Pulleys Definition and 384 Threads

Homework Statement Hey guys I'm really having problems understanding this despite looking at the solution, which is fully laid out here: http://iweb.tntech.edu/murdock/books/v1chap4.pdf I know that m2 moves twice the distance that m1 moves. I have tried looking at each rope as a...

[b]1. A mass m1 is attached to a second mass m2 by a rope that goes over a frictionless and massless pulley. Mass m1 is being pushed down a rough inclined plane with force F. The Angle of the incline is θ1, the force pushing m1 is acting at an angle θ2 . and the coefficient of kinetic friction...

A belt contects two pulleys with radii $\displaystyle5\text { in}$ and $3\text { in}$ the $\displaystyle5\text { in}$ pulley is rotating at $\displaystyle\frac{1000\text{ rev}}{\text{min}}$ What is the linear $\displaystyle\text{v}$ in $\displaystyle\frac{\text{ft}}{\text{sec}}$ of the belt...

two pulleys connected by a belt have 15cm and 8cm radius The larger pulley rotates $25$ times in $36$ sec, Find the angular speed of each pulleey in radians per second. the 15cm pulley has circumferce of $30\pi$ so $\displaystyle\frac{25\text { rev}}{36 \text {sec}} \cdot\frac{30\pi\text{...

Homework Statement https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-prn2/v/1234318_630176667033105_887013223_n.jpg?oh=0197e43e2263a6cffc784ffa9e6da3b0&oe=5244B77F&__gda__=1380228307_39b71a04cd5c0b63205a9b7139f9a620 hey guys, I managed to take a picture of the problem. I am in gr 12...

1. Homework Statement Solve for T (The force required to keep the pulleys at equilibrium) See attached image for pulley setup. 2. Homework Equations W2>W1 N=mg 3. The Attempt at a Solution Currently I have drawn out all the forces that act on each pulley, and I know there...

In the figure below, the pulleys and the cord are light, all surfaces are frictionless, and the cord does not stretch. http://awesomescreenshot.com/0301qqz07c How does the acceleration of block 1 compare with the acceleration of block 2? (Use the following as necessary: m1, m2, and a2.)...

I have a problem. Lets say there were two pulleys put at equal height. You have a metal ring and attach three wires to it. At the end of each wire, have three weights of mass w. One weight hangs down, one weight goes over one pulley and the other over the other pulley. The system goes to...

The diagram shows two particles, A of mass 5m and B of mass 3m, connected by a light inextensible string which passes over two smooth, light, fixed pulleys, Q and R, and under a smooth pulley P which has mass M and is free to move vertically. Particles A and B lie on fixed rough planes inclined...

Homework Statement A block of mass m1 is attached to a block of mass m2 by an ideal rope passing over a pulley of mass M and radius R as shown. The pulley is assumed to be a uniform disc rotating freely about an axis passing through its center of mass (cm in the figure). There is no friction...

Homework Statement there are three masses m2 is on a table top with coefficient of friction of 0.350 with two different masses on each side. They are connected by a mass-less string and friction-less pulley m1=4kg m2=1kg m3=2kg 1.]find the acceleration of all three masses...

I need help with this attached question! The answer is supposedly B because of something to do with lever arms. But I don't get it at all!

Homework Statement Why are pulleys frictionless and massless in the pulley questions? What would happen if they are not frictionless and not massless? Why are the strings connecting the blocks in pulley questions massless and inextensible? What would happen if they are not massless an not...

I know in a double pulley system, the rope moves twice the distance of the load. What about a system such as this? Would the stretch distance of the spring be twice the moved distance of the load? I'm having trouble visualizing these things. Thanks!

I've already tried this problem but yielded an impossible answer: Homework Statement We have a pulley with a mass-less rope attached to two masses hanging off each side of the pulley: -m1 (4kg), suspended 1m off the ground -m2 (2kg), on the ground The mass (M) of the pulley is 2.6...

Homework Statement (see attachment) Homework Equations The Attempt at a Solution Case a) i)F=160N F is enough to overcome the static friction acting on block ##m_1##. Hence during motion kinetic friction acts and due to Newton's third law, an opposite and equal force acts on...

