Turning Definition and 309 Threads

I've got a Lenovo y510p laptop, and I can hear the hard drive spinning up and spinning back down about once every 30 seconds to once every 2 minutes while I'm using the laptop normally. It's starting to drive me crazy and it's distracting. I'm wondering if this is affecting the lifetime of my...

Homework Statement I understand how to solve for stationary points, and then take the second derivative and input the values of x to determine the nature of the stationary points, if x > 0 then the stationary point is a minimum and if x < 0 then the stationary point is a maximum. What I am...

So I sucked at science and math in high school, therefore my foundation in these subjects sucked. Senior year I had a biology teacher that really allowed me to discover the wonder of science and to ask deeper questions about biology, physics, the universe, etc. So I changed from my...

Hi Everyone, I'm in my early '30s and majored in liberal arts. In doing so, I took a couple years of physics as electives toward the end of undergrad. Between then and now, I've developed a strong interest in physics and it seems to be the one subject, out of every school and life subject...

Homework Statement [/B] A Velocity vector: V = (12,4) write the vector as a vector function of Displacement. 2. The attempt at a solution I integrated the components of the Vector and got the function S(t) = (S(12t), S(4t)) I this correct at all?

Homework Statement A forklift truck of weight W has dimensions shown in the figure below. Its centre of gravity G is mid-way between the front and the rear axles. When a uniform block of weight w (w < W) is placed on the front forks as shown, how the load on the rear axle will change...

I'm wondering if I'm right or wrong. question is Apply differentiation to determine the co-ordinates of the turning points on the graph Y=X3-6X2+9x and finf max and min turning points

Homework Statement Show that a solution to y' = y(6-y) has a turning point when y = 3. The Attempt at a Solution If y has a turning point, then y'' = 0. I find that y'' = 6 - 2y. If i solve 0=6-2y i get y =3. But how do i know that this is a turning point? yes, y'' equals zero, but don't i...

So I am awere of everything in electromagnetism in physics,but lately I am enjoying in creating RC cars.But I only got to making a car going only forward,how can i make him turn?How could I transform only a part of the electrical energy into mechanical so that my RC car can turn left and right...

I want to know the equation by which we can calculate the turing radius of a car with respect to speed or track length as I am designing a racing track for my thesis project. Regards, M.Tayyeb

Hi All, I have a very basic , bare-bones phone, with no web access. It does allow, though, for others to leave recorded (sound) messages.The phone does have a USB port, and I do have a USB cable. Now, my question is, how can I turn a recorded message into a file I can store in my computer? The...

This really isn't a HW problem, but this seemed like the best place to post my question. Imagine a modern city's water cycle. Clean water is obtained from a river or from groundwater, and this water is used for drinking, bathing and industrial uses. Afterwards the water is fouled...

Hello everybody, I've been lurking around this site for a while & finally decided to join. I would appreciate any input I can get! Situation: 1. I'm an international student in New Zealand and am about to gain a 2nd mates license for working on board ships internationally. While I have...

I have a function: f(x) = Asin2(x) + Bcos2(x) + Csin(2x) and I want to find the minimum turning point(s). To start with, I calculated: f'(x) = (A - B)sin(2x) + 2Ccos(2x) Therefore, turning points occur when f'(x)=0, or: tan(2x) = 2C / (B - A) To find the minima, I then want to...

Hey all, I've been accepted to an awesome internship at a national lab this summer. The funding is excellent, the location is close, and my mentor seems excited for me to get started. He recently sent me a lot of documentation detailing the project and the instruments I'll be working...

Hi I have been looking for some simple equations that describe the turning moments on the rotor as wind direction changes. I know this can be relatively complex but I am looking for simplified equations. Has anyone got any information where I can find these? The wind turbine is a small...

Hi Guys, If I were to build a model car, with each wheel having it's own servo, then how can I make it turn in one direction. Say if I want to turn left, if I cut power to the front left and reduce the speed of the rare wheels will the front left wheel act as a pivot? Or should I cut power of...

Homework Statement Hello. Will someone please explain to me why this is true? arcsinh(e^x) = ln(e^x + √(e^(2x) + 1)) 2. The attempt at a solution I cannot figure out why arcsin is able to be put into terms of ln. Thank you in advance.

I liked this problem because it's something you can use to talk about money savings w/ other people. Just making sure everything was done right though. Homework Statement the interior temperature of the room is typically 34.6°F ( the thermostat is typically set for 70.7°F. you propose to...

My textbook says : "The friction force on a car turning a corner does no work." I agree somewhat. However, if there is no work, there is no change of speed, aka no change of kinetic energy. How can a car in a real-life stop if it is doing perfect circles with forces pointing towards the...

Can someone explain the link between the turning point (local max, min & stationary point of inflection) and it's relationship to derivatives. Let me clarify what I understand (feel free to correct me). If we derive an equation and let it = 0, the value of x is some kind of turning point...

i am still newbie , i don't even know if this question should go here or not , but i will ask it anyway. I have a rod that moves vertically , i need use this rod to make a shaft turn. So i had an idea, what if i made this rod toothed and make it move a gear as it goes up , will that work? if...

I was thinking about this when I was trying to work out a simpler way of finding the volume of a sphere. Suppose we cover a hemisphere with a piece of pliable thin cover. Stretching the cover flat would make a circle. The circumference of the sphere is 2*pi*r. The distance along the surface of...

Homework Statement A vacationer gets into his out-board motorboat and leaves a dock on a river bank for a day of fishing. Just as he turns upstream, he hears a splash but pays no attention and continues cruising at normal speed. 30.0 minutes later he realizes that his watertight lunchbox is...

