I'm guessing). The...

If I close my eyes (so as to remove my sense of sight) and spread my fingers so they do not touch (so as to remove sense of feeling) and then move my hand around, I still have a sense of where in space it is located. How is my brain figuring out the location of my hand under these conditions?

I'm required to diagonalize a 5x5 matrix by hand, using 'appropriate similarity transformations.' I'm not asking for an answer to a homework question, I'm asking is there any sort of easier (by hand) way of doing this than how I'm approaching it? If it matters, the matrix is as follows: A= {...

How many straight poker hands are there (not straight flush) from a deck of 51 cards with the queen of spades missing? A is high or low. I know the answer is 9435, but I want to know why. I'm not sure how to approach this problem. Any help?

Homework Statement A five card hand is dealt from a standard 52-card deck. What is the probability that there will be exactly three suits in the hand? Homework Equations The Attempt at a Solution I started with (4 C 3)(39 C 5), but this gives me all possible hands with three or...

So I finished a phd a few years back, and I've finally settled into a stable job that's pretty far outside the field (data mining for an insurance company), so I'm brainstorming for ways to keep a hand in physics while working outside. I've contacted former collaborators about potentially...

Hi everyone! I'm trying to work out a physics problem using Lenz's Law, but I'm having trouble with the Right Hand rule, which as I understand is supposed to be used to solve the problem. 1. Basically, there are 2 copper wire loops, Loop A and Loop B. They are lying flat on the table. There...

I'm trying to solve problems about magnetic fields of electric currents induced by charged particles and wires. Most of these problems require the right hand rule, which I don't really understand. All I know is your thumb points in the direction of the current and your fingers curl in the...

Solved it.

what rule hand rule shall be use in determining the direction of magnetic field in a single circular loop..pls. help me

I would like to draw plots by hand. Which means I can create the plot, label the axes, and then draw lines on it without having to write their equation. I can also control how the plot looks visually, such as color, scaling etc. What program can I do this with? More specifically, can I do...

how did maxwell arrive at the conclusion that the direction of magnetic field is the way our fingers curl , with thumb in direction of current ?

Hi all. I'm studying deep inelastic cross section in parton model. In particular I'm referring to Halzen-Martin's "Quarks and leptons" section 8.5, but I think this is a quite generale procedure. In studying the deep inelastic scattering by e- on proton it cuts off the electron part and work...

Just want to ask if the moment diagram of Cantilever beam with fixed end at left is the same as with fixed end at right. What I mean is that they are just mirrored ? Thanks

[URGENT] Need help with my homework! 45minutes left till i have to hand it in Homework Statement a) Bianca wants to make a solar cooker to take on her camping trip what type of mirror does she need? b) Bianca makes a mirror by putting silver foil on an old, cut-up beach ball. The ball...

When I placed the south end of a magnet on the right hand side of the green CRO spot (when timebase is off) facing towards the left hand side of the screen, I expected the spot to move downwards in accordance with the left hand rule, but instead it moves upwards. The spot also moves down when I...

Hi, folks. I'm new here and came looking for some expert input on this odd question that came up as a friend and I were considering a hypothetical. Suppose a hand grenade were orbiting the sun---say, half way between the orbits of Mars and Jupiter. And to make things easy, suppose that the...

Homework Statement I need to draw an orthogonal RHS of an object I have attached as a pdf file with the message for an assignment. My problem is I do not know what the RHS of the drawing would look like. I know how to use autocad to do drawings but I'm stuck when I need to envisage the...

Hey guys, I have a simple conceptual question: Let's say I'm moving a loop of wire into a constant magnetic field that points into the page. The wire needs to create a magnetic field out of the page to oppose this previous change in flux. The typical question would be which direction does the...

Hello, my calculator (sharp el-w516) can generate random fractions like 237/431. I was curious if there was a way to do this by hand. I would like to be able to roll any sided die by multiplying the random fraction by the side number. For example if I wanted to roll a d20 I could take the...

Hi there. I'm basically trying to understand why when 2 wires are place near each other, given a current in the same direction they will attract each other. I have read a this: https://www.physicsforums.com/showthread.php?t=39472 But I don't see how some say 'generates a magnetic field...

So I want to be able to draw the phase portrait for linear systems such as: x'=x-2y y'=3x-4y I am completely confused, but this is what I have come up with so far: Step 1: Write out the system in the form of a matrix. Step 2: Find the eigenvalues and eigenvectors for the matrix. Step...

If you have a standard deck of 52 cards, what is the probability that out of a hand of 5 cards you get 4 aces? First I found the total # of ways for choosing 5 cards from 52 = (52 C 5) = 2,598,960 Then the # of hands which has 4 aces is 48 (because the 5th card can be any of 48 other...

is there "cheap" / high productivity way to measure quality of hand tools? I see online a common complaint that widely available tools have become low quality due to offshore outsourcing, cost cutting, corrupt/lying mislabeling of alloys used etc. Conversely, tools of "proven" brands that have...

Hello all, I was wondering if any of you have a good method for checking your answers to linear systems of equations(when working by hand). I mean the sorts of equations you would encounter on a first university linear algebra course. I solve the system with Gauss/Gauss-Jordan elimination...

Homework Statement \stackrel{lim}{x\rightarrow 0}\frac{cos^2x-1}{2xsinx} Homework Equations \stackrel{lim}{x\rightarrow 0}\frac{1-cosx}{x}=0 \stackrel{lim}{x\rightarrow 0}\frac{sinx}{x}=1 The Attempt at a Solution I found this problem online (and can't remember where). It...

