Blocks Definition and 767 Threads

Homework Statement Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F_vec. The magnitude of the tension in the string between blocks B and C is T = 3.00 {\rm N}. Assume that each block has mass m = 0.400 {\rm kg}...

Homework Statement Four blocks are on a frictionless horizontal surface. The blocks are connected by massless strings with tensions Ta, Tb, and Tc. Calculate the tension Tc. Answer in units of N. Homework Equations F = ma Fn = mg The Attempt at a Solution Tc1 = 25N Tc2 = 35N

Homework Statement The coefficient of static friction between block A and a horizontal floor is 0.45 and the coefficient of static friction between block B and the floor is 0.30. The mass of each block is 2.0 kg and they are connected together by a cord. What is the tension in the cord...

Homework Statement A block of mass 1.2 kg rests on top of another block of mass 1.8 kg, which rests on a frictionless surface. The coefficient of static friction between the blocks is mu_s = 0.3. (a) What is the maximum horizontal force that can be applied to the upper block so that the...

here is the problem: http://i45.tinypic.com/xgi3qd.jpg I don't know how to solve it.

Homework Statement Blocks A, B, and C are placed as in the figure and connected by ropes of negligible mass. Both A and B weigh 24.9N each, and the coefficient of kinetic friction between each block and the surface is 0.39. Block C descends with constant velocity. a) Find the tension in the...

Homework Statement Block A (mass 2.25 kg) rests on a tabletop. It is connected by a horizontal cord passing over a frictionless pulley to a hanging block B (mass 1.30 kg.) The coefficient of kinetic friction between block A and the table is 0.450. After the blocks are released from rest, find...

Hi all, I'm studying my mathematics lesson, and there is an example I can't understand: Consider the matrix A=(0 In) (-In 0) with In the identity nxn We want to compute detA : We introduce the permutation p=(1 2 ... n n+1 ... 2n)...

Homework Statement There are two blocks, the bottom block with a mass of 2kg and a block with mass of 1 kg stacked on top of it. Block on bottom is being pulled to the right by a tension force of 20 N. The top block is connected to the left wall by a rope. The coefficients of kinetic...

Problem: I've been assigned a problem that involves a block on a table that is attached by a string to a block hanging over the edge. They are of different masses, and I am given coefficients for both static and kinetic friction. The former is .50, and the latter is .30. I have to find the...

Hey, I'm just a tad confused about tension and how it works... Homework Statement Two blocks m1 (11 kg) and m2 (18 kg) are connected by strings, as shown in the below. String 2 breaks when T2 = 4.9033 N. Find T1 when string 2 breaks. Answer in units of N. (Blocks are on a flat surface, not...

Homework Statement Two blocks attached by a string (see figure) slide down a 20° incline. Block 1 has mass m1 = 0.65 kg and block 2 has mass m2 = 0.30 kg. In addition, the kinetic coefficients of friction between the blocks and the incline are 0.30 for block 1 and 0.20 for block 2. (a) Find...

1. Homework Statement A block of mass m1 = 280 g is at rest on a plane that makes an angle θ = 30° above the horizontal. The coefficient of kinetic friction between the block and the plane is μk = 0.10. The block is attached to a second block of mass m2 = 220 g that hangs freely by a string...

Homework Statement A block of mass m1 = 280 g is at rest on a plane that makes an angle θ = 30° above the horizontal. The coefficient of kinetic friction between the block and the plane is μk = 0.10. The block is attached to a second block of mass m2 = 220 g that hangs freely by a string that...

Homework Statement 2 blocks are connected with wire each on its own angle area. Body 1 (B1) has weight 900N, angle 30, µ = 0,35 B2 wight = 1100N, angle 45 and µ=0.30 There is no friction on at the T ( picture ) How big F has to be to pull block1 down following shown path? Homework...

2 really tricky ones for me on this homework assignment. I think I got the other one settled (Thanks to help here) -- now I just need to finish this last one. Homework Statement Two blocks sit on this frictionless table, but there is friction between the blocks. Static = .589 Kinetic =...

Homework Statement Two blocks of mass m1 = 1kg and m2 = 2kg, connected through a rope, slide across an inclined plane with inclination of \theta = \frac{\pi}{6} The friction coefficient equals 0.5 3.1 Calculate the total work done by the friction force that acts on the first block after it...

