What is Pull: Definition and 326 Discussions

I have read a discussion about a centrifugal fan on a wheel system The fan pulled air to itself and push the air outward from center. Most flying machines that I aware of push air down, as Newton describes. Since air is move downward, but toward machine could a new drone work this way...

I tried to make the title as descriptive as I could without being overly long. Anyway, I've been trying to work this out but I'm having some difficulty. We all know the strength of the electromagnetic force is very much greater than the gravitational force. I'm not sure what it is as it's a...

Advice request -- design a toy steam engine and do a pull event Hello, Please do forgive me if this is inappropriate use of this sight, I'm looking for general advice, any suggestions as to where I could get information and thoughts on the subject are welcome. I've taken a challenge to...

Homework Statement Figure shows a section of a cable car system. The maximum permissible mass of each car with occupants is 2800 kg. The cars, riding on a support cable are pulled by a second cable attached to the support tower on each car. Assume that the cables are taut and inclined at θ=...

I hope I posted this in the right section. Here are two questions I have. 1) If I pull on a very heavy object, that object's mass resists my attempt to accelerate it. This is known as inertia. When that object resists my attempt to accelerate it, it essentially pulls back on me with an equal...

Homework Statement Two girls pull a sled across a field of snow, as shown in the diagram. A third girl pulls backward with a 2.0 N force. If the mass of the sled is 10 kg, determine its instantaneous acceleration. Homework Equations F=ma The Attempt at a Solution Sorry, I'm stumped.

Homework Statement Hello, I am suppose to provide an equation to calculate the force that a disk magnet pulls a steel ball with respect to the distance between those two objects. My idea is to calculate the difference between the energy density with and without the ball and then calculate...

Hello, I'm new to this forum with little knowledge of physics. Does anyone know how to calculate the force created by pushing and pulling on object (i.e. a car stuck in the snow) versus pushing versus pulling? I.e., which of the three forces is the greatest? My physical experience...

I'm trying to predict the possible pull force of some electromagnets from the following equation: FPull= ( n x I ) 2 μ0\frac{A}{(2 g ) ^ 2} F : Force. n : Number of turns. I : Current. μ0 : permeability of air. A: Area in m2 g : the gap that is separating the electromagnet and the object...

bollard pull is the zero speed pulling capacity of a tug . it is measured using a load cell or dynamometer . so its unit is obviously N or KN ; but it is also measured in tonnes . how this conversion from KN or N to tonnes is done? TY

Any idea how to work out the range of torque required to pull a 737-800? To start of with need to work out the centre of gravity, with 15-25% of total weight being in the nose. Any idea how to to this? (This is not homework btw)

Dear friends, I was wondering what would be the necessary amount of energy to pull out the closest electron of an iron metal. I read that the energy required for the most distant electrons of the iron metal is about 9 thousand KJ/mol. Thanks my sages@

I have a question regarding magnetic pull. Is there anyway that a magnet can be attracted to its optimal pull to another magnet and then weakened for separation in any way? So basically I'm wanting to know how to weaken the magnetic attraction force once the magnets have attracted (without...

How much does gravitational pull on an object decrease if the distance is increased 10 fold for example? If planet x is stationary and part of a binary star system where star y is 1 AU away from it and star z is 1,000 AU's away, but also has 1,0000 times the mass, which star will exert more...

Homework Statement A jet is diving vertically downwards at 1200kmh^-1. If the pilot can withstand a max acceleration of 5g before losing consciousness, at what height must the plane start a quarter turn to pull out of the dive. Assume the speed remains constant. The Attempt at a Solution I...

Homework Statement Which law determines the strength of a pull between two objects A. Newtons first law B. Newtons second law C. Newtons law of universal gravitation D. Newtons third law Homework Equations None The Attempt at a Solution I say it is c because a pull is a...

Homework Statement So in class we are learning about electric charge and we were shown a video of a small ball being attracted to a larger ball by an electric charge. We are given some data about the balls below. There are two questions associated with this problem. (we are trying to prove...

