What is Pully: Definition and 51 Discussions

Pully (French pronunciation: [pyˈji]) is a municipality in Switzerland in the canton of Vaud, located in the district of Lavaux-Oron. It is one of the eastern suburbs of the city of Lausanne, located on the shores of Lake Geneva (Lac Léman) and at the foot of the vineyards of Lavaux on the road to Vevey and Montreux.

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  1. Rubberduck2005

    A slightly complex pully problem missing the final step

    so I have already done most the work in finding the following things M1A1=M1g-T1, M2A2=M2g-T2 T2=2T1 M2A2=M2g-T2 and then through further working out(use of the invariance of length of L1 and L2 the strings attached to M1 and M2 then finding A1=-2A2) A1=2g(2M1-M2)/(4M1+M2) and...
  2. I

    Difficulty with this Problem involving a Pully and Cart

    My attempt is also attached. Basically, I think I have (a) down. The only issue is I am getting the wrong answer, and I was hoping one of you could let me know if the answer key is wrong or the way I did it was wrong? The answer is 1.823m/s^2. Also, for the second part, I am really not sure...
  3. Alex Katko

    Calculate the natural circular frequency ωn of the system

    Homework Statement Calculate the natural circular frequency ωn of the system shown in the figure. The mass and friction of the pulleys are negligible. The diagram is attached. Homework Equations ωn = (k/m)1/2 The Attempt at a Solution I can see the total mass of the system is 3m. So in the...
  4. Y

    Pully System on an Inclined Plane: Understanding Direction of Acceleration

    Homework Statement [/B] So I am pretty okay with most of this problem. And I asked my teacher for clarification but he just sort of said "because it's positive" and I get that's it's positive. Apparently "everyone's" struggling with that, and therefore we are going over this problem to...
  5. J

    Two Blocks and a Pulley Friction Problem

    Homework Statement System comprised blocks, a light frictionless pulley and connecting ropes (see diagram). The 9.0kg block is on a perfectly smooth horizontal table. The surfaces of the 12kg block are rough, with μk = .2 between the two blocks. If the 5.0 kg block accelerates downward when it...
  6. J

    How Does a Speck of Dust Affect the Motion of a Box on an Inclined Ramp?

    Homework Statement 100 kg box is held in place on a ramp that rises at 30° above the horizontal. There is a massless rope joint to the box that makes a 22° angle above the surface of the ramp. Coefficients of friction between the box and the surface of the ramp are μk = 0.40 and μs = .60. The...
  7. I

    Mass Relation in a Three-Mass Pulley System: Solving for Unknown Masses

    Homework Statement Find the relation between the mass of block 1 and the mass of block 2. Assume that the pullies are massless and frictionless and that the rope is inelastic. All masses are unknown. Possible answers: mblock2 = mblock1[/B] mblock2 > mblock1...
  8. C

    Dynamics of a Box attached to a pully

    Homework Statement Body A in Fig. 6-33 weighs 102 N, and body B weighs 32 N. The coefficients of friction between A and the incline are μs 0.56 and μk 0.25. Angle θ is 40. Let the positive direction of an x-axis be up the incline. In unit-vector notation, what is the acceleration of A if A is...
  9. J-dizzal

    Static force equilibrium problem involving simply pully syst

    Homework Statement A former student of mechanics wishes to weigh himself but has access only to a scale A with capacity limited to 120 lbs and a small 20-lb spring dynamometer B. With the rig shown he discovers that when he exerts a pull on the rope so that B registers 19 lb, the scale A reads...
  10. A

    How Do You Calculate Tension and Acceleration in a Constrained Pulley System?

    Homework Statement A,B,C are of mass one kg each, while D,E are massless pulleys. https://docs.google.com/file/d/0B0FIIKckKOcKN2JxcS1DYldaX0U/edit?usp=docslist_api We need to find Tension in string, acceleration of A,B,C Homework Equations T-mg=ma The Attempt at a Solution I tried getting...
  11. Wayland Bugg

    Rope tangent angle over pully given position of offset load

    I am trying to symbolically resolve the angle of rope that suspends a load (rectangle) between two pulleys given the length of rope that is let out over the pulleys. See attached image. the load is not intended to move horizontally, only vertically. so you can imagine each pulley must have an...
  12. P

    What is the Tension in a Two Pulley System?

