hand Definition and 450 Threads

Homework Statement Known: - Mass of the chopstick - Gravity Homework Equations So the alpha(angular acceleration) can be found The Attempt at a Solution By knowing angular acceleration, I successfully wrote a program that simulate a chopstick falling onto my hand. But all of...

I need to build a hand cranked generator that can create enough electricity to maybe charge a cell phone. How would I do this?

"Keeping a pencil standing on your hand" What physics topics should I research? Hi. My English is not perfect but I'll try my best. This is not a homework. It's a programming question for my simulator project. Scenario: - A pencil standing in your hand. It will fall or stand depending on how...

I have repeatedly run across the right hand rule of thumb but rarely have i found anything on the left hand rule of thumb. any ideas as to why this is?

Homework Statement When you rub a rubber rod with fur it becomes negatively charged. How does it keep it's charge if it's in your hand? Homework Equations The Attempt at a Solution We did this in the lab and it definitely stays charged (at least long enough to observe some...

Homework Statement I have to create a function which determines which hand is the winning (3-card) poker hand. import random from subprocess import Popen, PIPE from bpipe import * from time import sleep class Card: def __init__(self, suit='club', rank ='A'): self.suit = suit...

Anyone knows how to plot a simple probability plot by hand (manually) without using statisical software?

What is the rotation rate in revolutions per minute of the hour hand of a clock? a.) 1/(12x60) b.) 1/24 c.) 1/(24x60) d.) none of these I am not too sure how to answer this, i want to say its (a.) because it makes the most sense... ??any suggestions??

Throughout the electric force/field and magnetism unit, there's always a rule that involved using the left hand and the right hand. I'm a bit confused on how to apply the rules because of the units are applied to different fingers. If someone could give me an explanation on it, that'd be great...

Homework Statement http://img41.imageshack.us/i/photolu.jpg/ Homework Equations Right Hand Rule The Attempt at a Solution I have to find the moments at B. I know I have to use the right hand rule to figure out which force has a positive and which force has a negative action...

Assume that a uniform magnetic field is directed into this page. If an electron is released with an initial velocity directed from the left edge to the right edge of the page, which of the following describes the direction of the resultant force acting on the electron? I think it would come...

Hey, new to the forum. I'm currently taking my first programming course, and in one of the assignments, I was asked to trace the following Fortran77 program fragment by hand and determine the final values for n and m: integer n, m, k, j n = 0 m = 0 do k = 1, 3 do j = k, 1, -1...

Hi, I need to evaluate \int e\stackrel{-(r/R)}{}sin(qr/h)dr between r=0 and r=\infty but I keep getting stuck. I hae tried integrating by parts but the integral just keeps getting more complicated, and I have tried substituting in sin(x) = (1/2i)(e^ix - e^-ix) but that gave me the result...

1. Homework Statement [/b] Suppose in the figure that the four identical currents i = 13 A, into or out of the page as shown, form a square of side 64 cm. What is the force per unit length (magnitude and direction) on the wire in the bottom left hand corner? (N/m) Take the positive y direction...

Hi ! I have many questions and I did try to answers them, but I want to know if I am incorrect. 1) Which reacted faster, foot or hand ? try to use Newton explanation I think the hand will react faster because it is closer to the brain... to send signal, but I am not sure how to explain that...

Hello everyone, First post here so be kind :) I am working on a problem, that should be easy, but I just want to make sure my logic is correct. The problem is to find the probability of being dealt event A in a 5 card poker hand, where A = {2 pair and 1 card all of the same colour} Now I...

http://news.ninemsn.com.au/world/863766/snake-born-with-hand-shocks-scientists Some kind of genetic mutation perhaps?

Homework Statement You will assess the probability of a certain hand winning after the starting hands are dealt. You only need to consider two players at a time. (At no point are we considering betting or folding playing a part in winning) Starting Points -Try and watch some games of Texas...

I hope I am asking this in the right forum. Lets say you have a simple hand pump, similar to a bicycle pump, and you exert X amount of force on the handle. How do you calculate the resulting air pressure it creates out of the small valve at the end? Obviously friction between the O-ring...

Homework Statement Use the definition of the definite integral (with right hand rule) to evaluate the following integral from -3 to 2 \int(4x^2-9x+2)dx Homework Equations \int from a to b of f(x)dx = limit as n\rightarrow\infty of \sum f(xi)\Deltax. i = 1The Attempt at a Solution I found delta...

If anyone here has experience with hydraulic hand pumps(those 10000 psi models), could you tell me how hot the oil, and by extenstion the pipes get during compression?

The minute hand of a clock is 5.5 cm long. What is average velocity vector for the tip of the hand during the interval from the hour to 20 minutes past the hour, expressed in a coordinate system with they-axis toward noon and x-axis toward 3 o'clock? (Answer in terms of i-hat and j-hat...

Homework Statement A man lifts a 1.9 kg stone vertically with his hand at a constant upward acceleration of 1.5 m/s2. What is the magnitude of the total force of the stone on the man's hand? Homework Equations F=ma The Attempt at a Solution I used this equation but got the wrong...

Homework Statement For this given diagram, determine whether the particle is a proton or an electron. 2. The attempt at a solution Considering at the point where it enters the material. Using RHR, Velocity is downwards (First Finger), Field is outwards (Middle Finger), Thumb points left...