Homework Statement A dog pulls the rope of a 50 kg sled up a hill with an incline of 20° above the horizontal. The rope is directed 30° from the slope and the dog exerts a force of 200N on the rope. The force of friction is 50 N. What is the sled's acceleration? 2.The attempt at a...

Hi All, Assume we have a package that we want it in an orbit with highest possible speed. In which orbit (low,mid,high) the package will rotate faster ? Due to smaller distance, low Earth orbit should allow more speed but there is also more air friction there. What would be the mathematical...

Hi, I'm sure this topic has come up before, however, it was always under the requirements of being realistic, i.e. taking drag, air resistance, Earth rotation and what not into account. Also, I couldn't find any equations so that I can do the math myself. Hence, here is my question...

Homework Statement You are dragging a 110 kg trunk across a floor at a constant velocity with a horizontal force of 380N. a) Calculate the coefficient of kinetic friction b)A friend decides to help by pulling on the truck with a force of 150N [up]. Will this help? Calculate the force...

Homework Statement In 1654 Otto von Guericke, inventor of the air pump, gave a demonstration before the noblemen of the Holy Roman Empire in which two teams of eight horses could not pull apart two evacuated brass hemispheres. (a) Assuming the hemispheres have (strong) thin walls, so that...

When do you pull the plug on a "friend?" So, how many times to you let a friend harpoon you, disregard your requests to not call after midnight, call you names and belittle you, have your POA and not call for a week and a half, never phones you when I drove her to Cleveland, Pittsburgh and...

Homework Statement Hi all, greetings from aus! having mad trouble with this question: so I've figured out that the friction limit for block B is 11.35N when it is stationary. Putting my co-ords parrallel to the 15 degree incline means the force due to gravity in the x direction is...

We have ~78 underground pull boxes (12ft by 12ft) scattered around our 700m by 1500m yard that are passing 12kV cables through underground ductwork.(i.e. pipes) See figure attached for detailed drawing of layout including pull boxes, station service transformers and control buildings...

Homework Statement What value(s) of θ will result in the block being accelerated 9.0m/s2 to the right? Homework Equations ƩFx = max N = mg - P sin(θ) The Attempt at a Solution P cos(θ) - μkN = max P cos(θ) - μk(mg - P sin(θ)) = max P cos(θ) + μk P sin(θ) = max + μkmg cos(θ) +...

I'd want the rest of me to stay alive. Sure it's a lousy way to live but it beats being all-the-way dead. Maybe if I make it 20 years they'll figure out how to fix dead brains and revive me.

I have built a new electromagnet, my second one so far, in an attempt to make it better. I am trying to find its strength, whether that be in tesla, holding force (kg) or whatever other units there are, just so I can compare it with other magnets. What I have is a steel bolt wrapped with...

A train applies steel wheels to a steel track. Therefore, without any distortion of the wheel or track, the contact patch would be extremely small. Now, if you slice a chord from the wheel, creating a flat spot contacting the track, the result is a larger contact patch. With a larger...

Homework Statement Hi, this is not homework or course work, I am a layman and I am just trying to understand an article I have regarding drawbar pull, in particular the pull coefficient (dimensionless) P/W where P is described as "pull (drawbar pull), lb" and W is described as "wheel load...

In the following "semi" table, is a group of magnets, all seem to have the same Surface field but all different pull force(attraction/repulsive force at maximum with gap = 0). How is it possibile to have the same S.field rate but different forces? Is it due to the size of each magnet...

http://i.imgur.com/TbYIHnb.png?1 So, if I have a pull up and apply a current source. How would I need to read/calculate resistance? V=IR I = 5V/8k = .0006A would result in a voltage drop of close to 5V Using a current source/Voltage reader I supply .0006A which should equate to ~5V...

Dear physics forum, I'm currently working on a project and wondering what should the air temperature difference be to create a strong pulling force ? I'm working on creating a sustainable house, the concept is to have a enclosed glass roof with an opening that allows the sun to heat the air...

