Pulley Definition and 1000 Threads

for part(i) the answer is g/4 + g/2 = 3g/4 ms^-2 how to calculate the acceleration of the 9N blcok relative to the small pulley to be g/4?? Did I miss something? thank you so much!o:)

Homework Statement A 2.5 kg mass is attached to a 3.5 kg mass by a light string that passes over a friction-less pulley. The masses are released. a) What is the magnitude of the acceleration of the masses? b) What is the tension in the string? Homework Equations (I think) Ft - mg = ma The...

Homework Statement Two objects, masses 6.0 kg and 8.0 kg, are connected by a lightweight cord that passes over a massless, frictionless pulley as shown in the diagram. An upward force of 250.0 N acts on the axle of the pulley, causing the entire system to move upward (the pulley is still...

Homework Statement Hi, I am confused by this physics question and I was wondering if someone could help me out. I have a system with 2 pulleys and 3 weights. They are all held together by one string, the two weights on the outside of the two pulleys, both weighing the same, hold up the...

Can someone explain why the force P with which the man must pull on the rope to achieve an acceleration a m/s2 IS NOT (m+M)(a+g)/2 and is instead (m+M)(a+g). M+m is the combined mass of man and platform. Why does 2T-(M+m)g=(M+m)a not work here?

Homework Statement This is the simplest example: But I have to generalize with more pulley things on it. How does the pulley affect the kinetic energy of the car on the air track, and the potential energy of the block pulling the car? Homework Equations Nothing quantitative...

Homework Statement So i did a lab in school this week and i have to write a report but i am having some problems getting friction. so i have two masses a 1703 gram block and a hanger that pulls the block that has 700 grams on it. The block went a distance of 45cm in a time of .41 seconds. i...

Anyone can help me to calculate the Torque for Drive Pulley of Rolling Conveyor? The details below: - Roller Conveyor : length = 18m (speed of the belt conveyor is 2.5m / sec) - Conveyor consists of 25 roller, 1 drive pulley & 1 tail pulley - Total load of the conveyor : 5,500 kg To move...

Homework Statement http://i.imgur.com/rjxR2.jpg Homework Equations F = ma The Attempt at a Solution I know that the rope is pulling the man up twice as much because there are two points of contact between him and the rope. I'm really just looking for somebody to explain why that...

Solving a problem about a pulley system (dynamics) A 100 kg crate is supported by a rope which passes over a 25 kg pulley. A 2nd rope connects the pulley to the ceiling. The system is stationary. ƩFx=0 ƩFy=0 I am having problems setting up the free body diagram to start the problem!

Homework Statement https://docs.google.com/file/d/0B65UbG8T0LS9SEFRTHhHZmR2NDA/edit Question 2 Homework Equations The Attempt at a Solution Well I tried to draw a diagram but I don't really know where to start tbh, I also can't my head around how 1200N of force only provides 600N...

Homework Statement Objects with masses m1 = 12.0 kg and m2 = 4.00 kg are connected by a light string that passes over a frictionless pulley. If, when the system starts from rest, m2 falls 1.00 m in 1.70 s, determine the coefficient of kinetic friction between m1 and the table...

Looking at the free body diagram of a fixed pulley with a rope going over the top half, the diagram would show tension going downward on either side and an anchor going up equaling twice the tension. I understand this is this case so the pulley doesn't move in any rectilinear motion. However...

Pulley and Motor - Torque Problem Homework Statement When the motor in the figure below lowers the m = 1140kg mass, it produces a tension of 1.04E+4N in the cable on the right side of the pulley. The pulley has a moment of inertia of 79.7kgm^2 and a radius of 0.741m. The cable rides over the...

There is no friction and the strings are massless. Find Tension and acceleration. 3. The Attempt at a Solution 1. +T-m1g = m1a 2. m2g-2t= m2a 3. +T - m3g =m3a 4. 2a2 = a1+a3 g(-m1+m2-m3) + 2a2 = (m1 + m2 + m3)a + a1 + a2 -29.4 + 2a2 =11a +a1+ a2

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/s Given that the two blocks move at 5.7 m/s under an acceleration of 4 m/s^2 calculate the coefficient µk of kinetic...

Homework Statement Consider the following system: A mass 4m is suspended with a massless string from a massless pulley wheel. On the other end of the string is another massless pulley wheel with a mass 3m suspended from a massless string on it, and a mass m suspended on the other side...

