Blocks Definition and 746 Threads

Homework Statement Two blocks are connected by a rope F (Vertical in the drawing, with force F pulling on a rope, block 1 attached to that rope, then there ia another rope off the bottom of block 1 that attaches to block 2). The block starts from a rest and moves upward a distance of 3.00m in...

Homework Statement Block A (M1-5 kg) is on a horizontal surface and block B (M2-2 kg)to the left resting on a 30 degree incline. the two are connected to each other by a mass-less rope over a massless pulley and are moving down hill (to the left) at constant velocity. a) Find the...

Homework Statement Part 1 Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.03 kg, M2 = 3.40 kg, and F = 5.10 N, find the size of the contact force between the two blocks...

A 4 kg block is placed on top of a 8kg block, placed on a table with no friction,which is subject to force of 30N. What is the coefficient of friction needed between the two blocks so that the the top doesn't slide on the other one? What i did was find the acceleration of the bottom block and...

Homework Statement A 1-lb block and a 100-lb block are placed side by side at the top of a frictionless hill. Each is given a very light tap to begin their race to the bottom of the hill. In the absence of air resistance, what can you conclude about the outcome of the race? Homework...

3 blocks are hanging on pulleys: O | \ | \ M3 \ \ O | \ | \...

There's an interesting series of papers by Bahr and Dittrich, and a related video talk by Dittrich at the Planck Scale site. The papers bear on issues discussed in the Lewandowski thread. The first in the series is a good introduction to the rest. Here are some links and abstracts to show what...

Homework Statement Imagine that there is a slab (call it block 1) on top of which sits a block (call it block 2). The slab connects to a cable that passed through a pulley and attaches to another block (call it block 3), hanging freely. Assuming that the coefficient of kinetic friction is...

Homework Statement In the figure, the pulleys and the cords are light, all surfaces are frictionless, and the cords do not stretch. (a) How does the acceleration of block 1 compare with the acceleration of block 2? (Use a_2 for a2.) (b) The mass of block 2 is 1.22 kg. Find its acceleration as...

Overhang of uniform blocks?? Homework Statement If you put a uniform block at the edge of a table. the center of the hlock must be over the table for the hlock not to fall off. (a) If you stack two identical blocks at the table edge, the center of the top block must be over the bottom block...

Homework Statement Three blocks on a frictionless horizontal surface are in contact with each other as shown in Fig. 4-5. A force F is applied to block 1 (mass m1). (a) Draw a free-body diagram for eeach block. Determine (b) the acceleration of the system (in terms of m1, m2, m3), (c) the...

Does anyone know where I could download some free cad blocks for traffic arrows to be painted on a road. My company is doing a site plan for a new pizza hut and I have to alter the highway to have some turning lanes some turning arrows and strait arrows. Couldn't find any on Google...

Homework Statement Two blocks, of masses M = 2.1 kg and 2M are connected to a spring of spring constant k = 210 N/m that has one end fixed, as shown in the figure below. The horizontal surface and the pulley are frictionless, and the pulley has negligible mass. The blocks are released from...

Hi, I have a 24000x24000 sparse matrix. I want to extract 4 blocks out of it; (0,0) to (6000,6000) (6001,6001) to (12000,12000) (12001,12001) to (18000,18000) (18001,18001) to (24000,24000) By use of those my aim is to make a block diagonal matrix using MATLAB command 'blkdiag' . Can...

Homework Statement Two blocks are connected by a rope that passes over a set of pulleys. One block has a weight of 412N and the other has a weight of 908N. The rope and the pulleys are massless and there is no friction. (a) What is the acceleration of the lighter block? (b) Suppose that the...

Homework Statement A 3.0-kg block sits on top of a 5.0-kg block which is on a horizontal surface. The 5.0-kg block is pulled to the right with a force F. The coefficient of static friction between all surfaces is 0.60 and the kinetic coefficient is 0.36. a)What is the minimum value of F...

Homework Statement Three blocks are connected on a table as shown in Figure P5.50. The table is rough and has a coefficient of kinetic friction of 0.350. The pulleys are frictionless. Determine the magnitude of acceleration of each block. Determine the tension in the two cords...