I've been trolling for this answer on the Internet but can't find a simple explanation. If I have two airplanes of different mass, both flying at the same speed, which plane has the larger turning radius and why? It seems like the more massive plane would require the larger turning radius due...

i was messing with a friend of mine, constantly switching his bed lamp on and off; he said that's how light bulbs get burnt out. I don't understand the physics behind this. All that's happening is an alternating on and off AC power going through the light bulb. is it the arc at the switch site...

Hello Physics Forums, this is my first thread here. My daugher of 9 years is getting interested in the moon and tides and those things. And she askes me a peculiar question which I could not answer. It goes as follows: If you put a strong rockets on the moon which turn/spin it on the spot...

Friction opposes motion. When a car is turning around a curved road, the friction between the tyres and the roads provides the necessary centripetal force. That is, the frictional force would be in the same direction the driver is turning in. So would motion of the wheels be opposite to...

The figure below shows a section of the human forearm in equilibrium. The weight of the object in the hand is 60 N. The centre of gravity of this object is 32 cm from the elbow. The bicep provides an upward force of magnitude F. The distance between the line of action of this force...

This is the silica gravel that I already own: http://images-en.busytrade.com/174645700/Silica-Sand.jpg If I compare to the other silica form such as below silica powder: http://whitefieldminerals.com/documents/product/170e23da48aa40aca37e3a62b3f92023_12.jpg"]silica[/PLAIN] powder...

Hi, this is my first post so if i made any noob mistakes have at me I can best formulate my question in the form of this If I'm driving a car at 100kph, and someone the kleenex box form the back seat at 30kph, then it moves at 30kph relative to me but in actuality is moving at something like...

Homework Statement A bicycle with 0.8 m diameter tires is coasting on a level road at 5.6 m/s. A small dot has been painted on the rear tire. What is: a) the angular speed of the tire b) the speed of the dot when it is 0.8 m above the road in m/s? c) the speed of the dot when it is 0.4 m...

Can I make a 90 degree turn on my 20 foot wide road pulling a 40 feet long and 10 feet wide cotton trailer? The cotton trailer has two axles in the rear and two axles in the front. I am an organic farmer and wish to employ a...

Homework Statement The hydrogen molecular ion H1,2, with one electron and two protons, is the simplest molecule. The equilibrium spacing between the protons is 0.11 nm. Suppose the electron is at the midpoint between the protons and moving at 1.5 * 10^6 m/s perpendicular to a line between the...

I am a 25 year old male and my hair is starting to turn gray at a rapid pace and it feels like straw. When I was in my teens, my hair was jet-black and very smooth and shiny, now it looks and feels completely different. Is this unusual for someone my age?

Find the equation of the tangent to the curve xy=4 at the point P whose coordinates are (2t,2/t). If O is the origin and the tangent at P meets the x-axis at A and the y-axis at B, prove (a) that P is the midpoint of AB (b) that the area of Triangle OAB is the same for all positions of P...

Homework Statement Homework Equations F = ma The Attempt at a Solution First off, to keep the car from skidding to the side we want it to be constrained to move in a circle about the center of the turn because if it skids then it has deviated / veered off tangentially at some point...

I've been trying to understand this: http://www.batesville.k12.in.us/physics/phynet/mechanics/circular%20motion/an_unbanked_turn.htm What I can't understand is why the frictional force equals the centripetal force. As the car turns, the frictional force should be opposite (antiparallel) to...

Could someone please explain exactly how the omega effect works? It is supposed to explain how a poloidal magnetic field (of the sun for example, or a black hole accretion disk) becomes toroidal. This is supposed to be due to differential rotation and the inertia of mass. But I just don't see...

how can you tell if the frictional force is great enough to keep a car turning a curb in circular motion based on the coefficient of friction and the normal force?

2. A group of students performing Newton's Second Law experiment generated the graph shown below from their data. Which of the following statements is true regarding the trustworthiness of the data? (Select all that apply.) a) The graph should have a positive y-intercept because a certain...

Homework Statement a particle of mass m is contrained to lie on along a frictionless,horizontal plane subject to a force given by the expression F(x)=-kx. It is projected from x=0 to the right along the positive x direction with initial kinetic energy T(o)=1/2kA^2, k and A are positive...

Hi, I have a question related to the DC motor that i hope you geniuses can help me with. By Fleming's Left hand rule, there is an induced forced (IF in diagram) at the downwards position at the armature AB. Thus, by Fleming's Right hand rule there is an induced current (IC in diagram) which...

Turning FETs "off" in presence of AC signal at Drain or Source Hello, I have a very interesting problem that surprised me, and as of yet have not been able to find a solution for. I have two coupled coils. One is being driven by a pulses. The other coil has FET switches to switch the...

Does anybody know of a term for the logical fallacy of attempting to soften the damage of a factual statement by trying to play it off as an opinion?

Hi everyone. I've been having this discussion with a pal regarding what affects the grip of a motorcycle's tires when turning and I was hoping someone in here could enlighten us :) So, we have a motorcycle that is making a turn at a constant speed and leaned in an angle. How do you...

Hi! :) I'm confused about the direction of the friction vector when we decelerate and when we turn. I've memorized the directions (if I decelerate going east, friction is aimed west; if I am in a flat circle and going around it, friction points to the middle), but they don't exactly make sense...

Homework Statement Very simple: I want to allow my existing Java program to run in a browser. Very simple. I don't want to change any code around, I just want to open it in a browser instead. I have read many tutorials online, and they require that I add weird methods like destroy, init...

Homework Statement In a certain area there are n villages linked by a network of roads in such a way that exactly three roads meet in each village, and none of the roads meet between villages. Prove that if someone starts in one village and moves round this road system alternately...

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...