Pulleys Definition and 384 Threads

Homework Statement A particle A is suspended as shown in the figure by two strings, which pass over smooth pulleys, and are attached to particles B and C. At A, the strings are at right angles to each other, and make equal angles with the horizontal. If the mass of B is 1 kg, what are the...

Homework Statement 17. 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. A) T = W B) T = W/2 C) T = W/3 D) T = 2W E) T = 3W/2 F) T = 2W/3 G) T = W/7 H) T = W/5...

Homework Statement [/B] This is not a typical homework problem, so I hope I am posting this in the correct place. I am in 12th grade physics and we are dealing with basic kinematics. However, we recently did a set of problems that I did in a way which makes sense and which our textbook (and the...

1. Homework Statement 2. Homework Equations How to get ax=2ay? 3. The Attempt at a Solution a=10m/s2 And the solution I found was a=2m/s2 I found this at : http://www.physicstutorials.org/home/exams/dynamics-exams/142-dynamics-exam1

Homework Statement assume that the total downward force exerted at A & B by the leg is 38N. find the weight W, attached on the lower puller Homework Equations please see attached diagram The Attempt at a Solution [/B] i have written roman numerals to help determine which equation refers to...

Homework Statement The double Atwood machine has frictionless, massless pulleys and cords. Determine (a) the acceleration of masses ma, mb, and mc, and (b) the tensions Fta and Ftc in the cords. Homework Equations F=ma The Attempt at a Solution So I drew free body diagrams for the mass A...

Homework Statement Ok, so first I find the tension on the top portion of the belt.. 3.0=T(100/1000) , T-> tension T=30N , though I'm not sure if taking the diameter of Q is correct. Then I find the torques on wheel P, which I multiply the tension with the radius (150/2 mm) which I get 4.5 Nm...

Homework Statement No friction. m3=5m, m2=12m, m1=3m Prove that the system's acceleration when it's released is a=0.2g. is it the max acceleration? Show that the equilibrium point is at x0=0.75L Show that the kinetic energy of the system is E=mgL Show that m2 will stop momentarily at...

hello everyone. me and my mates as some fun over the school holidays are having a competition to see who can throw 1Kg the highest without the use of electronics due to an unfair advantage to those more well off etc. my first idea was a rail gun but as that requires electronics it is unable to...

text is same as on pic. I'm trying to express this diagram as algebraically as possible so later on I can add real world limitations into my equation and see what other requirements are needed. I got the first and simplest one which is to be in equilibrium the mass/weight of B has to be...

THIS THREAD WAS INCORRECTLY PLACED IN THE CLASSICAL PHYSICS FORUM, SO THERE IS NO TEMPLATE Hi, everyone. my teacher stuck me with these questions and i am need of a little help answering question 2. here's my answers to question 1 first. 1a) a=0, as system would be in equilibrium when F=0 b)...

Hi all, I'm new here on Physics Forums and can't wait to delve into some juicy topics! I have a very practical problem that I need help with. I am doing a home project where I want to move a platform on wheels (loaded to a maximum of 70kg) in a 1.5m long straight line across the floor at a...

Homework Statement There's a 200g piece of weight hanging by a string. That string is then split into two strings, each at θ from the horizontal and Φ from the horizontal. These two strings are each connected to force sensors which measure their tension in Newtons. I know how to do this...

Homework Statement Given that a weight m1 is attached to a string going over a perfect pulley attached to another pulley suspending weight m2, and that weight m1 is on an incline with an angle of 37 degrees, find acceleration, tension, which mass hits the ground first, time needed to hit the...

Hey! :o Fixed pulley: $$F_G \cdot r=F_z \cdot r \Rightarrow F_G=F_z$$ Only force transfer, no changement of force Movable pulley: Like one-sided lever, current center of rotation is at the circumference of the pulley: $$F_G \cdot r=F_z \cdot 2r \Rightarrow F_z=\frac{F_G}{2}$$ Could you...

Homework Statement [/B]In the drawing, the rope and the pulleys are massless, and there is no friction. Find (a) the tension in the rope and (b) the acceleration of the 10.0-kg block. (Hint: The larger mass moves twice as far as the smaller mass.) 2. Formula's Used. F = ma, W = Mg. The...

Homework Statement Consider a uniform 10-kg circular disk with diameter .4m. The disk is free to rotate about a horizontal axis through its center. A (massless) cord wrapped around the disk passes over a 2-kg pulley, P, with diameter .2m and is attached to a 25-kg mass. The pulley's mass...

