Pulley Definition and 1000 Threads

Homework Statement Note that the FAQ is not clear if I am required to use LaTeX for formatting formulas. I have not used LaTeX, but I will retype my question if I am violating the rules. Please let me know :-) Non-extensible cable attached to ceiling. Cable goes down, around a pulley and...

This question seems incredibly straightforward, but my lecturer had a different answer to what I ended up with. Essentially there's a painter with a mass of 70kg sitting on a chair of 10kg that is attached to a pulley on the roof via a rope (the pulley and rope are ideal,massless and...

Homework Statement The figure below shows an object on an inclined ramp of mass 0.98kg. The angle of the inclined surface is 32deg with the horizontal. The object on the ramp is connected to a second object of mass 2.13kg on a horizontal surface below an overhang that is formed by the inclined...

The problem is: The two blocks in the figure are connected by a massless rope that passes over a pulley. The pulley is 12cm in diameter and has a mass of 2kg. As the pulley turns, friction at the axle exerts a torque of magnitude 0.5Nm. If the blocks are released from rest, how long does it take...

In the attached picture, one sees a pulley with a mass which is holding two different weights. In chegg, the tension due to a weight is represented as a downward direction. Then, when the tension is seen in relation to the pulley, the direction switches for both weights. WHY IS THIS...

Homework Statement Two masses are connected by an inelastic string over a frictionless pulley. M1 is 4 kg and the coefficient of static friction between M1 and the inclined plane Us = 0.25. What minimum and maximum amount of mass can M2 have so that M1 remains stationary on the plane? (In the...

Homework Statement A pulley 150 mm diameter is driven directly by an electric motor at 250 revs min-1. A V-belt is used to transmit power from this pulley to a second pulley 400 mm diameter against a load of 200 Nm. The distance between the centre of the pulleys is 600 mm, the included...

Popeye was lifting himself to the top of a 30m mast until he was 10 m away from the pulley. The rope was 100m long and weighed 50kg and he would pull himself off of the ground using a slow constant speed. How hard was he pulling when he was 10m below the pulley?

Hi All, I am an old dog, and rusty propeller head. I am having the most difficult time figuring out the forces on a pulley system I am working on. Can someone please review my sketch and tell me if I am even close. I would accept any suggestions and direction. Much Obliged -Steve

Homework Statement M1=5.0kg μs1=0.30 M2=? μs2=0.20 What does M2 need to be in order to move? The interesting thing with this question is if it does move, will it move up or down? Homework Equations Fun=ma Ffs=μsFn The Attempt at a Solution I thought about this and if it's...

I am a high school teacher tutoring a family member in an introductory university class. I have good knowledge of typical pulley questions and semi-decent knowledge of angular acceleration (it is no longer in the high school curriculum here and I am out of practice). Can anyone give me a...

Homework Statement One end of a horizontal string is attached to the wall, and the other end passes over a pulley. A sphere of an unknown material hangs on the end of the string. The string is vibrating with a frequency of 392 cycles per second. A container of water is raised under the sphere...

Homework Statement A light rope is attached to a block with mass 4.00 kg that rests on a frictionless, horizontal surface. The horizontal rope passes over a frictionless, massless pulley, and a block with mass m is suspended from the other end. When the blocks are released, the tension in...

Homework Statement Each of the two systems is released from rest. Calculate the speed v of each 47-lb cylinder after the 38-lb cylinder has dropped 5.2 ft. The 17-lb cylinder of case (a) is replaced by a 17-lb force in case (b). I have attached an image of the question. Homework...

Homework Statement Two masses ##m_1## and ##m_2## are connected by a massless cord and a pulley, on a rough ramp, tilted at angle ∅ The pulley is massless and frictionless. The coefficient of kinetic friction between the ramp and m1 is ##μ_k.## Derive an expression for ##m_1,## given that...

Homework Statement The usual configuration of an Atwood's Machine. Two masses: m1, m2 Accelerations (unknown): a1, a2, ap (Pulley) Rope Tension: T (Unknown) BUT: Massive pulley: mp Upwards force acting on pulley (i.e the pulley is not in equilibrium): F NOTE: Consider that all the...

