Pulley Definition and 1000 Threads

Homework Statement Q. In the figure shown, find out the value of θ [ assume string to be tight ] Homework Equations The Attempt at a Solution If the pulley was not moving ,then we could have equated the component of velocities of the two blocks along the string . But,since...

Homework Statement No friction, pulleys and also string are weightless, the tension through the string is distributed uniformly. Find the acceleration of the mass 3M (see image attached) Homework Equations II law of Newton The Attempt at a Solution Well I wrote such equations for...

Dear Advisor, I tried to read books and searched all around before posting new topic here... I'm carying out testing a hoisting winch at load 400 kN through a system as in picture. My problem is that due to fiber rope i only can measure exactly wire tension by a load cell installed through...

Homework Statement Basically, I need to calculate the mass of the pulley and friction using data that I collected. Homework Equations I was given: (m1 - m2)g = (m1 + m2 + mp)a + f The Attempt at a Solution For the first part, I collected data using a sensor to find the...

Homework Statement Find V if the pulley is massless, friction less and Can take any no of variables but V is be in terms of VP.Ignore gravity and other forces 2. The attempt at a solution If Pulley comes down by X, the length of string towards left(the side not fixed) will increase by...

Hello everyone, First of all, I want to excuse for my not perfect English since it isn't my mother tongue. However, now to my problem, which I'm facing at the moment. As part of my master thesis I have to simulate the application of a fastening device, which I develope during my master...

Homework Statement The diagram is attached. The description of the setup is in the second attachment. I do have solutions to the problem, but I don't understand parts of it. Questions: a) What is the initial pressure in the liquid? b) Please show that the magnitude of the tension in...

As I understand it, pulleys will reduce the force needed to lift objects but require a greater distance. As the number of pulleys increase, the force decreases. But for all cases of pulleys, the work required to lift a given object to a given height will always remain the same. When I attach...

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 angle of the pulley groove =...

Homework Statement A 8.0-cm radius disk with a rotational inertia of 0.12 kg*m^2 is free to rotate on a horizontal axis. A string is fastened to the surface of the disk and a 10-kg mass hangs from the other end. The mass is raised by a using a crank to apply a 9.0-N*m torque to the disk. The...

Homework Statement Homework Equations The Attempt at a Solution Well, I tried working on this problems a few different ways and kept hitting a dead end. The work in "relevant equations" was my last attempt. I have spent well over an hour on this problem and I am ridiculously...

Can someone explain this please?? Weird pulley with Tension Homework Statement See attached picture for problem Homework Equations n/a The Attempt at a Solution The answer is B. No idea why. Any help would be appreciated. Thanks!

Homework Statement A force of 25 N is applied on the pulley. M1 = 1.5 kg, M2 = 2.5 kg, light frictionless strings and pulley. a) What is the tension in the strings? b) What is the acceleration of the masses? c) What is the minimum Force to apply on the pulley so that M2 comes off the...

What would happen if the bore hole of a pulley in a conveyor was significantly larger than the shaft like in the figure below: I would imagine if the RPM was high, the whole system would shake violently. However, what if the RPM was around 30 RPM. Would the conveyor still function properly...

Homework Statement I need to find a formula for the friction in the system. I had a disk and a pulley connected to a rotation sensor on each side. I wrapped a pulley with a string and there was a small mass attached to the bottom. As I let that mass fall, it would fall and spin a pulley...

In the figure attached, we have one section which has three bars all pin-connected together and pin fixed on the ground. We have two pulleys connected with the section by string. And we have one string starting from the left fixed pin to the right fixed pin. I am thinking whether the tension...

Homework Statement A disk of mass M and radius R unwinds from a tape wrapped around it. The tape passes over a frictionless pulley and mass m is suspended from the other end. Assume that the disk drops vertically. a. relate the accelerations of mass m and disk ,a and A, respectively to...

