Pulley Definition and 1000 Threads

Homework Statement In the given figure if the masses A and B move down with a velocity 'v' at any moment then what will be the velocity with which mass W rises. A purely logical answer would be appreciated and please don't use calculus based approach, as I don't know calculus. Also...

Homework Statement Sum of downward forces exerted at A and B is 41lbs by the leg, what is the weight attached? Homework Equations None, really... The Attempt at a Solution Tension (T) throughout the system must be constant and equal to the weight (W). I first assumed that the leg...

Consider a massless string going over a massless frictionless pulley with masses M1 and M2 at the end of the string. The tension in the string would be same. The torque equation of the pulley says (T1-T2)=Iα .Now L.H.S is zero since T1=T2 and also I=0 . So,we have a condition 0=(0)(α)...

Homework Statement Due to settlement of soil, a recently planted tree has started to lean. To straighten it, the cable system shown is used, where a turnbuckle on cable AB is periodically tightened to keep the cable taut as the tree gradually straightens. If the force in cable AB is 395 N...

When we say of a pulley having friction, do we mean its axle about which it rotates has friction or the surface over which the string is wound has friction? Either way, if their is friction in a pulley, then when a string passes over the pulley, why does the string have different tension over...

I just can't get why for a massless inextensible string passing around a frictionless pulley we easily take T1=T2 (in fig.).My profs. never did explain this & jumped on further & when i ask them they won't answer saying it was very basic and other students say it's obvious. pls. help also pls...

A pulley with a radius of 10 inches uses a belt to drive a pulley with a radius of 6 inches. Find the angle through which the smaller pulley turns as the 10-inch pulley makes one revolution. State your answer in radians and also in degrees. can you rephrase the question for me. thanks!

Homework Statement Two masses, m1 and m2, are hung over a pulley as shown. Assume that m1 is heavier, that the pulley is massless and frictionless, and that the rope does not slip. The blocks are held motionless and then released. Determine the magnitude of the velocity of m1 after it has...

So at my gym, there's a cable machine that works like this: You pull on one cable and you lift x mass using y force. You pull the other and find the same thing. If, however, you pull on both, you're still only lifting x mass (you can see the weights) yet somehow each cable is still requiring y...

Homework Statement An object of mass m1 =45kg sits on a horizontal frictionless table. A rope is attached to it , which runs horizontally to a frictionless pulley , then down to a hanging mass m2 = 5kg a) the acceleration of each mass b) the tension in the rope Homework Equations...

Hi Here is my question: A solid disc pulley with a 5kg mass, radius of 0.5m has one layer of thin rope coiled around it. On the other end of the rope is a metal block with a mass of 10kg. Calculate the following (without take rope friction into account. also the rope does not slip): 1. The...

Hi I'm 40 and teaching myself physics from the internet and have the following question but don't where to start! Here is the question: A solid disc pulley with a 5kg mass, radius of 0.5m has one layer of thin rope coiled around it. On the other end of the rope is a metal block with a...

Could someone please explain to me where I am going wrong? I've tried combining the relevant equations below in multiple ways. Also, I'm not sure if my answer is given in rad/s2 or °/s2. Homework Statement A uniform solid disc of mass 1.2 kg and radius 0.24 m is free to rotate on a horizontal...

can sumone please explain me how to solve multiple pulley systems...right from relative acceleration to tension in srings...evrything in pulleys...

Homework Statement If there is a mass on a frictionless table connected by a string to another mass hanging from a pulley off the side of the table, is the net force on the string zero? Is the force of tension equal on both sides if the system is accelerating? Would both objects accelerate...

1. A simple Atwood’s machine uses a massless pulley and two masses m1 and m2. Starting from rest, the speed of the two masses is 2.2 m/s at the end of 2.9 s. At that time, the kinetic energy of the system is 85 J and each mass has moved a distance of 3.19 m (a) Find the value of heavier...

Q:Two blocks are tied together on an incline The first box is on a 30 degree incline with he horizontal and is 1 KG, the wire from it runs over a pulley that goes to a mass of 2KG . If both the pulley and the incline are frictionless: a) What is the acceleration of the 1.0 kg block up the...

Hello everybody! First of all,I would like to apologize for my English because I'm not a native speaker. I'm 16 and I have a pretty good knowledge on physics but I need help with solving certain type of problems. In my country we now have a summer vacation so I decided to look for a forum where...

Homework Statement See the image. Homework Equations T=Iα, F=ma, I=0.5*m*r^2, Friction=u*N The Attempt at a Solution I used the torque equation to get Tension = mcylinder*a/2, and then plugged that into a force equation for the block. mblockgsin(30)-Tension-Friction=mblock*a so...

Homework Statement Mass 1 is 20Kg, find m2 and m3 and the tensions please help I do not know where to start :( Please help.

Homework Statement Two construction workers each of mass m raise themselves on a hanging platform using pulleys as shown above. If the platform has a mass of 0.5m, the initial distance between the pulleys and the platform is d, and the workers each pull with a force f on the ropes, what is...

When we say "pulley is frictionless", do we mean its groove where the string moves or its axle or both?

Homework Statement A block of mass m1 is on top of a block of mass m2. Block 2 is connected by an ideal rope passing through a pulley to a block of unknown mass m3 as shown. The pulley is massless and frictionless. There is friction between block 1 and 2 and between the horizontal surface...

If I wanted to accelerate a mass faster than g would I just take a rod and connect two pulleys on each end but they would have different radii. And then I could wrap one with rope and tie it to a mass. And the other pulley would have a rope and a mass attached to it, and the rod would rotate on...

Homework Statement A 20.0 kg block rests on a frictionless inclined plane of slope angle 30.0 degrees. A light cord attached to the block passes over a frictionlesss pulley at the top of the plane and is attached to a second block. What must be mass of the second block if the system is to be...