I was wondering if a gravitic field has a limit, where after a certain distance, determined by the properties of the structure creating the gravity field, the force felt by the 1kg masses becomes 0N. For example, will two 1 kg masses, separated by an arbitrarily super large value (I.E. 50...

Homework Statement My physics teacher today said that the Earth exerts the same amount of gravitational pull on sun;as the sun exerts on the earth. Is this really true? Homework Equations There is no equation. The Attempt at a Solution I am very confused with this. How can the...

Homework Statement A chain of mass 4Kg and length 2m is lying on a table, such that 60 cm of one end is hanging from one edge off the table. Find the work done to pull the entire chain on the table. Homework Equations (anything that'll work i suppose) The Attempt at a Solution I...

HI guys, I am trying to build a pulley with a gear box. So I want my pulley, which is operate by a 3V DC motor with max speed of 8300 RPM. I think the size of the output shaft is 3mm Ok, so Can someone help me with how to calculate the original amount of torque I can get out of this...

How far from Uranus must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances Uranus's pull? Fg=Gm1m2/r^2 Would m1 be the sun's mass and m2, Uranus' mass. then what would Fg be?

Hi, I'm trying to find the belt pull on a mower deck. The deck consist of 3 spindles and a spring loaded back idler with one v-belt. The engine driving the spindles is a 20 HP twin cylinder engine operating at 3600RPM. Main drive spindle is 3600 rpm (1:1 ratio) Engine manual says max...

Let me ask a strange question. is it posible to atract the gravitational pull of an object in space and some how use it to accelerate your spaceship thrue space. Like reach out to Jupiter and lock in on its gravity and magnefie it for acceleration.

Homework Statement Find the number of kilograms needed to pull apart evacuated Magdeburg Hemispheres whose radii are 25.0 cm when the barometer reads 760mm of Hg. I really don't know where to start. Could someone walk me through it? Homework Equations Unknown. The Attempt at a...

To pull a wagon we need a force of 300 N. How much work is done if we pull the wagon 8 km?? And how much is the effect if the wagon is being pulled for 40 min.?? And if we pull the wagon for 40 min. and the effect is 5kw, how far can we pull the wagon?

Homework Statement You are dragging a 110 kg trunk across a floor at a constant velocity with horizontal force of 380 N. A friend decides to help by pulling on the trunk with a force of 150 N [up]. Will this help? Calculate the force required to pull the trunk at a constant velocity to help...

Homework Statement A small box of mass 1 is sitting on a board of mass 2 and length L . The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is Us . The coefficient of kinetic friction between the board and the box is, as usual...

Homework Statement A rocket on its way to the moon passes through point P (along the line connecting the Earth and the moon) where the gravitational pull by the moon is exactly equal to the gravitational pull by the earth. Neglect the motions of the moon and the Earth and find the...

Hi. I'm totally new to this forum because I am not seeing what I would refer to as 'logic' on wiki. I'll make this one easy for someone! Can anyone direct me to a website which might clearly explain the following statement: "The Sun's gravitational pull on the Moon is over twice as great as...

Homework Statement Straight out of the book: "An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1100N. The coefficient of static friction between the box and the floor is 0.35. (a) What should be the angle between...

In any signal line that's oscillating, how does the pull up resistor value affect the signal frequency. According to I2C specs, The pullup res and the device capacitance limit the rise time of the signal, thus limiting the max frequency. But when I simulated, I didn't see any change in...

Coverting Amp to pull force?? I am trying to figure out a way to covert amps to pull force(lbs). I have a known amp that I would like to find out the pull force in lbs. I have 2.8 amp @ 120v and would like to know the pull force that is needed to turn this type of amperage.

Homework Statement The mass of the moon is 7.35x10^22 kg. At some point between Earth and the Moon, the force of Earth's gravitational attraction on an object is canceled by the Moon's force of gravitational attraction. If the distance between the Earth and the moon (center to center) is...