Homework Statement ---Find Angular Speed--- Homework Equations I = 1/2 mR^2 Ug = mgdsinθ Us = 1/2 kd^2 KE = 1/2 I w^2 The Attempt at a Solution Moment of inertia of reel = 1/2mR2 Kinetic energy of the reel = 1/2 mv2 = 1/2(1/2mR2) w2 KE = mgdsinθ (potential due to gravity) +...

Homework Statement A 1.00-kg aluminum block and a 4.00-kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle 31.0°). The aluminum block is on the left side, on a flat plane. On the right is the...

Homework Statement The descending pulley (disc shaped) shown in the figure have a radius 20 cm and moment of inertia 0.20 kg-m2. The fixed pulley is light and the horizontal plane frictionless. Find the acceleration of the block if its mass is 1.0 kg.Homework Equations The Attempt at a Solution...

A uniform heavy rope of length 2l goes over a small smooth pulley such that the right end has length (l+a) while the left end has length (l-a). The shorter portion is held and then released. Find the time taken for the rope to slip off the pulley.

A 1.2·kg block is tied to a string that is wrapped around the rim of a pulley of radius 7·cm. The block is released from rest. Assuming the pulley is a uniform disk with a mass of 0.37·kg, find the speed of the block after it has fallen through a height of 0.43·m. 2. F=mrω^2 and possibly F=mg...

Homework Statement Two masses 53gms and 45gms are connected by a light inextensible string passing over a smooth pulley and hung freely. Find a) the velocity after 3 seconds b) distance traversed in 3 seconds c) distance traversed in the third second d)if the string is cut after 3 seconds how...

Homework Statement There is pulley which has a mass hanging from one side, and a rotating rod attached horizontally to the other (both by cables). The pulley has mass; Mp = 9.5kg and radius; Rp =0.2m. The block(A) has mass; Ma=10.9kg. The rod is L = 0.8m long and has mass=Ml7.9kg. The rod is...

The problem and solutions: http://i.imgur.com/hxlfbmZ.png I was able to solve the first two questions, but I guessed part C. For the first one, I thought of the two blocks as one unit (since there's no friction or air resistance). If they're both falling with the same acceleration, there...

Alright, so I'm doing this homework problem: "A 32·kg block is connected to an empty 1·kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.41 and the coefficient of kinetic friction between the table and the block is...

Homework Statement I don't really understand how to determine the forces in a pulley system. Like in this picture : http://postimg.org/image/4vxrf59ar/ How do you decide what forces are present for the pulley? Why isn't there a 375lb on the right side as well? What would be the pulley forces...

Okay, so I did a lab where we had a 2 pulley system that involved a string and three masses. The string is set up so it is in the shape of an m when put on the pulleys. The known mass is put on the middle string (m3) hanging down and the two outside masses (m1) and (m2) are unknown and are not...

Homework Statement An object is hanging by a [mass-less] string on a [mass-less] pulley from a cart on a desk with a mass of 1.8 kg. The cart has an acceleration of 2.5 m/s^2. Calculate the mass of the hanging object given that: a) There is no friction. b) There is a frictional force of...

The question I am given is as follows: A string is wrapped around a pulley of radius 3.25cm, and a weight hangs from the other end. The weight falls with a constant acceleration 3.10m/s^2. 1. What's the angular acceleration of the pulley? 2. If the weight starts from rest 1.55m above the...

Homework Statement The pulley can rotate and has no friction. Block m_2 is twice as big as m_1 Find the tensions, T_1, T_2, T_3 Homework Equations Newton's second lawThe Attempt at a Solution Tension 1: By creating a free body diagram only for the block, I got with Newton's second law...

Homework Statement The figure shows a 100 kg block being released from rest from a height of 1.0 m. It then takes 0.90 s to reach the floor. What is the mass of the block on the left? Illustration shows a pulley connected to the ceiling, with a block of 100 kg on the right, and a...

Homework Statement m_2>m_1 The pulley rotates. Find the tensions, T_1, T_2, T_3 Homework Equations Newton's laws The Attempt at a Solution I know how to solve the problem if the pulley doesn't rotate because the systems would be in equilibrium (Newton's first law) and dividing...