Homework Statement I believe that I have my answer. I would appreciate it if someone could check my work. m1 = 33 kg m2 = 14 kg μ = 0.19 Angle is given by 5,12,23 triangle shown in figure. Assume pulleys are massless. What is the acceleration of mass m2 on the incline plane...

Why can $H = \left(\ell - \frac{b}{\sin\theta}\right)$ where $\ell$ is the length of the rope. (everything is frictionless.) http://img690.imageshack.us/img690/579/pulley.png

So basically, at my work at a science center, we have this exhibit where you lift yourself using different pulleys. I noticed that the pulleys were labeled wrong. They should have been, 1/2, 1/3, and 1/5 but were labeled, 1/3, 1/4, and 1/6. I brought this up with management and received an email...

Firstly, I'm sorry for posting this here it seems like the best place possible, but I'm not quite so sure I didn't see a section for civil engineering. So I don't understand why a movable pulley increases the mechanical advantage. This occurs in a situation when one end of the string is fixed...

Homework Statement http://media.cheggcdn.com/media/76d/76dd5c56-43a5-44d3-b8b8-40ba63a9010a/phpYYNJyN.png Cable ABC has a length of 5 m. Determine the position x and the tension developed in ABC required for equilibrium of the 100 kg sack. Neglect the size of the pulley Homework...

Homework Statement Could anyone give me an idea of how to start this problem to work out the resultant force's magnitude, direction and couple in the top (alternator) pulley? Does the 30° angle affect the equations? As all the notes I have seem to only have pulleys with the force at each...

Homework Statement http://prntscr.com/otut8 Find acceleration of block 1, knowing that the mass of block 1 is 2kg and of block 2 is 4kg. You may ignore friction and pulley mass. Homework Equations Fr = ma The Attempt at a Solution I Drew free body diagrams to block 1, 2 and the...

Homework Statement All data is in the attached image. The lower pulley has rotation velocity of 0.6 rad/s but I don't understand why. Both pulleys have same radius and the same rope passes through both of them so why are their velocities different? Homework Equations ω = v/r The...

Homework Statement A system comprising blocks, a light frictionless pulley, a frictionless incline, and connecting ropes is shown. The 9 kg block accelerates downward when the system is released from rest. The acceleration of the system is closest to: A.) 1.9 m/s^2 B.) 2.1 m/s^2 C.) 1.7 m/s^2...

Three objects with masses m1 = 66.0 kg, m2 = 37.4 kg, and m3 = 21.8 kg are hanging from ropes that run over pulleys. What is the acceleration of m1? (Take the upward direction to be positive.) So for the two outside blocks, I know that the forces acting on the blocks are T1=m2g+m2a, and...

Homework Statement Sorry to be posting here but trying to look for previous similar questions I just managed to baffle me further! This is just me trying to revise and came across this.. Two masses of 10 kg and 5 kg are joined by a cable and placed over a massless frictionless pulley as...

Here is a tricky one (for me) that uses linear mass density and two masses. I don't really know which to do so I did both! Homework Statement An object can be hung from a string (with linear mass density μ=0.00200kg/m) that passes over a light pulley. The string is connected to a...

A stone is suspended from the free end of a wire that is wrapped around the outer rim of a pulley, as shown in the figure. The pulley is a uniform disk with mass 11.3kg and radius 49.0cm and turns on frictionless bearings. You measure that the stone travels a distance 12.3m during a time...

Homework Statement An object with a mass of m = 5.10 kg is attached to the free end of a light string wrapped around a reel of radius R = 0.250 m and mass M = 3.00 kg. The reel is a solid disk, free to rotate in a vertical plane about the horizontal axis passing through its center. The...

Homework Statement 2 equal masses (massA, massB) are raised up a pulley, at a constant velocity. massB has a velocity twice as fast as massA. What is the force acting on these 2 masses? Homework Equations The Attempt at a Solution If it is a constant velocity, the upwards force...

Homework Statement A 2.85 kg bucket is attached to a disk-shaped pulley of radius .121 m and mass .742 kg. If the bucket is allowed to fall, what is the linear acceleration, angular acceleration, and how far does it drop in 1.5 seconds. I really only need help with the first part since...

Homework Statement A 1.3 kg block is tied to a string that is wrapped around the rim of a pulley of radius 7.2cm. The mass of the pulley is 0.31kg. The block is released from rest. If the velocity of the block is 3.0m/s after it falls 0.5m, what is the moment of inertia for the pulley?[/b]...