    Homework Statement Two masses hang by a pulley system shown in the attachment. The masses both weigh the same. Find the tension on the rope. The first attachment is straight from the book, the second attachment is me redrawing it with labels along with a free body diagram of each mass...
  13. B

    How Does Tension in a Frictionless Pulley System Behave with Balanced Forces?

    1. A 2.0 kg mass sits on a frictionless horizontal surface. The mass is attached by a weightless string running over a frictionless pulley attached to a 1.5 kg mass. An additional string exerts a force on the block on the mass on the surface so that no motion results. Find the tension in each...
  14. C

    Rotational Dynamics in a Pully

    Homework Statement An green hoop with mass mh = 2.6 kg and radius Rh = 0.12 m hangs from a string that goes over a blue solid disk pulley with mass md = 2.3 kg and radius Rd = 0.09 m. The other end of the string is attached to a massless axel through the center of an orange sphere on a flat...
  15. C

    Frictionless pully acceleration

    Homework Statement M1 is on a frictionless flat horizontal surface. It is attached to M2 by a string, which hangs freely from the string which passes over a frictionless pulley of negligible mass. Find a general expression for the acceleration of both M1 and M2. Look at your result and...
  16. L

    Solving Inclined Pully Table: Acceleration & Tension

    Homework Statement block1 2kg block2 2.5kg coefficient of static friction =.5 coefficient of kinetic friction= .3A)how can you find the acceleration and tension? which coefficient do you use?
  17. L

    Why won't my equation work for this pully system?

    Homework Statement Two objects, of masses m1 = 485.0 g and m2 = 494.7 g, are connected by a string of negligible mass that passes over a pulley with frictionless bearings. The pulley is a uniform 53.0-g disk with a radius of 4.08 cm. The string does not slip on the pulley. Find the...
  18. M

    Solving Pulley System Questions: Tensions, Weights, and F=ma

    In the figure below, M2 has more mass than M1 and M1 has more mass than M3. The questions refer to the magnitudes of tensions and weights. There is friction between the horizontal plane and M2 (mu_k not equal to 0). M2 is observed to travel at a constant speed. Assume that the pulleys are...
  19. C

    Increased acceleration in a pully system

    Homework Statement A window washer pulls themself upward using a bucket/single pulley system. Their weight with the bucket is 65 Kg. a) How hard must she pull doward to raise herself slowly at a constant speed? b) If they increase the force by 15% what will her accelertion be? Homework...
  20. U

    Inertia of pully system with wire that has a mass

    Homework Statement A pully system with a hanging mass is connected to a winch. The goal is to find acceleration of the mass for a given motor torque. The pully sheaves is considered with no friction, but has a given inertia. I have found the inertia of the winch, but I have trouble calculating...
  21. A

    Pully with 2 blocks friction question

    Homework Statement Two blocks are connected by a string that goes over an ideal pulley as shown in the figure and pulls on block A parallel to the surface of the plane. Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0° to the horizontal. The coefficient of static...
  22. J

    What is the correct way to find tension in a pulley problem?

    Okay So, the question I have here is.. Masses are connected as shown. m1 = 5.0 kg and m2 = 4.0 kg. a) find the acceleration of each object and b) the tension in the two strings I have attached the picture example as well (as there is another unlisted weight in it) With pulley problem's I...
  23. I

    Calculating Time for Object to Hit the Floor in a Pulley System

    Hi guys, I have this question below but I don't have the answer to it and I'm not sure if what I am doing is right. I attempted the solution by balancing the forces as I am not as clear on how to use the energy method yet. Is my solution/answer correct? (: Thanks guys!Homework Statement...
  24. H

    Mass and cylinder connected by a pully system

    Homework Statement A solid cylinder of weight 50 lb (mass=2.3 kg) and radius 3.0 in (7.6 cm) has a light thin tape wound around it. The tape passes over a light, smoother fixed pulley to a 10-lb (mass=4.5 kg) body, hanging vertically. If the plane on which the cylinder moves is inclined 30...
  25. J