Homework Statement A string is wrapped around a pulley of radius 3.45cm , and a weight hangs from the other end. The weight falls with a constant acceleration 3.00m/s2 . What's the angular acceleration of the pulley? Homework Equations i'm writing out the equations i would think that...

Homework Statement http://puu.sh/4PDPV.png Homework Equations τ = I*α τ = r*F The Attempt at a Solution EDIT2: Nevermind, manipulated the torque equations wrong, got it now EDIT: Tried again and ended up with an actual answer, but still got it wrong :/ This is the FBD I used...

Homework Statement Hello, everyone. I am a starting physics student. I know a little bit of calculus and mechanics. I have been solving a lot of problems successfully, but I come back to being stuck on this one. I will show you what I have done and I hope you can be kind enough to give me a...

Homework Statement m1 has a mass of 47 kg and m2 has a mass of 35 kg. the coefficient of friction between m1 and the surface of the inclined plane are us=.42 and uk=.19 m1 is on an inclined plane angled 25 degrees A) if the masses are held in place and then released, will they start to move...

Homework Statement m1 has a mass of 47 kg and m2 has a mass of 35 kg. the coefficient of friction between m1 and the surface of the inclined plane are us=.42 and uk=.19 m1 is on an inclined plane angled 25 degrees A) if the masses are held in place and then released, will they start to move...

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A pulley has a radius of $12.96\text { cm}$ it takes $18\text { s}$ for $56\text { cm}$ of belt to go around the pulley. (a) find the angular speed of the pulley in $\displaystyle\frac{\text {rad}}{\text{s}}$ well from $\displaystyle\frac{56\text { cm}}{18\text{ s}} \approx \frac{3.11\text {...

A 8.10-kg hanging object is connected by a light, inextensible cord over a light, frictionless pulley to a 5.00-kg block that is sliding on a flat table. Taking the coefficient of kinetic friction as 0.190, find the tension in the string. I don't know if my equations are right or where to go...

Homework Statement A 230-g air track glider is connected to a string hanging over a frictionless pulley. A 100-g mass hangs from the other end of the string. a) Draw force diagrams for the glider and the hanging mass. b) Find the acceleration of each. Homework Equations F=ma...

Homework Statement A light smooth pulley is attached to a support a fixed height above the ground. An inextensible string passes over the pulley and carries a mass 4m on one side. The other end of the string supports a similar mobile pulley; over this passes a second string, carrying masses of...

Give the correct tension, T, in the marked rope for each situation. The rope is held so the system is stationary. All ropes and pulleys are massless and frictionless. Follow link for a picture of the pulley systems: http://i.imgur.com/2eBZpC3.jpg A) T = W B) T = W/2 C) T = W/3 D)...

I need help understanding why in problems tension is modeled as T-mg = ma. I understand there are different variations, but the main concept is what I need help with. For example: If i have 2 masses hanging off a pulley (m1=5kg & m2=10kg) then m1 has a downward force of 49N down. The...

http://puu.sh/4DtNc.png I solved this question, but I don't understand why this worked. I feel like for the final line in my solution it should just be divided by M1, not the combined mass of both blocks. Isn't this synonymous with just M1 being pulled up the ramp by a guy at the top...

Homework Statement There's a picture with the problem attached A block with mass m = 1.5 kg hangs to the right of two blocks with masses m2 = 2.2 kg and m1 = 1.2 kg which sit on a table. All three blocks are connected with a string and pulley. Neglecting the mass of the pulley, string and any...

Homework Statement Two blocks are connected by a thin inextensible string over a frictionless massless pulley as shown on the picture below The acceleration of gravity is 9.8 m/s2 Given that the two blocks move at 1.9 m/s under an acceleration of 4.1 m/s2, calculate the coefficient µk...

The system is in equlibrium,find T1 and explain. Thanks.

A picture speaks a thousand words. In this video, at 41 seconds: [URL="http://www.youtube.com/watch?v=FBZWZfbxeJw"] Eugene R transfers power to a pulley attached to a rod but only the pulley spins. I am in the process of fabricating a pulley system like this. My question is: How is this done?