1. If flat car is given an acceleration a = 3 m/s^2 starting from rest, compute tension (in N) in the light inextensible string connected to block A of mass 30 kg. Coefficient of friction between block and flat car is = 0.50. Neglect mass of pulley and its friction. Take g = 10. 2. Friction...

Homework Statement Given: T(sub-B) plus T(sub-B) prime = 36. Both T(sub-C) values are 0. T (sub-D) =36 and T (sub-D) prime = 12. Find values of T (sub-B) and T (sub-B) prime[/B]Homework Equations OK, so we need to find the wrap angle, which should be 180 + 30 -22, which comes to 188...

Homework Statement A 100 kg man dangles a 50 kg 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 be: (A) 250 N (B) 333 N (C) 500 N (D) 667 N The answer is B but I am having a difficult time setting...

Homework Statement Masses ##M_1## and ##M_2## are connected to a system of strings and pulleys as shown (I have attached an image). The strings are massless and inextensible, and the pulleys are massless and frictionless. Find the acceleration of ##M_1##. Homework Equations $$\sum_{}^{} F_y...

Homework Statement I had a set of old concrete steps, with a mass of about 2.5 metric tonnes (i.e., 2500 kg), which needed to be dragged across the yard. One way to make the job easier was to rig a block-and-tackle, which consisted of two pulleys. I used a thick rope to tie one pulley to the...

OK, struggling a little here to grasp this one. Any help guiding me in the correct direction would be welcome. 150mm diameter pulley is directly driven at 250 rev per min. A V-belt is used to transmit power from this electrically driven pulley to another, which is 400mm in diameter. The centre...

Homework Statement A light string is wrapped around a solid cylinder and a 300 g mass hangs from the free end of the string, as shown. When released, the mass falls a distance 54 cm in 3.0 s. a. Draw free-body diagrams for the block and the cylinder. b. Calculate the tension in the string...

Homework Statement Find the acceleration of both blocks Homework Equations Dynamics The Attempt at a Solution Everything in black is given in the problem. The red/blue is my work. First I want to relate the acceleration of block A to block B by finding the constraint equations: Lrope = 2L1...

Homework Statement A continuous cable of total length 4 m is wrapped around the small pulleys at A, B, C, D. If each spring is stretched 300 mm, determine the mass m of each block. Neglect the weight of the pulleys and cords. The springs are unstretched when d=2 m. The Attempt at a Solution I...

Homework Statement http://www.sumoware.com/images/temp/xziltxnrjlckqjqs.png Two blocks ( A and B ) are linked by rope through three identical pulleys C, D, and E. Pulley C and E are in stationary, while D is pulled down so its constant velocity 1 m/s If vA = 4m/s when A goes down 2 m...

Homework Statement Note that the vector F is 50N. I need to find Theta and the Mass of the Box(M). http://i5.minus.com/ib08xMuKZxTSbc.png Homework Equations What I have so far: Pulley 2: FY: T2cos(20) - T1sin(60) + Fsin(45) + T2sin(30) = 0 FX: T2sin(20) + T1cos(60) + Fcos(45) - T2cos(30) =...

Suppose there is a pulley (a disc) of mass m1 and a string passes over the pulley with masses m2 and m3 hanging on both ends of the string with m3 > m2. I know that the acceleration should be (m3 - m2)g/(1/2m1 + m2 + m3) and I know how to get there. However, since the pulley rotates and has...

1.What would be the effect of the following factor on the maximum power that can be transmitted. (give reasons for your answers) Increasing the included angle of the pulley groove. 2. What would be the effect on the following if the load torque is increased and the speed maintains constant? The...

Homework Statement A large weight hangs over the side of a building from a cable. The cable goes over a pulley to a horizontal roof and is attached to a small weight of half the mass. The coefficient of sliding friction between roof and the small weight is 0.5. What is the approximate...

Hello, I am confused about a problem regarding work done and pulleys. I am confused mainly by the last two, but not 100% confident in the first two either. 1. Homework Statement Two blocks are connected by a very light string passing over a massless and frictionless pulley (Figure 2). The...

Homework Statement A window washer pulls herself upward using the bucket-pulley apparatus shown in the figure. How hard must she pull downward to raise herself slowly at constant speed? The mass of the person plus the bucket is 71kg . Homework Equations F of gravity = mg F effort = mg/2 The...

