Turning Definition and 317 Threads

O hai, Physics Forums. I've came up with an idea, an amazing experiments which turns an invisible gas into butter. It may not be cheap, but could be a great way to motivate students into chemistry. Putting some pieces together in Chemistry class the idea jumped in. My main language is not...

Homework Statement How would the world change if there were no Pauli exclusion principle? Specifically, how would the band theory of metals change? a) Assume you had a small copper coin of mass 3.12 grams. How much energy would be released from the coin if the Pauli exclusion principle were...

hello everyone, I am designing Single ended primary inductor cell(SEPIC) converter. the objective is to get output voltage from 5V to 20V and 1 A current when we change the duty cycle of the pulse supplied to gate of MOSFET. when i simulated the circuit in proteus MOSFET is unable to turn off...

Homework Statement I'm asked to turn JFKK to DFF. I am always puzzled by such problems. I decided to take it step by step and first draw the truth charts and black-boxes for each: http://img204.imageshack.us/img204/6189/jkffkk.jpg I can see that in order to turn JKFF truth table to...

Homework Statement A 1200-kg car is traveling at 10 m/s on a road such that the maximum frictional force between its tires and the road is 4000 N. The minimum turning radius of the car isHomework Equations I need the equation to solve.The Attempt at a Solution 30m?

It may sound like a silly question but I really need some help. Not with the maths, I know that's beyond me I'll plug the numbers into an online calculator when I know what it is is I should be doing and that's where I need you. The set up: A random length of 25mm square tube with a wall...

Homework Statement I'm not sure if this is quite where this belongs since it's not homework really, but I just need help programming and I figured this would be the place to ask. It's related to undergraduate research I'm doing so if that's not kosher just say so! I want to write a Python...

Recently I began to think somehin which has led to a lot more questions. If traveling on a straight line and I were to flip a coin a stock standard right handed triangle would be made, due to the coin going up and down. What would the vector diagram look like if the vehicle was to be...

Hello everyone. I wanted to know if, for low wing single engine nose-driven prop aircrafts, there has ever been a measurement done, while in flight, of the actual amount of wing bending occurring during sustained level turns at a measured G force, including full power sustained turns...

Classical Mechanics: Finding force, equilibrium points, turning points... Homework Statement The potential energy between two atoms in a molecule is U(x) = −1/x^6 +1/x^12 Assume that one of the atoms is very heavy and remains at the origin at rest, and the other (m = 1) is much less...

I'm a current sophomore, with a 3.8 GPA. Doing exceptionally well in all my courses, very good at math with A's. I knew coming into the semester Physics would be the 500-lb gorilla and have spent all hours of the day practicing as many problems and understanding the content throughly. My...

Hi, All: My knowledge of physics is very rudimentary; please be patient. A friend of mine's father owns a small restaurant, asked me (as a math student) how he could save some money. All I could think of (not knowing much about either general economics nor restaurant business) was the use...

We can easily calculate that 89.5% of an iceberg is submerged. Yet occasionally icebergs turn over with possibly disastrous results to nearby shipping. How can this happen consudering so much of their mass is below sea level?

Homework Statement A car rounds a curve while maintaining a constant speed. Is there a net force on the car as it rounds the curve? Homework Equations none-concept question The Attempt at a Solution yes... centripetal force?

Hi all! A professional race-car driver is asked to make 2 different "quarter-circle" turns on a racing track. He completes them at the highest possible constant linear speed (he is well familiar with the car and the road so it's an easy task for him). Turn 1: Radius is R1=20m. Linear...

Hi! Find the x co-ordinates of the turning points of a function Y=2x^3+36x-1 Determine the nature of the turning points. I've been reading up on differentiation, I understand but I'm unsure what to do here. If someone could give me some helpful steps so I could learn to do this for...

So you have a current flowing through a wire. How do you go from that to, say, spinning a fan blade when you flip a switch? I took physics but they were more interested in teaching us obscure calculations than actually explaining practical material. If you want to know the total resistance of...

Ok, so when a car turns, the tires provide the acceleration pointing toward the center of the turn. If for some reason, I put a spoiler on my car with two rectanglular pieces, one on each side that are tilted, to the left, mocking an airplane rudder, thus when the wind has contact with them...

Hello, I was just hoping if someone could explain to me the reason why load transfer occurs on a car during a turn. I understand why this is so for braking/accelerating, but not for cornering. Thanks for the help.

Other that steam power, are there any efficient ways to convert heat to electrical energy

With so much hype going around as to Betelgeuse turning into a supernovae in 2012, wonder whether it is possible to predict such an occurrence correct to at least a decade...

This is just a hypothetical questions, but... Would it be possible to have a capacitor so large that its able to store all the free electrons in the wire in the circuit its attached to? Then, this would mean all the free electrons have been removed from the wire, thus making the wire non...

Hi. I am trying to find the classical turning points in semi-parabolic coordinates for the hydrogen atom when an electric field is being applied to it in the y-axis. I am reading an article for those who are interested called Classical, semiclassical, and quantum dynamics in the lithium...

heya i don't know if this is the right area for this question, but i am going to ask anyway, i want to turn upto 4 power sources which is 5 - 6V 0.35 - 0.8A into 10 - 15V 10A this is a link of the item/s i want to use to power it, and a link of the item i want to power...

Hey guys, I am stuck trying to create a function in matlab... x[n] = {1 0 =< n =< 4 {0 elsewhere so far I have this... n = [0:4]; x[n] = 1; but I get this error: ? x[n] = 1; | Error: Unbalanced or unexpected parenthesis or bracket. and I can't figure...