Homework Statement (see attachment) Homework Equations The Attempt at a Solution At equilibrium conditions, the forces acting on ##m_2## are the tension due to the strings and its weight. ##T=m_2g+T'## where T is the tension in the string above ##m_2## and T' is the tension in the...

Homework Statement I got into a disagreement with a fellow student today. He insisted that it's possible to simplify the system on the right as the system on the left. I agree with him that the difference in potential energy (and, therefore, the kinetic energy) is the same but I insist that...

Homework Statement I am a little confused about the concept of tension as it relates to pulleys. I am studying torque right now, and it says in the textbook that the tension in the rope around a pulley produces a torque that causes the pulley to turn. I don't fully understand this. I thought...

Homework Statement The question shows two 5kg masses at rest hanging from two pulleys on opposite ends of a table. The string is massless and the pulley is frictionless. Homework Equations They want to know what the spring scale reads (in the middle of the masslessstring). The...

Homework Statement Calculate the tension T in case a, b, and c if acceleration = 0. Ws = weight of the bottom pulley W = weight of the weight Homework Equations mg - T = m*a The Attempt at a Solution For a, it just seems like T = Ws + Wm since the bottom pulley is connected to...

Homework Statement http://learn.uci.edu/media/OC08/11004/OC0811004_L6Pulley.gif Homework Equations The Attempt at a Solution OK so I am a bit confused about how pulleys work. Assume the pulley in the diagram is massless and frictionless and that ropes/hinges are massless. Now...

Homework Statement A man is trying to lift a box using three pulleys and two peices of rope. Each pulley can turn without friction and has negligible mass.The first rope, attached to the man, paases down under pulley A, up over pulley B and down to the frame of pulley C. The second rope is...

Homework Statement Homework Equations F=ma fk=μR The Attempt at a Solution What's wrong in my work? Is a(B) not equal to a(A)? Why?

Homework Statement Three objects mI. m2 and m3 are suspended from three massless and frictionless pulleys as shown in the diagram. ml is 6 kg, m2 is 2 kg and m3 is 3 kg. Find the tension of the string when the system is set in motion (i.e. all masses are moving). Answer in N Options are: (a)...

Homework Statement A mass m1 is pulled along a frictionless horizontal surface by a rope of tension T1, which passes over a pulley of mass mP1 to a hanging pulley of mass mP2, after which it is fixed to the ceiling, as shown in Fig. 1. Labeling the tension between pulleys 1 and 2 T2, and that...

Homework Statement An environmentally-sensitive daredevil wants to use a large mass, a rope, and a pulley to accelerate toward ramp while his motorcycle is in neutral, as shown below. If friction is negligible, what will the acceleration of the motorcycle be and the tension of the rope...

Hi. I'm new here, and decided to sign up now that physics is actually difficult for me in first year university... Hope to find the help I need, and help those that I can. Anyway.. I'm having trouble with these wordy physics problems... 1) A light rope passing over a light frictionless pulley...

Multiple Pulleys! Homework Statement A 60 kg mass and a 10 kg mass are attached together by massless inextensible strings which pass over light frictionless pulleys. One pulley is free to move while the other is fixed. a) The system is initially held at rest by means of a force supporting the...

Homework Statement A block with a mass of 25 kg is hung midway between two pulleys, with a rope connecting a hook at the top of the block to each of the two pulleys. On the other side of the pulleys, both ropes are connected to blocks with masses of 15 kg. The 25 kg mass in the middle sags...

Homework Statement A block with a mass of 25 kg is hung midway between two pulleys, with a rope connecting a hook at the top of the block to each of the two pulleys. On the other side of the pulleys, both ropes are connected to blocks with masses of 15 kg. The 25 kg mass in the middle sags...

Ofcourse we can write the equations for blocks on a single fixed pulley taking the tension upwards and weight as downwards and then equating according to the acceleration. Can we write equations for the string (massless or with mass)?

This is 2 problems that continue one another; I solved the first one but do not understand the second. Homework Statement A 100kg man dangles a 50kg mass from the end of a rope. If he stands on a frictionless surface and hangs the mass over a cliff with a pulley, the tension in the rope will...

