What is Pull: Definition and 326 Discussions

Homework Statement Two identical blocks of mass m are attached via a massless spring of spring constant k. The length of the spring in equilibrium is l. The system moves on a frictionless horizontal plane. With one block resting against a wall, the two blocks are pushed to- gether, so...

Homework Statement A constant horizontal pull acts on a sled on a horizontal frictionless ice pond. The sled starts from rest. When the pull acts over a distance x, the sled acquires a speed v and a kinetic energy K. If the same pull instead acts over twice this distance, <the sled's speed will...

When a neutron star flucuates into a black hole does the gravity increase tenfold? Or does the neutron star gravity (while turning into a black hole) increase as expected with the addition of more mass?

Homework Statement A man is strapped to a chair which is connected to a pulley (combined weight of chair and person = 95 kilograms). With what magnitude must the man pull on the rope if he is to rise a) with a constant velocity b) with an upwards velocity of 1.3 meters per seconds...

Hi, I am trying to program an I2C interface and it's not working. The master is TI Cortex M3 processor and slave is ST Compass. I have captured the scope pictures and found that slave is not bringing the data line all the way to ground and this is violating I2C spec. I have sent the scope...

Let's say a magnet is attached to an object that weigh's 15 pound's . Then someone attempt's to take the magnet off the object . The object then go's up with the magnet (still being attached to it ) Does that mean the magnet can lift 15 pound's ? Also when a magnet is rotateing through a coil...

1. Homework Statement A plastic shade cover is almost 290 ft in length and 150 ft in breadth. It is wrapped around a cylindrical wooden rod which is at a height of 7 ft from the ground. The cover is pulled by nylon/plastic ropes to the right to its complete length of 290 ft. Consider the...

I would like to know views on the force required to pull a cylindrical cover. A plastic shade cover is almost 290 ft in length and 150 ft in breadth. It is wrapped around a cylindrical wooden rod which is at a height of 7 ft from the ground. The cover is pulled by plastic ropes to the right to...

Hello everyone. I have been trying to determine the tensile force needed to rip a threaded tube out of its female threaded socket. After some Google searching, I found this: http://www.engineersedge.com/thread_strength/thread_bolt_stress.htm I used shear area, which I believed to be an...

Homework Statement The yo-yo is made of two wheels, connected by a short beam (the cross-section of the beam looks like the letter "H"), around which wire is wrapped up. Let the yo-yo be stationary on a desk. What is the angle ß in relation to the said desk (see picture) that we must gently...

My professor recently tasked me with first understanding maxwell's stress tensor and then applying it to analyze the force produced by a linear pull type solenoid. However after having studied the stress tensor I am not sure that I can apply the stress tensor to a solenoid. I don't believe...

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.

Homework Statement What would be the necessary magnetic field strength needed to pick up a 0.1543 lb. magnetic object 0.238 meters away? (I am trying to find a permanent magnet, not an electromagnet to accomplish this) (the pull force of the permanent magnet I am using is 4.7 lb)Homework...

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.