Pull Definition and 312 Threads

  1. I

    How does the moon pull on the earth?

    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...
  2. N

    Three girls pull a sled. Determine the acceleration.

    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.
  3. N

    Calculate Magnetic Pull Force for Steel Ball

    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...
  4. D

    Calculating Push & Pull Forces | Andre's Physics Questions

    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...
  5. D

    Electromagnet pull force calculation:

    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...
  6. E

    Calculating Bollard Pull: From N/KN to Tonnes

    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
  7. S

    Torque required to pull a 737-800

    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)
  8. B

    About the energy necessary to pull out the closest electron of a atom

    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@
  9. M

    How to Weaken Magnetic Pull Between Magnets for Easy Separation?

    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...
  10. R

    Gravitational pull on an object

    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...
  11. N

    Height at which pilot must pull out of dive before hitting 5g

    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...
  12. T

    Which Law Determines the Strength of a Pull?

    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...
  13. K

    Electric Charge/Gravitational Pull

    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...
  14. T

    Calculating Acceleration of a Sled on an Incline with a Pulling Dog

    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...
  15. Y

    Rotational speed due to gravitational pull in earth's orbits

    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...
  16. S

    A bullet falling to earth and g being the only pull

    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...
  17. O

    Calculate the force required to pull the truck

    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...
  18. F

    Force to pull appart hemiphere under vacuum.

    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...
  19. L

    When do you pull the plug on a friend?

    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...
  20. S

    Friction On 2 Blocks + Angled Pull

    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...
  21. jegues

    120V AC Supply to Pull Boxes in station yard (Design Problem)

    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...
  22. C

    Block pull, Problems with trig to isolate for theta.

    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) +...
  23. J

    If you became brain-dead, would you want them to pull the plug?

    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.
  24. P

    Finding strength, pull, telsa (anything) of an electromagnet

    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...
  25. S

    Would it be easier to pull a train with flat wheels?

    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...
  26. P

    Surface field vs pull force(attraction force) of multiple magnets?

    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...
  27. E

    Is My Pull Up Resistor Calculation Correct?

    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...
  28. C

    Temperature differences to create a strong pull

    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...
  29. S

    Gravitational Pull Limit Across Distance?

    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...
  30. A

    How does the earth exert gravitational pull on the sun

    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...
  31. deep838

    Work done to pull the entire chain

    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...
  32. Q

    How do you calculate the amount of torque you need to pull an object?

    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...
  33. J

    Solving for gravitational pull

    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?
  34. M

    Possibilities of Gravitational Pull in Space Travel

    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.
  35. S

    The number of kg needed to pull apart Magdeburg Hemispheres

    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...
  36. C

    To pull a wagon we need a force of 300 N. How much work is done if we

    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?
  37. A

    Force required to pull trunk across floor

    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...
  38. T

    Finding Constant Force to Pull Board from Mass 1 Box

    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...
  39. P

    Gravitational pull on a spaceship by Earth = that of the Moon

    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...
  40. A

    Gravitational Pull: Sun vs. Earth's on Moon

    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...
  41. E

    How to find the angle that will pull the most weight

    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...
  42. L

    Pull Up Resistor Value Impact on I2C Signal Frequency

    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...
  43. M

    How do I convert amps to pull force for an electric motor?

    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.
  44. A

    Gravitational pull with the earth and moon

    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...
  45. R

    I am trying to figure out how much force i need to pull to drag an

    I am trying to figure out how much force i need to pull to drag an object with a given surface 1634 square inch and weight from a given depth. Between 100 - 200 m 11-21kg psi. However I do not know how to use Newtons laws correctly in this senario. The object does not the to accelerate. Can you...
  46. B

    Dinosaurs may have experienced less gravitational pull as a result 21.9hour day

    There are a number of factors involved in weight experienced by a particular mass on the surface of the earth. There is of course the Mass of the Earth itself, the variable distribution of heavier elements in the Earth itself, the motion of the ocean mass due to tides etc, the motion of the...
  47. N

    Vacuum Chamber: How Long Will It Maintain Pressure?

    The syringe' plunger is in a fully retracted position (non-vacuum state) and is then connected to the tube forming an airtight seal. Then the valve to the vacuum chamber, having 29.9 Hg of vacuum, is opened. I am fairly, certain that the plunger in the syringe will move to its forward most...
  48. M

    How to calculate the magnetic field and pull force generated by current?

    Hallo all, I've been looking around to find the best way to calculate the magnetic field generated by current flowing through copper wire... There were many sites I've found but its kinda confusing One of the laws: I thought it was simple to determine the magnetic field... Is there...
  49. N

    Calculating Force Needed to Pull Plunger in Standard Syringe

    I have a standard syringe 1” diameter, with a freely moving plunger requiring uniform force to move the length of the cylinder providing smooth uniform travel. Cross sectional area = ∏r2 = 3.1415 * 0.5” * 0.5” = 0.785 in2 Negative pressure acting on the piston = 0.758 in2 * 14.7 psi =...
  50. I

    Magnetic pull force with a gap

    Hello. I'm a cabinetmaker and my college physics courses are 25 years behind me now. I'd consider it a kindness if someone would answer a question for me regarding magnetism. I have a magnetic strip that is described as having 6.2 lb. of magnetic pull force per lineal foot, 1" wide and 0.020"...
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