Is it possible to turn kWh into mass, and if it is could someone help me with the equation? Thanks

Homework Statement A wheel starting from rest accelerates at 1.2 rad/s² counterclockwise. A) How long does it take to turn through 60 revolutions? B)What is the rotational speed at that time? 2. The attempt at a solution I converted 1.2rad/s² to 1.885 rev/s² by dividing by 2πrad (2...

How to connect a wire to a workpiece which is spinning by turning machine ?

I am going to use tool work thermocouple to measure the temperature but i am facing a problem. I know i can use steel strip to one of the wire. but how about the second wire? If my insert is Titanium Carbide. Is it ok if i using different material from the insert to connect to second wire ...

ok, so i am not exactly sure how to do the math required to figure this out, and you can make fun of me if you wish, but what is the energy expended by a turning wheel of a car, and could that energy be harnessed and stored, all while driving down the road?

Greetings everyone and thanks in advance for any help you can offer. I am currently part of a team tasked with designing and constructing an autonomous, mechanically powered two-axle vehicle capable of making left-hand u-turns around a set track. I have designed a steering mechanism I...

Im trying to design a circuit that will delay the turning on of a light. I have three bulbs, one should turn on as soon as power is applied, the next should turn on in X amount of time after the first, and the final light should turn on in X amount of time after the second. Basically like this...

Hello everybody, I have some interest in physics and I am an amateur piano tuner. So I was reading the piano tuners forum and I stumbled upon this thread: http://www.pianoworld.com/forum/ubbthreads.php/topics/616245/1.html The discussion is about piano tuning wrenches and how the...

Hi I have an issue I am trying to solve, so far I haven't managed to get past it. I have some data for 200 points in theta from 0 to 2PI. The data is spherically symmetric so there is no phi dependence. Basically what I want to do is turn the 2D plot into a 3D by revolving the 2D plot. My...

I have been wondering about this while I was studying photons. Is it possible to turn the mass of a body to or close to zero? Just wondering.

So, I'm working on a 2D sim/game in which "people" aka circles travel around a "city" aka plane with boxes and line barriers. In the person step I'm passing a list of line segments, consisting of walls boundaries etc. and I'm having a bit of trouble when two lines meet at an acute angle. When...

Homework Statement A uniform board is hinged at A and supported by a vertical rope at P, 6.0m from A. A man of weight 700N stands at the end of the board at point B, which is 15.0m from hinge A. If weight of board is 50N,calculate the tension T in the rope.Homework Equations By principle of...

Homework Statement Hello, I have a workbook here with a question I am a little confused about, I think it should be quite simple to answer. I know the answer but I don't really understand how it is applied. I know the method but I want clarification on how it works please. The average...

i proved that sin (1/x)<1/x prove that sup{xsin (1/x)|x>0}=1 if we say that A={xsin (1/x)|x>0} xsin (1/x)<x(1/x)=1 so one is upper bound now i need to prove that there is no smaller upper bound so that 1 is the supremum suppose that "t" is our smaller upper bound t<1 and...

Tried a couple of turning points questions recently, because its going to come up on my course again soon and I was rusty. Only thing i don't get is: what happens if every derivative is 0? How do you classify the turning point, for example: f(x) =e^-(1/x) you can differentiate...

Suppose I hold a pencil by its tip and turn it around 20°, around the axis which goes through the pencil's length. The pencil's base, at the other extremity, a few centimeters away, will also turn by 20°. Now suppose this is a huge pencil which stretches from the Earth to the sun. By turning its...

I'm just doing dynamics of rotational motion and was wondering if anyone could help me with the direction the friction points when you have a rope looped around a cylinder and it starts unwinding. The book says the force of friction does no work and is also responsible for the cylinder to...

Homework Statement A wheel 60 cm in diameter rotates with a constant angular acceleration of 4 rad/s^2. The wheel starts at rest at t=0, and a chalk line drawn to a point P on the rim of the hweel makes an angle of 57.3 ith the horizontal at this time. At t 2s, find (a) the angular speed of...

Homework Statement On the segment of roller coaster track shown in the figure, a cart of mass 233.7 kg moves from left to right and arrives at x = 0 with a speed of 16.5 m/s. Assuming that dissipation of energy due to friction is small enough to be ignored, where is the turning point of this...

My previous post has been removed due to some reasons. I would like to ask another question: if a uniform metre ruler with weight of 1.2N, suspended at its mid-point from a spring balance. No other force is added to the ruler. The reading on the spring balance is 1.2N. Am I right? If...

Homework Statement We have multiple sections of a class for which we need to produce grading summaries by section. The grading summaries that we need are a count of how many students earned A’s, B’s, C's, etc., and the lowest, highest and average grade for each section. At the end of...

If I was turning in a circular motion in a car, then I hit a patch of ice making the road frictionless. Would my car just go straight? I always have a hard time on these intuitive questions.

I was wondering how you could turn an RC aircraft out to a water bomber?? I thought of installing a container in the fuselage where water could be filled but can't think of how to get water out. Any suggestions on that or any other ideas of loading the water?

1. (a)A train slows down at a constant rate as it rounds a sharp circular horizontal turn. Its initial speed is not known. It takes 16.6 s to slow down from 86 km/h to 30 km/h. The radius of the curve is 162 m. As the train goes around the turn, what is the magnitude of the tangential...

Is a matter-antimatter annihilation just a particle turning around in time, or is it a particle from the present being hit by a partcle from the future (because antimatter is matter going back in time)?