Blocks Definition and 767 Threads

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...

hi all... I have general query...this is simple i guess but is haunting me because i don't knw this... consider 3 blocks of different materials (say metal and dielectrics) which is kepy one over the other...when an em wave is passed through these structures at the first metal it will...

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 ]...

Homework Statement Homework Equations We have yet to go over this material, which kinda pisses me off, but I'm guessing that: f=ma, w=ma, g = 9.8m/s/s are important The Attempt at a Solution If somebody could point me in the right direction that would be very helpful. I...

The two blocks in the figure (Intro 1 figure) are connected by a heavy uniform rope with a mass of 4.00 kg . An upward force of 200N is applied as shown. (See attachment) I figured out the acceleration to be 3.53m/s^2 The tension at the top of the heavy rope is 120N. How would I find...

Homework Statement Three blocks rest on a frictionless, horizontal table (see figure below), with m1 = 8 kg and m3 = 15 kg. A horizontal force F = 104 N is applied to block 1, and the acceleration of all three blocks is found to be 3.2 m/s2. Homework Equations W=mg F=ma Normal...

Why do strings only have one dimension (or maybe branes have 2 dimensions)? Why aren't oscillating volumes (like a cube) used?

Hi folks, I am new to PF. First I have to apologize for the following english -- it is not my native language. I have problems in understanding the formation of the conduction and valence bands of solids: For example in III-V compound semiconductors both constituents are sp3 hybridized...

Homework Statement Small blocks, each with mass m, are clamped at the ends and at the center of a rod of length L and negligible mass. Find the formula for I Homework Equations I=MR^2 The Attempt at a Solution I=m(0.5 L)^2 + m(0.5 L)^2 I=2(0.5L)^2 m I=0.5L^2 m am i right?

Homework Statement As shown in the figure below, a wooden cube measuring 20.0 cm on each side floats in water with 90.0% of its volume submerged. Suspended by a string below the wooden cube is a metal cube. The metal cube measures 10.0 cm on each side and has a specific gravity of 6.00. a)...

Homework Statement Here's the question: Block A in the figure below has mass 1.00 kg, and block B has mass 3.00 kg. The blocks are forced together, compressing a spring S between them; then the system is released from rest on a level, frictionless surface. The spring, which has negligible...

Homework Statement m_1, v_1f m_2, v_2f m_2 = m_1 = m Homework Equations KE = .5mv^2 W = F*d spring: F= -kx pot energy = PE = -.5kx^2 The Attempt at a Solution A) K + U = .5m(v_1f)^2 + .5m(v_2f)^2 - .5kx^2 .5(.1kg)(v_1f)^2 + .5(.1kg)(v_2f)^2 -.5(100N/m)(.02m)^2 B) ...

Homework Statement no one gave correct help the first time i sent this out. if you can't do it, don't worry. a 100g granite cube slides down a 40 degree frictionless ramp. at the bottom, just as it exits onto a horizontal table, it collides with a 200 g steel cube at rest, how high above...

Homework Statement say we have a block resting on a incline of a wedge (the incline is 40 degrees). the wedge is on a scale(mass of block is .2 kg and mass of wedge is .8kg).if the block is at rest (due to to static friction) the scale would read 9.8N. but let's say we eliminate the friction...

Homework Statement Two blocks are connected by a light string passing over a pulley of radius 0.35 m and moment of inertia I. The blocks move (towards the right) with an acceleration of 1.50 m/s2 along their frictionless inclines (see the figure)...

Homework Statement http://streetrodjohn.home.comcast.net/~streetrodjohn/physics.jpg A 1-kg block is pushed against a 4-kg block on a horizontal surface of coefficient of friction 0.25, as shown in the figure. Determine the minimum force needed to ensure that the 1-kg block does not slip...

Homework Statement Three blocks of masses 10kg, 5kg, and 3.090 kg are connected by light strings that pass over frictionless pulleys as shown. The acceleration of the 5kg block is 2m/s^2 to the left, and the surfaces are rough. Find the tensions in each string and the coefficient of friction...

Homework Statement Three blocks are pulled along a frictionless surface. The masses of two of the blocks and the tensions in two of the cords are given. Find the mass of the third block (Block 2). Block 1 ------- Block 2------Block 3 ------> Block 1: m1 = 12 kg Block 2: m2 = UNKNOWN...