Homework Statement Its just a general query about problems along these lines... f(x)=|x^2+3x-18|/(x-3) and a =3, discuss the limiting behaviour of f(x) as x→a^+, as x→a^- and as x→a. Homework Equations The Attempt at a Solution So my basic solution to these types of...

Hi On page 11 of this book, http://books.google.dk/books?id=Wv2OIC_SaDUC&printsec=frontcover&hl=da#v=onepage&q&f=false, it is stated that: "The phase modulation has an additional advantage: The first two sidebands at frequencies ω+Ω and ω-Ω have equal amplitudes, but opposite phases. A lock-in...

Homework Statement Options: -z +z -y +y -z +z Questions: Situation (1), q positive: Situation (1), q negative: Situation (2), q positive: Situation (2), q negative: Situation (3), q positive: Situation (3), q negative: The Attempt at a Solution Situation (1), q...

Homework Statement A baseball player catching a ball can soften the impact by pulling his hand back. Assuming that a 5-oz ball reaches his glove at 90 mi/h and that the player pulls his hand back during the impact at an average speed of 30 ft/s over a distance of 6 in., bringing the ball...

I come across questions where I have to match the equation with its contour map and graph. Examples: z = sin(xy) z = sin(x-y) Right now I'm using Wolfram Alpha for all of these, but supposing these appear on an exam... how do I graph it by hand? :confused: For example, for z =...

Homework Statement Consider the following intervals: A = [-3,5), B = (3,8), C = (0,4] Find: A\capB and A\capC The Attempt at a Solution I thought that: A\capB=(3,5) and that A\capC=[0,4] as that is the intersection point, but this book (Schaum's Probability Outlines) says that A\capB=[-3,8)...

Ignition Coil Won't Spark from Mosfet but DOES spark By Hand? HELP!? I'm trying to get an ignition coil to create sparks running it with a Mosfet powered by a 555 timer. The Mosfet is definitely switching. I checked it with resistor, ampmeter, and o-scope. Everything is behaving predictably...

Homework Statement (i) Find the magnitude and direction of the magnetic field at the point O located at a distance D = 10 cm from a wire carrying a current i = 1.0 A directed into the page, as shown in the attached drawing. (ii) A second wire, identical to the first, is placed a distance D...

Hi all! I'm new here. I'm a mechanical engineering student at ODU and I'm designing a hand car. Yes, like the ones that ride on train tracks. This is being designed for the Santa Rosa California Hand Car Regatta and will be pedal powered. The HCR is part art show/part drag race and I'm...

Hi, i do not understand why i can find the FT of sin in mathematica using the built in function but not by integrating, even thoiugh they should be the same: Integrate[Exp[i(ω-ω0) t,{t, -∞, ∞}, Assumptions ->ω0 el Reals && ω el Reals] but the statement FourierTransform[Sin[ω0 x]...

I have a question regarding second hand smoke and its dangers, I hope this is the right place to post it. I have been told how dangerous second hand cigarette smoke is, I have also been told that it is impossible to fail a urine test due to inhaling second hand MJ smoke. So which is it...

Homework Statement Consider the following Z tranform X(z)=\frac{z^{-1}}{1-2z^{-1}+2z^{-2}} Calculate the poles and resides by hand. Homework Equations To find residue at pole p1 (z-p_{1})X(z)z^{k-1} Evaluate at z=p_{1} The Attempt at a Solution OK so I've taken the X(z)...

Hi. I'm a freshmen student in the Biochemical Engineering major. I like doing math and physics a lot, because I find the topics very intriguing, stimulating, interesting, and fun. I love that it is all logic and it learn them will allow me to learn how our world works. However, I do not feel...

In his PBS series videos, Brian Greene states the reason being electromagnetic forces between the charges in my body and the object (falling human and the ground in this case) In her book 'Warped Passages', Lisa Randall states the reason being the Pauli's exclusion principle for the fermions...

Can somebody please explain ( properly)with examples , how the right hand rule describes the direction of coriolis acceleration? please!

Homework Statement The problem is given in the following image. http://img46.imageshack.us/img46/2972/lskfjsf.png Homework Equations ∫h(r)*dr = ∫h[r(u)]*r'(u)du The Attempt at a Solution I was able to figure out plugging in (t^2+3) at every x and sin(1/2πt) at every y. I then set...

Why we take right hand and left hand limit of a function? what actually we are trying to find on that time? asymptotes or ...?

I want to create a handcrank to spin a DC motor at 24000 rpm. The DC motor is an 18V hobby motor from radioshack. Is this possible?

If I wanted to create a hand crank to spin this dc motor... I want to create a handcrank to spin a DC motor at 24000 rpm. The DC motor is an 18V hobby motor from radioshack. Is this possible?

Question about "right hand rule" for physics My school doesn't offer physics for freshmen right now, so I'm self studying it. Regarding the right hand rule for vectors, I'm slightly confused. I did excellent using it in mechanics, it was relatively simple, but I was at a loss as to how to use...

Alright, so I am building a hand crank generator, and my goal is to replicate the K-tor pocket socket. http://www.k-tor.com/ The goal is to power a universal powermat with the generator. I need to produce 10watts at 120volts, and my group is completely lost. If anyone could provide...

Homework Statement Why do you need to start this Stirling engine by hand? Homework Equations N/A The Attempt at a Solution there is not sufficient power at first to overcome the inertia, so external work in the form of pushing it by hand is needed. however once started the momentum of the...