Pull Definition and 312 Threads

I was inquiring about how much force will a 1000 lb pull force electromagnet pull at 4-6 inches away from the magnet

You need to move a 500 N box across the floor. You pull on the box with a rope which is also horizontal. The floor is not frictionless. You move the box so that it moves with a constant v of 3m/s by applying a 200 N force. Coefficient of Friction? Also, same question except pull the...

Homework Statement Determine the velocity of the 100kg crate being pulled horizontally by a rope connected to a motor in 15s if the motor operates with an efficiency of e = 0.8. The power input of the motor is 2Kw. The coefficient of kinetic friction between the crate and the plane is 0.2...

Many of you have done this in your past. Two magnets, one under a table, another on top of the table, and moving the one under will cause the one on top to move. Is there a material that, given the same thickness, will block this magnetic pull/repelling between the two magnets? Thanks.

hello, new to these forums, and i have a question about gravitational pull of two objects i'm trying to make a game based off of gravity's pull on objects, and have been reading through articles on gravity, i decided to go with Newton's law of universal gravatation for calculating the force...

Hello; We know that waves of the sea are caused by the gravitational pull of the moon. But if this is true, why doesn't this happen with lakes or cups of water? What about things like molecules in the air? Thanks.

If I have 2 objects with equivalent mass. Is there anyway I can make one of them have a stronger pull by changing the density? If so are there any equations the help me predict to what extent? Thanks.

Hi All, I was browsing the internet and came across this forum, I was thinking to myself one day and decided to do a google search. My question is basically, how do I determine how much weight a bolt can take before it pulls out of the thread. For example, I want to attach Part A to Part B with...

I'm trying to figure out the currubt gain for a class ab push pull amp. I know that it's basically two emitter followers, so am I correct in assuming that the current gain is just Beta?

Hello, I need help calculating the (Initial and sustained) Force required to pull a round pin that is under load. I have attached a dim diagram showing the system. Please assume no friction since I haven't selected the materials. Also if you could help me calculate the Sheer force (again...

Homework Statement at a moment of total eclipse the moon lies in a straight line from the Earth to the sun. If your normal weight is 600N how much is your weight decreased by the combined pull of the sun and moon? [b]2. Homework Equations Mass of sun - 2.0x10^30 kg distance from...

Okay i am new to this site so i figured this would be the best place to post this. I need an equation for my project i am working on. I need an equation to find the speed of a object based off how much force is applied to it. If this isn't clear enough i am welcome to give more...

Hi, will I damage the IC (it is 74LS07) if I select a pullup giving 20 mA of current trough the open collector (without any other load)? I looked at the datasheet but I can't figure which parameter should I be looking at (because they give HIGH-level output current of 250 micro amps. What I...

Nano magnetite particles are found in the brain. They are associated with schizophrenia, parkinson's disease, aging and etc. Imagine that we are able to make a huge NMR machine and place a live human being in the bore to cause levitation. The diamagnetic particles will orient against the...

Hello all. I am a newcomer on the forum and no major math or astronomy knower. But I have often thought about this issue I would like to ask about here. From what I understand the Big Bang happened from a singularity expanding outwards (or exploding). As the speed of light is considered a...

I calculated, using Newton's formula F = GmM/r^2, that the gravitational attraction between two large, full oil tankers whose sides are touching would be 1,331 lb., given the mass of each ship as 6.5 x 10^8 kg, distance between their CG's of 69 m, G = 6.674 x 10^-11 N(m/kg)^2, and 1 N = 0.2248...

Tricky Question --> gravitational pull problem Homework Statement NASA sends up a satellite that just escapes Earth's gravitational pull. If the satellite is sent to Jupiter (Mass = 2*10^7kg Radius = 70,000km) how much energy must be released by the satellite such that it will...

You have a toy car on a table and a single pulley on the end. You tie a string to the car, and the other end to some 20 gram weights next put the string on the single pulley. The force causing the car to accelerate when you let it go is it Fp or Ft (pull force or tension)

Homework Statement Calculate the force needed to pull a mass of 20 kg at a uniform slow speed up a plane inclined at an angle of 30 with the horizontal if the coefficient of kinetic friction is 0.20. Homework Equations WN= w cos \vartheta WT= w sin \vartheta \mus= tan\vartheta The...

Homework Statement Daniel's weight is 800 Newtons. According to Newton's Third Law, if the Earth pulls on Daniel with a force of 800 Newtons, then Daniel pulls on Earth with a force of 800 Newtons in the opposite direction. Why then is Daniel able to trip and fall down to the ground...

Magnetic "Push" and "Pull" To make the question simple to understand, if I took two standard bar magnets, and placed them approx. 4 cm from each other with a north pole facing south, and then placed them the same distance from each other but with a south pole facing south, would the attractive...

Homework Statement A spaceship is launched and starts moving directly towards the Moon. At what distance from the Earth will the pull of the Moon on the spaceship exceed the pull of the Earth? Ignore the effect of the Sun in this calculation. Homework Equations F = Gm1m2/r2 F = ma...

thanks

I found interesting to me this topic and tryed to analyze. http://img505.imageshack.us/img505/6655/49209931.jpg At which angle it is eseaiest to pull an object? I got equation F=\frac{\mu mg}{cos(\alpha)(\mu tan(\alpha)-1)} or F=\frac{\mu mg}{\mu sin(\alpha)+cos(\alpha)} I don't know...

First, I'm not a physicist. But I do think of the subject often. A simple observation, as you move away from Earth the gravitational pull decreases. OK let's say we can drill a hole through the center of the Earth what is the gravitational pull as we reach the middle? Is your answer fact...