Can a massless and frictionless pulley rotate if a string goes over it connecting two blocks of unequal weight? I think it shouldn't rotate and the string just skids/slides over the top of the pulley. Is it correct?

Imagine a standard pendulum. I understand how to work the physics on one but what if you attached that pendulum to a pulley at the top and could apply tension through the line? Let's say you released it at 45 degrees then some degrees later you applied some amount of tension through the pulley...

Homework Statement The system is in equilibrium and the pulleys are weightless and frictionless. The weights are 25 N, 4 N, 4 N, and 1 N. Find the tension T. The acceleration of gravity is 9.8 m/s^2. Answer in units of N Homework Equations F=ma The Attempt at a Solution Honestly...

Homework Statement This is a 2-part question A block of mass m1 is on top of a block of mass m2. Block 2 is connected by an ideal rope passing through a pulley to a block of unknown mass m3 as shown. The pulley is massless and frictionless. There is friction between block 1 and 2 and between...

I am having few doubts regarding pulley,strings and tensions . The doubts are 1)Can a massless pulley rotate ? My reasoning - Yes .Just like a massless string can accelerate with zero net force .The same way a massless pulley can rotate with zero net torque. 2)Is tension in a massless...

An 11KG weight and 33KG weight are suspended by a rope on a pulley. There is an air-resistance force of 77N working on all objects. Determine the acceleration. Fg=mg Fnet=ma ma=f1on2+f2on1 The force of gravity on the 11KG weight is 107.8N (11*9.8) and since this weight will be...

Homework Statement Two particles of masses 6 kg and 8 kg rest on two horizontal tables.The coefficient of friction between both particles and their respective tables is (1/2).The particles are connected by a smooth inextensible string which passes over smooth pulleys and under a smooth movable...

Homework Statement Blocks A and B are connected by a cable that passes over support C. Friction between the blocks and the inclined surfaces may be neglected. Knowing that motion of block B up the incline is impending when mB = 4.5 kg, determine: (a) the coefficient of static friction...

Hey everyone I am having problems with a pulley system. I think that my motor is too fast now I am not sure if that can affect the pulley system and actually result in it not rotating the belt on the pulley.

Problem As shown below, Block A has mass 'M' and rests on a surface with a coefficient of kinetic friction 'Uk' .The cord attached to A passes over a pulley at C and is attached to a block B of mass '2M'. If B is released calculate the acceleration of A. Assume the cord does not slip over the...

1. See Attachment 2. F = ma 3. For the block on the incline plane, I know it has Fnormal, Fweight, and Ftension. While the one hanging has Ftension and Fweight. Fn = 6gcos30 ƩFx = 6gcos30 - T = 6a 6gsin30 - (2g +2a) = 6a 6gsin30 -2g = 8a 2g(3sin30 - 1) = 8a a = 1.225 T =...

Here is the problem I am trying Two blocks A and B of same mass M are connected with each other with an ideal string of length 2l passing over an ideal pulley. The block A is connected to a light pan C with an ideal string as shown in figure. A particle of mass \frac{M}{2} is dropped on...

Hi, this is my first posting on this forum in the hope someone could assist me with a calculation. I have read several threads which I think partly covers my problem but to be honest the example answers given are way beyond my comprehension. Basically I need to raise a platform which runs...

Homework Statement Here is the picture: http://www.webassign.net/giocp1/8-p-058.gif I am to find Tension 1 ( that between crate one and the pulley) and tension 2 (that between crate two and the pulley). The mass of the pulley is MP. Homework Equations See below The Attempt...

Homework Statement A string passing over a pulley has a 3.80-kg mass hanging from one end and a 3.15-kg mass hanging from the other end. The pulley is a uniform solid cylinder of radius 4.0 cm and mass 0.80 kg. If the bearings of they pulley were frictionless, what would be the acceleration...

Hi : lets examine the following scenario 1. M --------- o where M is a mass, o is a pulley with it's outter radius r attached to a mass by the belt drive -------. frictionless. 2. M ---------O same setup but the radius is now bigger, R. I was reading...

Homework Statement Consider the Atwood’s pulley shown below. The masses are 4m, 3m, and m. Let x and y be the directed distances from the centers of the fixed (i.e. inertial) top pulleys for the left and right masses as indicated. http://imgur.com/VXEygxt a) Write down the Lagrangian...

I am building a prototype for an agricultural pulley system and I need help calculating how much horse power I need. The pulley system will need to drag a 400 lbs. object of a 45 degree incline for 150 feet. The static coefficient of friction is 0.1 and the kinetic friction is only 0.05...

Homework Statement Find the time period of the oscillations of the body whose mass is m when it is displaced slightly form equilibrium. All springs have spring constant k and the pulleys and strings are massless and frictionless. Homework Equations T=2∏\sqrt{\frac{m}{K}} where T is...

Homework Statement Two particles of masses 8 kg and 5 kg are connected to the two ends of a light inextensible string which passes over a fixed smooth pulley. Initially each of the two particles are held at a position which is 5 m above a horizontal ground. The objects are then released from...

Homework Statement Two particles A and B, of masses 2m kg and m kg respectively, are connected by a light inextensible string which passes over a fixed smooth pulley. The system is RELEASED from REST, with both portions of the string vertical and taut, while A and B are at the SAME HEIGHT. 1...

Hi there, I'm having some problems trying to write down the Lagrangian of the following system: A uniform flexible chain of mass M and length L is hung under gravity on a frictional pulley of radius a and moment of inertia I whose axle is fixed at a point above the ground. Write down the...

The method I'm using in the image is the one that makes the most sense to me, but I've tried others and still cannot get at the stated answer, which is 2.65 rad/s^2

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...