Homework Statement Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane and the other is hanging over the top edge of the plane. the hanging block has a mass of 16 kg and the one on the plane has a mass of 8 kg. the coefficient...

Homework Statement Two 2kg blocks are joined by a massless cord and pulley, ignoring friction, determine each block's acceleration using a free body diagram for each. Picture for visual aid: http://img27.imageshack.us/img27/2653/86460048.png or a link...

hello Capacitors are widely used in electronic circuits to block the flow of direct current while allowing alternating current to pass,how it does the job? samieee

Do I have this right? When looking at images of ancient ruins, such as at http://www.mccullagh.org/photo/1ds-4/roman-city-ruins-dougga, I was left wondering where the debris has gone to. What I gather from reading various articles is that these missing walls of marble and stone were largely...

Homework Statement A block of mass 4.0 kg is put on top of a block of mass M = 6.0 kg. To cause the top block to slip on the bottom one, while the bottom one is held fixed, a horizontal force of at least 19 N must be applied to the top block. The assembly of blocks is now placed on a...

Homework Statement Two blocks of mass m1=80 kg and m2=100 kg and attached by a string, another sting comes off of mass m1 and is pulled horizontally (kinda looks like this) (T1 & T2 are tensions) m2--T2--m1--T1--> there is a coefficient of friction u=.14 for both blocks, what is the tension...

Der is 2 rectangle blocks of ice at a temp of -6. One is placed on top of the other. ie they are frozen together and they are not perfectly flush. And object is placed inside the top block. I have 2 calculate when this object hits the ground. My question is will the top block slide off at some...

Homework Statement A large block of mass M = 6kg is on an incline which is at an angle of 30 degrees above the horizontal. The coefficient of kinetic friction between the block and the incline is 0.3. The block is attached to a string which runs over a pulley and is connected to a smaller...

is it possible to have a material block high wavelength waves but not low length waves? Gamma rays can pass through objects that visible light cannot. Any thoughts? I was thinking a certain bandgap?

I need to move a block of steel 1.5 inches vertically, and another piece horizontally 3 inches. I was thinking magnetics. Are hydraulics viable? What else could work?

Homework Statement There is a string hanging down with a 2 kg block attached, at the bottom of this block is another string attached holding another 2 kg block. This has begun to accelerate. The given time is .7 s for acceleration, and the given velocity it reaches is .35. I have to find the...

Homework Statement A nano particle consisting of four iron atoms (object 1) initially has 1 quantum of energy. It is brought into contact with another nano particle, consisting of two iron atoms (object 2), which has 2 quanta of energy. The mass of one mole of iron is 56 gram. a...

Homework Statement A block with mass M rests on a frictionless surface and is connected to a horizontal spring of force constant k, the other end of which is attached to a wall. A second block with mass m rests on top of the first block. The coefficient of static friction between the blocks is...

Homework Statement Two 3.0 kg blocks on a level frictionless surface are connected by a spring with spring constant 1000 N/m. The left block is pushed by a horizonal force F to the right. At time t=0 seconds, both blocks are moving with velocity 3.2 m/s to the right. For the next second, the...

Homework Statement A 2kg block sits on a 4kg block that is on a frictioness table. The coefficients of friction between the blocks are U(s)= .3, U(k)=.2 a. What is the max horizontal force that can be applied to the 4 kg block if the 2 g block is not to slip? Homework Equations Fr =...

pulley, blocks, moment of inertia... :S Two blocks are connected by a light string passing over a pulley of radius 0.20m and moment of inertia I. The blocks move (towards the right) with an acceleration of 1.00m/s^2 along their frictionless inclines . Mass A is on an incline of 32 degrees...

Homework Statement The given diagram is an inclined plane with a 15 degree angle. There are three boxes, A, B, and C all weighing 4 kg. The three packages are touching, but B is in the middle and larger than A and C, which are the same size. The coefficients of friction for A and C are...

Homework Statement Two blocks (m1 = 0.02 kg, m2 = 0.03 kg, v1 = 1.5 m/s, v2 = 0.5 m/s) are sliding without friction on a surface. They are approaching each other at angle θ = 60º. In what direction and with how much velocity do we have to push the third block (m3 = 0.05 kg) against the first...