Homework Statement Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F_vec. (Intro 1 figure) The magnitude of the tension in the string between blocks B and C is T = 3.00 N. Assume that each block has mass m =...

A 3.5 kg block (m1) and a 1 kg block (m2) are connected by a string and are pushed across a horizontal surface by a force applied to the 1 kg block as shown below. The coefficient of kinetic friction between the blocks and the horizontal surface is 0.3. If the magnitude of vector F is 27 N...

Homework Statement Moving blocks connected by a spring Two identical 0.13 kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring whose stiffness is 225 N/m, as shown in the upper diagram. Then a constant force of 8 N to the right...

Homework Statement The two blocks are connected by a light string that passes over a frictionless pulley with a negligible mass. The 3 kg block lies on a rough horizontal surface with a constant coefficient of kinetic friction 0.1. This block is connected to a spring with spring...

This is just a problem from my midterm, and I was wondering if I did it correctly Homework Statement Weight of block B is 15kN, weight of block A is 25kN. Find force P that has to be applied to keep the system in equilibrium in tension in the cable Homework Equations \sumFx=0...

Homework Statement the force is given as F the distance pushed is given as D Homework Equations W= F*d F=ma KE = 1/2 mv^2 The Attempt at a Solution the blocks have the same kinetic energy

Homework Statement the force is given as F the distance pushed is given as DHomework Equations W= F*d F=ma KE = 1/2 mv^2The Attempt at a Solution the blocks have the same kinetic energy

Homework Statement A block of mass m1 = 2 kg and a block of mass m2 = 3 kg are tied together and are pulled from rest across the floor by a force of Fp = 25 N. The coefficient of friction of the blocks with the floor is µ = 0.3. a) What is the acceleration of the two blocks? Answer...

Blocks on Floor - I got it! Homework Statement A block of mass m1 = 2 kg and a block of mass m2 = 3 kg are tied together and are pulled from rest across the floor by a force of Fp = 25 N. The coefficient of friction of the blocks with the floor is µ = 0.3. (the blocks are being moved in the...

Homework Statement This is a problem that I am trying to help my friend with. I understand how to solve this problem the traditional way by rotating the axes of the block on the inclined plane, but then my friend asked me to show him how the answer is the same with non-rotated axes. There...

Homework Statement A cube of mass m slides down a circular path of radius r cut into a larger block of mass M. M rests on a table, and friction is ignored. Both blocks start at rest and m starts at the top of the circular path. What is the velocity v of the the small cube as it leaves the...

Homework Statement A 3.5 kg block (block A) sits on a 6.2 kg block (block B). The larger block is sitting on a horizontal frictionless table. The coefficients of friction between the blocks are static = 0.35 and kinetic = 0.22. a) Calculate the maximum horizontal force that can be...

I have tried to get this problem many different ways but still don't get it. A 1.00 kg aluminum block and a 8.00 kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle θ = 40.0°) as shown in Figure...

Homework Statement Two blocks with masses 4.00 kg and 8.00 kg are connected by a string and slide down a 30.0 degree inclined plane. The coefficient of kinetic friction between the 4.00 kg and plane is .25; that between the 8.00 kg block and the plane is .35. a) Calculate the acceleration...

Homework Statement Homework Equations f=ma The Attempt at a Solution I got the acceleration by: (f1-f2)/(m1+m2)=a Now the first two q's I just cannot figure out. 1.5*4=nope 1.5/.367347*4=nope 1.5/.367347+4=nope 4*.367347=nope 2.66667-.647059=nope......ah!

Homework Statement The coefficient of kinetic friction between the m = 2.6 kg block in Figure P8.35 and the table is 0.28. What is the acceleration of the 2.6 kg block? (The image is attached) ______m/s2 Homework Equations Fk= (Mu)(N) 2nd Law statements The Attempt at a Solution...

Newtonian mechanics problem with blocks Problem: m_{1} and m_{2} each interact with m_{3} via static friction, with the same \mu_{s}. The horizontal surface below m_{3} is frictionless. An external force F_{ext} acts on m_{1} from the left and the entire system of three connected masses...

Homework Statement Two masses are connected by a string which passes over a frictionless, massless pulley. One mass hangs vertically and one slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction 0.2. The vertically hanging mass is 4.0 kg and the mass on...