So I have started a conundrum with a question about pulleys. There is one pulley anchored and suspended from a ceiling. There is a 100 pound weight suspended on one pulley and the other end of the rope is anchored to the ground. The question is how much weight is on the pulley? 50 pounds, 100...

Homework Statement Pulley system, attachment below. Would be impossible to explain without a diagram. Homework Equations Wa = 200N Va0=2m/s t= 2 seconds Wb= 40N μK=0.2 g=9.81m/s^2 The Attempt at a Solution Okay my attempted solution was this: For block A: 40N +...

Homework Statement A truck shown in the figure is driven with an acceleration a =3m/s2. Find the acceleration of the bodies A and B of masses 10 kg and 5 kg respectively, assuming pulleys are mass less and friction is absent everywhere. The Attempt at a Solution I have written three...

1. Homework Statement Calculate the tension in the cable connecting the two masses. Assume all surfaces are frictionless. http://tinypic.com/r/20jg36s/7 2. Homework Equations 3. The Attempt at a Solution I tried to begin the solution but came out with a negative acceleration...

Homework Statement A force F is used to raise a 4-kg mass M from the ground to a height of 5 m. What is the work done by the force F? (Note: sin60 = 0.87; cos60 = 0.5. Ignore friction and the weights of the pulleys.) A) 50 J B) 100 J C) 174 J D) 200 J...

I am designing a block and tackle system (because I can't think of anything more simple) to take up the slack in a loop of cordage for a machine I am tinkering on. The loop only travels in one direction due to a set of cam cleats. I am trying to figure out if all the pulleys in a block need...

Homework Statement This is problem 2.9 from Kleppner and Kolenkow, 2nd edition. I think I got it right, just want to check since I'm self-studying. Masses on table Two masses, ##A## and ##B##, lie on a frictionless table, as shown (see my crudely drawn figure in the thumbnail :-p). They are...

Homework Statement I am teaching myself mechanics using Kleppner & Kolenkow, second edition. My background is in math, so I don't need assistance with that aspect, but my physical intuition is weak/nonexistent. :-p This is problem 2.8. Masses ##M_1## and ##M_2## are connected to a system of...

Homework Statement Explanation: There are three masses in this problem. Two masses are sitting on two opposite surfaces. These surfaces have a space in between them, where a third mass is hanging down. These masses are connected by a continuous pulley system. μ = 0. The question asks...

Homework Statement Figure CP7.57 shows three hanging masses connected by massless strings over two massless, frictionless pulleys. a) Suppose: m1 = 2.5 kg, m2 = 1.5 kg, and m3 = 4.0 kg. Find the acceleration of each. b) The 4.0 kg mass would appear to be in equilibrium. Explain why it...

Consider the system shown in the picture. http://updata.ir/images/m9wcnahubdfanhq9edok.jpg What are its degrees of freedom? And is the Lagrangian below,the correct one for this system? \mathfrak{L}=\frac{1}{2} M_2...

Homework Statement I'm trying to do a lab and none of my data is making sense. It's making it very difficult for me to draw conclusions and make sense of the post-lab questions with the data I have. Here are the questions I am struggling with: 1. What happens to the force exerted as mechanical...

Tension and Pulleys...Cannot understand this problem So this is NOT for homework, (I'm doing practice problems reviewing for a final), but this is a textbook question that might as well be homework. This is the question: Figure 5-53 shows a man sitting in a bosun’s chair that dangles...

Homework Statement Two pulleys are mounted on fixed axles that have negligible friction. The small pulley has a moment of inertia of 9.0 kgm^2, and is made of up of two cylinders wielded together, one of radius 7.0 cm, and one of radius 15.0 cm. The large pulley has a radius of 41.0 cm, and a...

Homework Statement In the graph shown in the picture, an expression for the acceleration of the pulleys is obtained. Homework Equations The Attempt at a Solution The thing i don't understand is, how do we find the angular momentum for the system? In class, I was told that the angular...

Homework Statement http://essbaum.com/images/Pulley_diagram.png We have a bonus question where we are asked to find the mass of ##m_{1}## necessary to accelerate ##m_{2}## upward at ##1g##, and we have to include friction in the pulley bearings as well as the pulley inertias. The...

Sometimes when I see pulley and rope questions people will say "for a non-extensible rope the tension is uniform throughout the rope". But I am now learning pulleys and rotational inertia and it seems to be necessary to consider the rope on either side of a pulley to have _different_ tension if...