Homework Statement Two blocks (m1 = 0.02 kg, m2 = 0.03 kg, v1 = 1.5 m/s, v2 = 0.5 m/s) are sliding without friction on a surface. They are approaching each other at angle θ = 60º. In what direction and with how much velocity do we have to push the third block (m3 = 0.05 kg) against the first...

Homework Statement A block of mass m1 = 3 kg rests on a table with which it has a coefficient of friction µ = 0.54. A string attached to the block passes over a pulley to a block of mass m3 = 5 kg. The pulley is a uniform disk of mass m2 = 0.4 kg and radius 15 cm. As the mass m3 falls, the...

So I was helping my girlfriend with this problem and we are convinced we are correct, but her professor disagrees. So I am taking it to PF court :smile: Homework Statement In the figure, all 3 blocks have the same mass. A force pulls the system along the frictionless floor and the 3...

Homework Statement A bullet with a mass of 6.30 g is fired horizontally at two blocks resting on a smooth and frictionless table top as shown in the Figure. The bullet passes through the first 1.95 kg block, and embeds itself in a second 2.00 kg block. Speeds v1 = 2.50 m/s and v2 = 3.40 m/s...

Homework Statement "Blocks A, B, and C are placed as in the figure and connected by ropes of neligible mass. Both A and B weigh 25.0 N each, and the coefficient of kinetic friction between each block and the surface is 0.35. Block C descends with constant velocity. a) Draw separate free body...

Homework Statement The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.20 kg. The distances in the figure (which is not to scale) are: D1 = 7.5 cm, D2 = 6.0 cm, and D3 = 5.0 cm. The mass of block X is 0.97 kg and the mass of block Y is 1.89 kg. Determine what...

This was a problem on an exam I had the other day and I want to know if my attempt was correct. Homework Statement Please look at the attached image. You have a system of two ideal pulleys set up on a table. Block A is hanging from a string on the left side of the table which passes by a...

Homework Statement In the figure below, block 1 (mass 1.6 kg) is moving rightward at 8 m/s and block 2 (mass 4.2 kg) is moving rightward at 2.8 m/s. The surface is frictionless, and a spring with spring constant of 1120 N/m is fixed to block 2. When the blocks collide, the compression of the...

Homework Statement a 3.4 kg block A and 6.0 kg block Bvec are connected by a string of negligable mass. Force FA = (12 N) acts on block A; force FB = (24 N) acts on block B. What is the tension in the string? http://img25.imageshack.us/img25/2610/imagepn.jpg Homework Equations F=ma...

Homework Statement A light spring with k=3.85 N/m and x = 8.00cm is held between a 0.250kg block on the left and a 0.500kg block on the right. The spring exerts a force on each block tending to push them apart. The blocks are simultaneously released from rest. Find the acceleration with...

blocks A and B have weights of 45 N and 25 N, respectively. block A is sitting on a table and block B is attached to block A by a piece of string on a frictionless pulley and block B is hanging off the table. also block C is on top of block A Figure 6-48 (a) Determine the...

Homework Statement There is no friction Part A) Find the mass of block C so that block B moves up the incline with a constant speed Part B) fint he mass of block C so that Block B moves up the incline with a constant accleration a = g/2 Homework Equations The Attempt at a...

Homework Statement a mass m is supported as shown in the figure by ideal strings connected to a rigid wall and to tal mass 3m sitting on a horizontal surface. what is the minimum coefficient of static friction between the larger mass and the surface that permits the system to remain in...

Homework Statement Two blocks connected by a string are pulled across a rough horizontal surface by a force applied to one of the blocks. The acceleration of gravity is 9.8 m/s2 . 1st block = 2 kg 2nd block = 8 kg Force on second block at 52◦ μ = 0.29 [ 2kg ]-------[ 8kg ]/ 52 degrees If each...

Homework Statement Two blocks are pushed down on a spring with 75J of elastic potential energy. The spring is released and the blocks are allowed to fly freely (not sure I translated this sentence correctly, maybe separately instead of freely). Block A has a mass of 2 kg, block B has a mass...