Hello, I noticed that with my radio sometimes when I am getting static if I bring my hand close to the antenna, the radio suddenly becomes clear and I can hear the station very clearly.I can either touch the antenna with some metal, or more dramatically, I just bring my hand close to the...

I think I know what Fleming's left hand rule but how does Fleming's right hand rule come about and why is it opposite for generators? Is Fleming's right hand rule just the left hand rule for electron flow (instead of current) or would it be more proper to use the left hand rule in that case but...

Ok... so I know the direction of the force is east, the direction of the velocity is north, and the Magnetic field is out of the page. So I am trying to determine what charge this particle is. The answer is positive but I don't see how that's the answer. Look through my work please, to see...

any way to solve 3x^8-20x^6-12x^4+12x^2+1 by hand

I'm fairly new to astrophysics, but I'm genuienly interested on knowing how to calculate orbits. I've been trying to do so on my own but I just find myself extremely frustrated. :confused: I'm trying to figure out what orbital vectors are and how i can calculate them using known orbital...

This indicates that sense of body position is arrived at by input from sight, touch, and proprioception, and that, when the stimuli are inconsistent, sight and touch are "believed" by the brain over proprioception: http://www.sciencedaily.com/releases/2004/07/040702093052.htm...

Any insight as to how they lived, what they owned, ate, housing.

1. What handedness are you? 2. What major functions do you perform mostly with your right hand? With your left hand? Ambidextrously? I am primarily right-handed. I usually use my left hand to aid the right. Although my right hand is more social, stronger and coordinated, my left is...

Homework Statement It's not a specific problem. I am just having trouble understanding the right hand rule itself and it's application. What variables do you take into account when you are orienting your hand to get the direction. For example, I understand your fingers point in the...

Homework Statement Decide from the following list of possibilities what is the appropriate direction of the force on the wire for each of the diagrams 1 through 4: A: up; B: down; C: left; D: right; E: into the page; F: out of the page; G: None of these; H: No force Input the answers...

Homework Statement In the following you are given a 5-card hand from a 52 card deck. a) given that you have at least one ace, what is the probability you have at least 2 aces? b) given that you have the ace of diamonds, what is the probability that you have another ace? c) given that you...

Homework Statement The figure shows scale drawing of a pair of pliers being used to crack a nut, with an appropriately reduced centimeter grid. Warning: do not attempt this at home; it is bad manners. If the force required to crack the nut is 300 N, estimate the force required of the...

Is there a way to quickly calculate a log by hand? It needs to be "quick & dirty", much like other arithmetic done by hand (i.e. it doesn't have to be pretty, but needs to be quick and accurate, or at the very least, a very accurate estimate). The only thing I can think of is trial & error...

Homework Statement Homework Equations I trying to figure out if how will you know if which of the following h(x) will be the right/left hand limit as x approaches to 0, as x approaches to 1, as x approaches to 2? I'm confused... please help The Attempt at a Solution I really don't...

Homework Statement What will happen to the two wires shown in the diagram (in the attachments)? A: nothing will happen B: repel each other C: attract each other The answer is "B", they will repel each other. Homework Equations The Attempt at a Solution I thought it would...

hand cranked radio question (ignore - figured out) Your two friends argued whether they should crank more cycles (e.g. 180 cycles in 1 minute) or longer time (e.g. 180 cycles in 2 minutes) to efficiently charge the internal batteries. They couldn't conclude with their knowledge and decided to...

Homework Statement I am confused on the drawing below, is the direction of the torque exerted by tension T1 positive or negative? http://img444.imageshack.us/img444/5190/katrolrh3.jpg http://g.imageshack.us/img444/katrolrh3.jpg/1/ Homework Equations The Attempt at a...

Does anybody have any idea of whether or not a non-metallic trigger could be used in sodium acetate heat packs. The crystalisation preocess in the packs is triggered by bending the metal disks inside them which causes heterogeneous nucleation. Are there any plastics which could work where...

The other day on the radio the DJs were arguing over whether or not you should tip the cable guy after he comes to your house and fixes your TV. Uhhhh why? Why should you tip someone for doing their job? Why should I tip the mailman or garbage man for doing their jobs (which a lot of people...

Can someone give me a hand with these questions because I am really stuck on these! I am stuck on both these questions, I have no idea where to begin I was given a worksheet which our instructor will review with us but I would like to know how to do them before class. I finished most of it but...

Any areas in maths that's hand wavy? Is so where?

Homework Statement What is the angular speed of the tip of the minute hand on a clock, in rad/s? Homework Equations I thought the equations needed would be angular velocity= change of theta/change in time. The Attempt at a Solution I worked on this one and am sure it has a...

sin-1(-1/2) Can someone explain how to do this problem by hand. Thanks.

Homework Statement ok can someone tell me how to determine if three vectors form a right hand triple? and why does (a-b)x(a+b)=2(axb)... please someone help, I am really confused on how to do these... arent just three vectors a right hand triple if the dot product between them all is 0?? I...

Homework Statement Find the probability of a bridge hand (13 cards) with the AKQJ of spades and no other spades. Homework Equations P(event)=\frac{\# \ \\favorable \ \\outcomes}{total \ \# \\outcomes} nCr=\left(\begin{array}{c}n\\r\end{array}\right)=\frac{n!}{r!(n-r)!} There are...

Homework Statement http://www.cramster.com/Answer-Board/Image/20073231626286331026398833900007956.jpg This is not problem. I just having trouble understanding the basics. Please just tell me right away, don't 'assist!' I trying to understand the right hand rule. Here are to...