Homework Statement Four blocks are on a horizontal surface. <---F2---B---Tx---A---Tz---D----Ty--C---F1--> The blocks are connected by thin strings with tensions Tx, Ty, Tz. The masses of the blocks are A=41.0 kg, B=21.0 kg, C=29.0 kg, D=39.0 kg. Two forces, F1=47.0N and F2=71.0N act on...

Homework Statement A slender rod AB of weight W is attached to blocks A and B which move freely in the guides shown. The constant of the spring is k, and the spring is unstretched when \theta = 0. (a) Neglecting the weight of the blocks, derive an equation in W, k, l, and \theta which must be...

Homework Statement What is the magnitude of force F (which is pushing from the left on M) required to keep M1 and M2 relatively at rest to M? Ignore all friction. See attached diagram Homework Equations Newton's laws The Attempt at a Solution Well...If M is at rest, M1...

Homework Statement Blocks of mass M1 and m2 (as shown in attachment) are connected by a system of frictionless pulleys by massless strings. What is the acceleration of M1? Homework Equations The Attempt at a Solution Let T1 be the tension in the first (higher) string, and T2 be...

Homework Statement A block of mass M_1 rests on a block of mass M_2 which lies on a frictionless table. The coefficient of friction between the blocks is \mu . What is the maximum horizontal force which can be applied to the lower ( M_2 ) block for the blocks to accelerate without...

Homework Statement Two blocks,connected by a string over a pulley, slide along the frictionless ramp shown in the diagram. What is the tension in the string? Homework Equations \sumF=ma The Attempt at a Solution so i set up an equation for each mass m1=3kg \frac{Fg1+Ft}{m1}=a...

Homework Statement A small block (mass m) slides down a circular path (radius R) which is cut into a large block (mass M), as shown. M rests on a table and both blocks slide without friction. The blocks are initially at rest, and m starts at the top of the path. Determine the velocity of m...

Homework Statement Two blocks are sliding to the right across a horizontal surface, as the drawing shows. In Case A the masses of both blocks are 2.2 kg. In Case B the mass of block 1, the block behind, is 7.0 kg, and the mass of block 2 is 3.5 kg. No frictional force acts on block 1 in either...

Homework Statement The horizontal surface on which the objects slide is frictionless. The acceleration of gravity is 9.8 m/s2. Three blocks are sliding on a frictionless horizontal surface: Fℓ----->[Block1-1kg][Block2-7kg][Block3-4kg]<--Fr If Fℓ = 29 N and Fr = 3 N, what is the...

Homework Statement Blocks with masses of 0.54 kg, 2.16 kg, and 2.87 kg are lined up in a row on a frictionless table. All three are pushed forward by a 13.8 N force applied to the 1 kg block. How much force does the 2.16 kg block exert on the 2.87 kg block? Homework Equations...

Homework Statement Block A of mass 2M hangs from a cord that passes over a pulley and is connected to block B of mass 3M that is free to move on a frictionless horizontal surface. The pulley is a disk with frictionless bearings, having a radius R and moment of inertia 3MR^2. Block C if mass...

Homework Statement The coefficient of kinetic friction between the two blocks is 0.30. The surface of the table and pulleys are frictionless. m1=2 kg m2=3 kg m3=10 kg Homework Equations \SigmaF=ma T2-m3g=m3a T1-T2=m2a friction-T1=m1a The Attempt at a Solution T2=m3g+m3a...

A block of wood of mass m1 = 0.15 kg slides to the right on a frictionless horizontal table with an unknown speed. It collides with a second piece of wood of mass m2 = 0.30 kg which is stationary and attached to a spring with a spring constant of k = 159.00 N/m. The two pieces of wood stick...

Homework Statement For the picture, go to http://s16.photobucket.com/albums/b21/arbilvoldy/pulley.jpg" . T1 is for the hanging string with mass m1, and T2 is for the string over the table with mass m2. Two 6.20 kg blocks are connected by a massless string over a pulley of radius 2.40 cm...

Homework Statement An 8.52g bullet is fired into a 385g block that is initially at rest at the edge of a table of h = 1.03 m height. The bullet remains in the block, and after the impact the block lands d = 2.15 m from the bottom of the table. How much time does it take the block to reach...

Homework Statement In the figure below, block 1 (mass 1.6 kg) is moving rightward at 12 m/s and block 2 (mass 4.8 kg) is moving rightward at 2.8 m/s. The surface is frictionless, and a spring with spring constant of 1100 N/m is fixed to block 2. When the blocks collide, the compression of the...