Homework Statement Here is a picture that I putted together(see attached picture). m1= 0.235 kg N = m1g = 2.303 N m2= 0.350 kg m2g = 3.430 N fk= 0.590 N By measurement, I confirmed (d1)=4(d2). Therefore, (v1)=4(v2), a1= 4(a2). Homework Equations ƩFx=(T1)-fk=(m1)(a1)...

Homework Statement The experiment in my Physics lab today was to determine the mechanical advantage and efficiency of various pulley systems. My calculated work output is higher than my work input, which is causing an abnormally high value for efficiency, and I am attempting to find the source...

Multiple Pulleys and Masses with Friction (Picture Included) Homework Statement http://content.screencast.com/users/Waraa/folders/Snagit/media/2d699ba1-32e0-4d9c-b79f-1a1d85dccd12/03.19.2012-15.49.46.png I have solved the question but I am still iffy as to whether my solution is correct...

pulley Homework Statement Two masses are attached together by means of light inextensible strings and light frictionless pulleys as shown in the diagram. The system is released and the upper block slides along the table. The coefficient of friction between this block and the table is 0.32...

Homework Statement coefficient of kinetic friction = 0.15 Find the acceleration of block a. Homework Equations see below The Attempt at a Solution http://www.wolframalpha.com/input/?i=-200sin30%2B0.15*200cos30%2B2x%3D-200%2F32.2*a%3Bx-40%3D40%2F32.2*b%3Ba%3D0.5*b I used x for...

Can anybody please tell me how pulleys and levers multiply forces without using ideas such as input power(or work)= output power(or work), torque etc. I can't understand the basic mechanism behind it. Please check out my doubt attached to this thread as a bmp image.

Hi all, brand new to the forums. I'm a student of chemistry so I am very unknowledgeable about mechanical engineering and need some help. Not asking for spoon-feeding. What I am trying to accomplish is fairly simple(I hope). I would like an electric DC motor to turn a 1in diameter teflon...

Homework Statement Two objects of masses m1 and m2 are connected via a massless string and ideal pulleys. The coefficients of friction between m1 and the horizontal surface are ms and mk a) what condition needs to be met to set the system in motion? b)assuming that this condition is (barely)...

Hi all, I'm really stumped at this question five of my assignment. Could anyone please give me some help? I don't even know where to start. Thanks

Homework Statement Please refer diagram attached. The pulleys are moving down with constant speed u each. Pulleys are light , string ideal. What is the speed with the mass moves up? Homework Equations The Attempt at a Solution Now, I got the answer as ucosΘ, obviously...

Homework Statement For the truss find the reactions at point A and B. For pulley, find the relation bet acc of A and block B. Homework Equations The Attempt at a Solution For the truss, take moments at B. F212 + NA12=F110 NA=-2kN which is wrong. Where did I go wrong? ans is...

Belts and pulleys for WIND TURBINE ? Hi, I have been working on a Vertical Axis Wind Turbine. The blades I am able to fabricate produce more torque than speed. I am adding a synchronous belt drive transmission. The current configuration is 1 rpm at the input and 7 rpm at the output. I have...

Homework Statement The block B moves to the right with a constant velocity of 30 cm/s. Given this, which of the following is correct: 1. Speed of block A is 15 cm/s 2. Speed of point P is 60 cm/s 3. Speed of point P is 30 cm/s 4. Speed of block A is 40 cm/s Homework...

Homework Statement If a1 and a2 are the accelerations of m1 and m2, respectively, what is the relation between these accelerations? Homework Equations Link to the diagram : http://www.webassign.net/serpop/p4-38.gif The Attempt at a Solution The answer is a1 = 2*a2, but I'm having trouble...

Homework Statement I can do the math work, but I always overthink these multiple choice concepts. A block is attached to each end of a rope that passes over a pulley suspended from the ceiling. The blocks do not have the same mass. If the rope does not slip on the pulley, then at any...

Homework Statement Note: My textbook and first language is french, I am sorry if I mistranslated some terms. A friction-less rope goes around the fix pulley A. At one side of the rope, there is a mass M1. On the other side, there is a pulley of mass M2. Another friction-less rope goes...

Homework Statement Block A and B are connected by a string passing over an essentially frictionless pulley. (Block A is on a horizontal plane, while block B is suspended in the air) When the blocks are moving block A experiences a force of kinetic friction of magnitude 5.7N. If mA= 2.7kg and...