Homework Statement The problem is based in the diagram (the jpg attached). All pulleys are ideal pulleys, and the hanging surface is massless. the problem states that the guy with mass m pulls each string with a force F, and asks to solve the value of F in terms of m and g. Since the...

Homework Statement In the problem, a hanging block, m, is attached to a pulley that is mounted on a horizontal axle with negligible friction. The pulley has a mass of M=75kg and a radius of R=6.0cm. The mass of the hanging block is m=1kg. The block is released from rest at a height above the...

---see attachment for picture of problem--- There is no actual numbers given. We are supposed to be solving for acceleration and I tried but can't find an answer. I'll show you my work and please tell me what I did wrong Ʃfx= Ff + T - w1sinθ = m1ax = 0 Ʃfy= N - wcosθ = m1ay Ʃfx= 0 = m2ax = 0...

In Fig. 10.45, block 1 has mass m1=460g, block 2 has mass m2=500g, and the pulley, which is mounted on a horizontal axle with negligible friction ahs radius R=5.0cm. When released from rest, block 2 falls 75.0cm in 5.00 s without the cord slipping on the pulley. (e) What is its rotational...

Homework Statement A block of 4 kg hangs from an ideal string which passes by a pulley and is attached at the other end to a block of 6kg, which is in turn lying on a rough table of friction coefficion μ=0.2. The block on the table is pushed towards a spring with elastic constant k = 60 N/m...

Homework Statement "What are the input forces needed to lift the 200 N load for the arrangement shown?" Notice how there are two movable pulleys that move in opposite directions as the weight is lifted. That is the confusing part to me. Homework Equations Ma=Fo/Fi The Attempt at...

http://www.chegg.com/homework-help/questions-and-answers/consider-situation-shown-figure-40-kg-mass-replaced-65-kg-mass-frictional-coefficient-0301-q1351583 I missed class recently, and I don't understand how to do compound body problems. Any help would be appreciated!

First off,I would like to apologise for not introducing myself. I have yet to find that certain part of the forum,but if the mistake was on my part,mods please direct me. Now to go to the real issue. This is something I've long "gotten over",meaning it was in the introductory lessons in...

I need to lift 75 pounds when only using 4 pounds of force. Is there a gear set or pulley system that can do that? Thanks

Homework Statement please take a look at the picture m1= 4kg m2= 5kg angle is 30 degrees (surfaces are frictionless) find the acceleration and the tension what are the formulas used for solving this?

1a. Homework Statement Hi all, I'm having quite a bit of problem on a physics question. I've seen some examples of this problem, but when I follow the suggestions and equations out, the answer I get back is wrong... Anyways, here's the problem: Given two masses (m_1,~m_2) hanging from...

Homework Statement Look at figure 4 Two blocks are attached to mass-less ropes and pulleys that have negligible mass and negligible friction. a. Find the connection between the tensions in the ropes. b. Find the connection between the accelerations of the blocks. c. Calculate...

1. I am stuck. Could anybody push me in the right direction? Best Regards Lasse

A 3.8-kg sphere is suspended by a cord that passes over a 1.3-kg pulley of radius 3.5 cm. The cord is attached to a spring whose force constant is k = 86 N/m as in the figure below. Assume the pulley is a solid disk. (a) If the sphere is released from rest with the spring unstretched, what...

Homework Statement Consider 2 masses (m1=13kg, m2=26kg) connected by a string. The pulley is a uniform disc of radius R=0.05m and mass m=1kg. μ between the horizontal surface and the larger mass is 0.2. Find Frictional force acting on larger mass. Find the linear acceleration of the...

THANKS, I ONLY NEED HELP #2 NOW, PLEASE 10/31/12 @ 9:10 pm bumpHomework Statement 1)If the fulcrum of a 0.1 kg meter stick was placed at the 40 cm mark and a 200 g mass at the 0 cm mark, would it be possible to balance the meter stick with a 200 g mass on the long side of the meter stick? What...

There are two bodies of mass 5kg and 1 kg on either sides of a pulley. (The string stays vertical and straight at all times). The heavier mass is doubled. The downward acceleration on the string of the hevier mass is "x". Find "x" when g=10m/s-2. Please help fast! Desperate!