Homework Statement A 45 kg boy stands on 30 kg platform suspended by a rope passing over a stationary pulley that is free to rotate. The other end of the rope is held by the boy. The masses of the rope and pulley are negligible. Ignore the friction in the pulley. a) If the rope and the...

Homework Statement A block of mass 2.6 kg (M1) lies on a frictionless surface. Its connected by a massless pulley and string hanging over the edge of the surface of 3.17 kg (M2). Calculate the acceleration of M1(part 1). calculate the tension in the cord(part 2). the cord is...

A 6.0kg box is on a frictionless 35° slope and is connected via a massless string over a massless, frictionless pulley to a hanging 2.0kg weight. What is the tension in the string if the 6.0kg box is held in place, so that it cannot move? m1= 6.0kg m2= 2.0kg θ=35° So, for Box 1 to be...

Homework Statement Two objects A and B weighing 50 N and 80 N respectively were connected by a light string over a fixed pulley. A was put on a reasonably long and horizontal table surface. The coefficient of sliding friction between A and the table surface is μ = 0.3 while the friction...

Homework Statement http://imageshack.us/a/img703/7864/physicsb.png From the image above: a) If there is no friction between A and surface, what is the blocks' acceleration? b) With coefficient of 0.2?

Homework Statement In the arrangement shown in Fig. 1.18(see attachment) the mass of ball 1 is η=1.8 times as great as that of rod 2. The length of the latter is l = 100 cm. The masses of the pulleys and the threads, as well as the friction, are negligible. The ball is set on the same level as...

Homework Statement A crate is pulled up using frictionless pulleys in the manner shown in the figure. The angle is 45 degrees. The masses are, for the small pulley, m1=3.5 kg, for the traveling pulley, M2=6.5 kg, and for the crate, MC=44.2 kg. What is the minimum tension with which the...

1. A pulley system consists of Mass A (400g) on a wooden ramp being pulled by Mass B (300g) which is suspended in the air. The board is placed on a table at an angle of 12 degrees. The following values are for the system: Hypotenuse(Length of board): 50cm, Height from table to board (a from...

http://imgur.com/NMu80 http://imgur.com/NMu80 Hello! I have a problem to solve and I am not quite sure how to. In the linked image i have the values of G, F and D given. F stays constant and right angled towards the lever. The bucket needs to go up 9 meters in 4 seconds. What is the...

If there is a load of say, mass =m Kg which is being raised on the end of a light inextensible rope by means of a winch. see attachment. the pulley of the winch has a radium x meters and is let's say that it is frictionless. the acceleration of the load is a ms^-2 can someone tell me...

Homework Statement Two weights are connected--Weight 1 (75.0N) and Weight 2 (125.0N)--by a very light flexible cord that passes over a 70.0N-frictionless pulley of radius 0.400m. The pulley is a solid uniform disk and is supported by a hook connected to the ceiling. I calculated the mass of...

Homework Statement A mass m{1} = 5kg is on a frictionless ramp and connected to a cable that passes over a pulley which is then attached to a second hanging mass, m{2} = 10kg. How long will it take the boxes to move 3m if they are released from rest? F{A}= Forces acting on hanging object...

Homework Statement Sorry guys but uploading the image didnt work so i post it on imageshack. Here is the link: http://imageshack.us/f/208/apib.jpg/ So the quastion is: In the image the pulley is a uniform cylindrical disk of mass m and radius r. The strings are massless and there...

Homework Statement At the instant shown, point P on the cable has a velocity 12 m/s, which is increasing at the rate of 6m/s^2. Determine the power input of motor M at this instant if it operates with an efficiency of 0.8. The mass of the block A is 50kg. I've attached a picture of the...

Homework Statement At the instant shown, point P on the cable has a velocity 12 m/s, which is increasing at the rate of 6m/s^2. Determine the power input of motor M at this instant if it operates with an efficiency of 0.8. The mass of the block A is 50kg. I've attached a picture of the...

Homework Statement Compound pulley with a mass (10kg) attached to outer drum R = Outer Radius (250 mm) r = Inner Radius (150 mm) Horizontal force of 250 N being applied at edge of inner drum Friction torque of 7 N m present Mass of pulley = 20 kg and it has radius of gyration of 160 mm...