    Calculating Maximum Height of a Hanging Block on a Pulley System

    two blocks (2.2kg and 3.2kg) both hanging 1.80 m from the ground on a pulley(massless / frictionless) that is 4.80 m from the ground. What is the maximum height the smaller block (2.2kg) reaches, when the system is released? It appears that I need to find its velocity first of the system...
  26. A

    Frictionless pully and incline

    Figure 5-56 shows a box of mass m2 = 1.3 kg on a frictionless plane inclined at angle θ = 34°. It is connected by a cord of negligible mass to a box of mass m1 = 2.7 kg on a horizontal frictionless surface. The pulley is frictionless and massless. (a) If the magnitude of the horizontal force F...
  27. D

    2 objects with pully. need distance

    2 objects with pully. need distance! Homework Statement The two masses shown in the figure are each initially 1.80 above the ground, and the massless frictionless pulley is 4.8 above the ground. What maximum height does the lighter object reach after the system is released? [Hint: First...
  28. C

    2 hanging masses on Pully with friction time to reach floor?

    Homework Statement http://session.masteringphysics.com/problemAsset/1070551/3/12.P70.jpg The two blocks in the figure are connected by a massless rope that passes over a pulley. The pulley is 15 cm in diameter and has a mass of 2.6 kg. As the pulley turns, friction at the axle exerts a...
  29. J

    How Do You Solve a Physics Problem Involving Two Masses and a Pulley?

    Homework Statement An unknown mass, m1, hangs from a massless string and descends with an acceleration g/2. The other end is attached to a mass m2 which slides on a frictionless horizontal table. The string goes over a uniform cylinder of mass m2/2 and radius R. The cylinder rotates about...
  30. M

    2 weights on a pully, show formula

    Homework Statement The apparatus (see link to image) is used to measure the free fall acceleration g by measuring the acceleration of the two blocks connected by a string over a pulley. Asume a massless, frictionless pulley and a massless string...
  31. S

    Torque applied pully with mass

    An Atwood's machine consists of blocks of masses m1 = 8.4 kg and m2 = 20.7 kg attached by a cord running over a pulley as in the figure below. The pulley is a solid cylinder with mass M = 7.40 kg and radius r = 0.200 m. The block of mass m2 is allowed to drop, and the cord turns the pulley...
  32. T

    ATTWOOD'S MACHINE (rope + pully)

    Homework Statement Determine the force of gravity acting on the masses (we want to end up with 9.8m/s2---> My situation : A rope with 2 different masses hanging on each side, is held by a pulley. The heavier mass falls towards one end. (teacher said something about the mass having to cancel out...
  33. S

    Why Increasing Pully B's Diameter is Incorrect

    http://dl.getdropbox.com/u/119319/pully-1.jpg the book says the answer is C because 'increasing the diameter of the pully decreases the amount of force required to pull rope A'. I don't understand why increasing the diameter of pully B does not have the same effect (i.e., why D is incorrect.)
  34. S

    Uniform Pully with a single block, do not understand where mass relates?

    OK, my largest issue with dealing with uniform cylindrical pulleys and a single block (object) is understanding where mass of the block relates in any of the equations. Specifically, I was doing some problems earlier with no issues at all. Then I came across one asking about the mass of the...
  35. L

    Find Tension in String: Friction & Pulley

    An 8.0-kg hanging block is connected by a string over a pulley to a 6.5-kg block sliding on a flat table. If the coefficient of sliding friction is 0.28, find the tension in the string. is the answer 41.02 N ?
  36. J

    Solve Force and Tension for Masses in Inclined Plane System | Newton's Laws

    Homework Statement The figure (attached (5-56))shows a box of mass m2 = 2.60 kg on a frictionless plane inclined at angle θ = 33°. It is connected by a cord of negligible mass to a box of mass m1 = 4.00 kg on a horizontal frictionless surface. The pulley is frictionless and massless. (a)...
  37. R

    Two Masses, a Pully, and an Inclinde Plane

    Homework Statement Block 1, of mass m1 = 0.700kg , is connected over an ideal (massless and frictionless) pulley to block 2, of mass m2. Assume that the blocks accelerate downword with an acceleration of magnitude = 0.250m/s^2 and that the coefficient of kinetic friction between block 2...
  38. R