Unfortunately this is due today, I will go work on another problem and watch these boards. And its not a last minute thing, I have been working on this since it was assigned... :cry: Homework Statement The lower block in Figure P8.28 is pulled on by a rope with a tension force of F = 28 N...

Homework Statement The coefficient of static friction is 0.55 between the two blocks in Figure P8.32. The coefficient of kinetic friction between the lower block and the floor is 0.20. Force FT causes both blocks to cross a distance of 5.0 m, starting from rest. What is the least amount of...

Homework Statement We have two block of mass that rest upon each other. A force is applied to the top block and that cause both of the blocks to accelerate at different rates. What are the coefficient of friction needed to achieve this, assuming that bottom block rest on a frictionless...

Homework Statement A block of mass m1 = 2 kg rests on a table with which it has a coefficient of friction µ = 0.75. A string attached to the block passes over a pulley to a block of mass m3 = 4 kg. The pulley is a uniform disk of mass m2 = 0.5 kg and radius 15 cm. As the mass m3 falls, the...

Homework Statement Two blocks connected with a massless rope ,are being dragged by a horizontal force.suppose F= 68N, Mass1= 12 ,Mass2=18kg and coeffecient of fraction between each block and surface is 0.10. 12kg ------T--------18kg-----68N---> Find tension and magnitude of the aceleration...

Homework Statement Blocks with masses of 4.0 kg, 8.0 kg, and 9.0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 15 N force applied to the 4.0 kg block. 1.) How much force does the 8.0 kg block exert on the 9.0 kg block? 2.)How much force does the...

Homework Statement In Figure 5-50a, a constant horizontal force F->a is applied to block A, which pushes against block B with a 23.0 N force directed horizontally to the right. In Figure 5-48b, the same force is applied to block B; now block A pushes on block B with a 11.0 N force directed...

I have to prove that if n is any natural number then the decimal expansion of 1/n either terminates or repeats in blocks of numbers at most n-1 digits long. for example, 1/11 = 0.0909090909... the repeating block of numbers is 09 which is 2 digits long and 2 is less than 11. 1/7...

Two identical blocks are tied together with a string and placed along the same radius of a turntable that is spinning about its center. The inner block is 4 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the turntable and the blocks is...

Homework Statement Two blocks are connected by a very light string passing over a massless and frictionless pulley . The 20.0 N block moves 75.0 cm to the right and the 12.0 N block moves 75.0 cm downward. Find the total work done on the 20 N block if \mu _s\;=(coeff. of static...

Homework Statement In Figure 5-52, three ballot boxes are connected by cords, one of which wraps over a pulley having negligible friction on its axle and negligible mass. The masses are mA = 30.0 kg, mB = 42.0 kg, and mC = 14.0 kg. When the assembly is released from rest, (a) what is the...

I've been working through the Linear Algebra course at MITOCW. Strang doesn't go into the Jordan form much. When a matrix A is diagonalizable then A= S \Lambda S^{-1} and the matrix S can be formed from eigenvectors that correspond to the eigenvalues in \Lambda Question: how do...

Homework Statement Two blocks, A and B remain stuck together as they are pulled to the right by a force F = 200 N to the horizontal right. B is on a rough horizontal tabletop (coefficiant of kinetic friction is .800) a) what is the acceleraton of the system b) what is the force of friction...

Homework Statement Two identical blocks are tied together with a string and placed along the same radius of a turntable that is spinning about its center. The inner block is 4 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the...

Homework Statement A block of mass 3 kg pulls a block of mass 2 kg across a floor with a force of 24 N. The coefficient of friction is mew = .19. What is the tension between the blocks? Note: Acceleration = 2.936. (Solved for this earlier and was correct.) Homework Equations T =F- m1a T...

Homework Statement Two blocks on a frictionless horizontal surface are connected together by a massless string. A second massless string is attached to the block of mass m2, as shown. Suppose you pull on this second string with a horizontal force directed to the right. Determine the ratio...

Homework Statement Two blocks connected by a rope of negligible mass are being dragged by a horizontal force Fvec. Suppose Fvec = 70.0 N, m1 = 11.0 kg, m2 = 26.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.100. Determine the tension T. Diagram: [ m1 ]...