Honestly I'm not sure if I've made any mistakes here, but I've been having considerable difficulty with tension problems. This is also the first pulley problem I've attempted, so I'm sure I've made a blunder or two somewhere. If someone could review what I've done so far that would be very...

A pulley is massless and frictionless. The masses 2 kg, 3 kg, and 6 kg are suspended as in the figure. (Figure Attached) What is the tension T1 in the string be- tween the two blocks on the left-hand side of the pulley? The acceleration of gravity is 9.8 m/s2 . Answer in units of N...

In the figure below, m1 = 10.5 kg and m2 = 3.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.50, and the coefficient of kinetic friction is 0.30. I've drawn the free body diagram myself and labeled it but don't know how to structure the equations and stuff...

Homework Statement A man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless, frictionless pulley and back down to the man's hand. the combined mass of the man and chair is 103.0 kg. With what force magnitude must the man pull on the rope if he is to rise...

Hi I have a question about pulley. There is fixed pulley: http://en.wikipedia.org/wiki/File:Polea-simple-fija.jpg http://en.wikipedia.org/wiki/File:Polea-simple-fija.jpg where you need to use e.g. 100N to lift 100N. There is moveable pulley: http://en.wikipedia.org/wiki/File:Pulley1a.svg...

Homework Statement -------------- I I I = string O O O = massless frictionless pulley I II I ' O " . = mass 1 : : = mass 2 " = mass 3 Find acceleration of each mass. Homework Equations F=ma conservation of...

Homework Statement These are two of the excercises where I'm supposed to calculate the mechanical advantage of the pulley systems. Excuse the crude MS paint drawings, I do not have access to a scanner or a proper camera. The red dots are where two cables connect. The Attempt at a...

Homework Statement A belt drive pulley has a mean diameter of 300mm, an angle of contact of 180° and rotates at 920 rpm. Smaller belt tension is 50 N and coefficient of friction is 0.3 Neglect centrifugal Homework Equations V=piND The Attempt at a Solution pi*(920/60)*0.3=14.45 ms...

Homework Statement A mass 4m lying on a rough horizontal table is connected by a string, passing over a pulley, to another mass 3 m hanging freely. The pulley (regarded as a disk) has mass 4 m and rotates freely about a polar axis parallel to the edge of the table. The coefficient of kinetic...

Ideal pulley and strings, no friction.The pulley and the second string don't move. I need to find the numerical value of theta, the acceleration of the two blocks and the tensions.Accelerations and tension must be given in terms of m and g.I guess 2T1=T2 T1=m2*a m1*g-T1=m1*aTo find theta I need...

Homework Statement Blocks of mass and are connected by a massless string that passes over the pulley in the figure . The pulley turns on frictionless bearings, and mass slides on a horizontal, frictionless surface. Mass is released while the blocks are at rest. Homework Equations...

Homework Statement http://img152.imageshack.us/img152/8286/imag0103l.jpg *I'm aware my free body diagram is off and that normal force should be in the left quadrant. Homework Equations F=m*aThe Attempt at a Solution Would I be correct in saying.. Fg of A = mg * sin (20) = 2kg * 9.8 * sin...

Hello, I have a doubt in this exercise because it does not relate the forces work to be done. "The system shown is at rest. Determine the amount of work must be developed to apply a downward vertical force on the sphere, so that the block come off the floor."...

Homework Statement A system consists of a pulley and two masses m1, m2 haning from it as shown in the figure. The pulley is a disk of radius R with constant mass density that has two circular hole with radius R/2. Find the angular acceleration of the pulley. Figure attached. Homework...

Homework Statement The pulley consists of two disks which are both attached to each other. The total moment of inertia is: \displaystyle I=23\times {{10}^{-4}}Kg\cdot {{m}^{2}} You also know that: \displaystyle \begin{align} & {{m}_{1}}=0.8 \\ & {{m}_{2}}=0.5Kg \\ &...

A pulley is set up on the edge of a desk. A light string connects a 10 kg block laying on the desk to a 4 kg block hanging off the pulley. The only significant friction is with the desk, and the coefficient of kinetic friction is 0.20. Use the law of conservation of energy to find the speed of...

I came up with this question while thinking about pulleys. Most textbook pulley problems involve the force on the load being equal to the load's weight so that there's no acceleration. But what if we had the following setup. There's an anchor on the ceiling and there's a heavy crate on the...