    Rotational acceleration Pully

    Homework Statement Two objects are attached to ropes that are attached to wheels on a common axle as shown below. The two wheels are glued together so that they form a single object. The total moment of inertia of the object is 41 kg·m2. The radii of the wheels are R1 = 1 m and R2 = 0.4 m. (a)...
  39. B

    Force Analysis of a Pulley System with Inclined Plane and Hanging Masses

    A block of mass m1 = 4.00 kg on a frictionless inclined plane of angle 30.0° is connected by a cord over a massless, frictionless pulley to a second block of mass m2 = 2.40 kg hanging vertically (Fig. 5-41). Figure 5-41 (a) What is the magnitude of the acceleration of each block...
  40. M

    What is the acceleration and tension in a pulley system?

    Homework Statement Apply Newton's second law to find formulas for the magnitude of the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord. (Use only the following: m_1 for m1, m_2 for m2, and g for gravity.) a = ? T = ...
  41. D

    Atwood machine pully problem with a twist

    Homework Statement A simple pulley has two masses on either end, one M1 and one M2. It is easy to find the acceleration of the two masses, and the tension on the rope suspending these masses. The pulley is suspended by a cord, however, and the question asks to find the tension in this cord...
  42. J

    Solving 2 Weights on a Pulley Problem

    1. A 3kg weight is attached to a 2kg weight by a rope. This rope is placed over a pully so the weights are hanging. The 2kg weight starts 4 meters lower than the 3kg weight. If the system starts at rest what is the speed of the objects when they are at the same height. 2. Fnet = ma...
  43. N

    Force on 70kg Person Holding Rope onto Pully

    If a person of mass 70 kg is holding onto a rope that is connected to a pully and is suspending a person of mass 60 kg on the other side, what are the forces acting on each person. Oh, and both persons are still (0 velocity).
  44. B

    A question about masses on a pully

    Three block, connecting ropes, and a light frictionless pully comprise a system, as shown. An external force P is applied downward on block A. The system accelerates at the rate of 2.5m/s2. The tension in the rope connecting block B and block C equals 60 N. I don't have a picture but ill...
  45. H

    How to Calculate Acceleration in a System with Two Blocks and a Pulley

    A block of mass m1 = 1 kg rests on a table with which it has a coefficient of friction µ = 0.77. A string attached to the block passes over a pulley to a block of mass m3 = 3 kg. The pulley is a uniform disk of mass m2 = 0.7 kg and radius 15 cm. As the mass m3 falls, the string does not slip on...
  46. N

    Calculating Angular Acceleration for a Pully Problem with a Solid Cylinder

    M, a solid cylinder (M=1.39 kg, R=0.137 m) pivots on a thin, fixed, frictionless bearing. A string wrapped around the cylinder pulls downward with a force F which equals the weight of a 0.710 kg mass, i.e., F = 6.965 N. Calculate the angular acceleration of the cylinder. That I can do... But...
  47. N

    Calculating Tension and Acceleration in a Pulley System with Friction

    A 33.1- kg block (m1) is on a horizontal surface, connected to a 5.7- kg block (m2) by a massless string. The pulley is massless and frictionless. A force of 236.1 N acts on m1 at an angle of 30.9 °. The coefficient of kinetic friction between m1 and the surface is 0.217. Determine the upward...
  48. U

    Calculating Mass of Bucket to Descend 9.144m in 4s

    There is a pully with a rope though it. The rope of the left side is on the ground connected to a massless bucket. The right side has a man on a cliff about to jump on the rope. The man wants to descend 9.144m in exactly 4s. The question asks how much weight to put into the massless bucket for...
  49. K

    Calculating Mass with a Frictionless Pulley: A Physics Problem

    Ok I've been working on this problem for a while, and I'm kinda new to physics, so bear with me. So here it is: Heres the picture of the problem: A frictionless pulley with zero mass is attached to the ceiling, in a gravity field of 9.81 m/s2. Mass M2=0.150 kg is being accelerated...
  50. E

    Solve Max Mass for 3 Masses, 1 Pulley System

    I am having quite a time with this problem, I would appreciate any assistance. Block B, of mass mB, rests on block A, of mass mA, which in turn is on a horizontal table top . The coefficient of kinetic friction between block A and the table top is uK and the coefficient of static friction...