My question is quite simple Imagine a massive object speed by you. We know that everything including gravity abides the law that nothing can travel faster than light. Therefore it will take a little bit of time for the objects gravity to reach you, but in the time spent for the gravity to...

Homework Statement Planet Z is 13700 km in diameter. The free-fall acceleration on Planet Z is 8.79 m/s2. What is the mass of Planet Z? Homework Equations Gm1m2/r2 The Attempt at a Solution I am not sure how this problem is suppose to be worked at all, any of these kind I am...

Homework Statement Two spheres of mass m and a third sphere of mass M form an equilateral triangle, and a fourth sphere of mass m4 is at the center of the triangle. The net gravitational force on that central sphere from the three other spheres is zero. (a) What is M in terms of m? (b) If we...

Hey there, firstly i'll just say to start I've not studied general relativity at all, and the answer to my question may lie there, but i'll ask anyway; Well I was thinking about the gravitational equation; F (1,2) = m1m2G/d² However putting the Earth & a person in there gives an absolutely...

If gravity is generated inside the sun by the mass of the sun, how does it initially get away from the sun out to the edges of our solar system(or the edge of the universe) so that it can pull everything back to the sun? I've heard the analogy about how it's like a funnel filled with sand and...

If three balls (all weighing 2.0kg) are lined in a row, what is the magnitude of the net gravitational force on mass A due to masses B and C in the figure. B is 10cm from A, and C is 50 cm from A (and of course C is 40 cm from B) (here's a 'diagram') (A)----(B)----------------------------C...

Homework Statement A spaceship is launched and starts moving directly towards the Moon. At what distance from the Earth will the pull of the Moon, on the spaceship, excced the pull of the Earth? Ignore the effect of the sun in this calculation. Homework Equations F=G(M1M2/r^2) The...

Moon --> Earth (Gravitational Pull... help please any comment welcome! Homework Statement At what distance (AU) does a spacecraft leaving the gravity of the Earth traveling toward the moon balance the gravity of the moon? I.E. What distance in (AU) will the object begin being affected by...

Homework Statement How many GE locomotives are needed to power a 15k tonne (note tonne not ton) train up a 1 degree grade. Ignore rolling friction and wind resistance. Locomotive traction power is 4400 HP/locomotive. Homework Equations 1 hp = 745.7 J/s * 4400 hp = 3281080 J/s and...

Homework Statement I have a problem. Imagine there is a ball on a carpet, I start to pull the carpet. The mass of the ball is 7 kilograms and the acceleration of the whole thing is 2m/s^2. What is the force with which I am pulling the carpet. Also what is the acceleration of the center of...

Hi, doesn't the gravity of a black hole remain relatively the same? It should because gravitational attraction depends on mass, which stays the same. And if it does, is it posible for a planet to orbit the BH.? (without light, of course)

I am a historian[ PhD] who specializes in the History of Science and consequently reads a great deal of physics. Since my childhood I have been fascinated by space travel and have always read that the escape velocity from the Earth's gravational field is 25000 mph. I recently read a book in...

I just needed to know for my work-in-progress hovershoes.

What is the work done by the two forces together in moving an object a distance of d = 14 m as shown in the diagram? The magnitude of each force is 7 N.

Homework Statement A block with eight of 455 N is being pulled at constant velocity by a force directed at 30 degrees above the horizontal. The friction force on the crate is 1163 N. What is the magnitude of the pulling force? Homework Equations Ft= kx Fnet= ma The Attempt at a...

I need to caculate the Pull in LBS of Electromagnets, i am missing some information regarding this & maybe some brain cells also. B (Flux Density)= Flux Lines/ Area Pull in LBS= B x A / 72,000,000 Ok, how do i get B Flux Density in lines per sq/inch for the calculation. I guess it...

*despite the current economic situation* im trying my hardest to transfer out in a year. definitely OUT of state, i reside in new jersey. i need a car and I am quite dead set on a certain one. to be specific, a jazz blue 20th anniversary VW gti. but, the problem is the fact that i simply...

Suppose you had a very, very large black hole, so large that the tidal forces at or near the event horizon were not fatal. If you lowered someone down via a very long indestructible cable past the event horizon, and you held your spaceship sufficiently far away from the black hole to ignore its...

Beverage engineering. The pull tab was a major advance in the engineering design of beverage containers. The tab pivots on a central bolt in the can's top. When you pull upward on one end of the tab, the other end presses downward on a portion of the can's top that has been scored. If you pull...

There are two objects with the distance of r apart . because of the gravity , these two objects start to get closer to each other and then they get to each other (actually they fall on each other) .So my question is how long does it take for them to get to each other? Thank you

Newton’s Third Law. “To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always directed to contrary parts. “Whatever draws or presses another is as much drawn or pressed by that other. If you press a stone with your finger, the...

An infinitesimally thin rope is held on a frictionless table with one-fourth of its length hanging over the edge. If the rope has length L and total mass m (assuming uniform mass distribution), how much work is required to pull the hanging part back onto the table. U = mgh The length of...

Homework Statement A skier of mass 69.5 kg is pulled up a slope by a motor-driven cable. a) How much work is required to pull him a distance of 59.1 m up a 30.1° slope (assumed frictionless) at a constant speed of 2.07 m/s? The Attempt at a Solution I started out this problem by finding...

This is incredibly ignorant (and worse, the result of a drunken conversation), so I apologize in advance, but: If you worked out the mass of an average human being, and suspended them in space at the average distance of the Earth to the Sun (but subtracting the existence of the Earth and...

Homework Statement A uniform cable hanging over the edge of a tall building is 40 ft long and weighs 60 lb. How much work is required to pull 10 ft of the cable to the top? Homework Equations Density=3/2 ft/lb The Attempt at a Solution Ok, the problem is this: I can solve this...