Blocks Definition and 746 Threads

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 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...

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...

Homework Statement A 3.2 kg wood block is launched up a wooden ramp that is inclined at a 20° angle. The block's initial speed is 8 m/s. (Use µk = 0.20 for the coefficient of kinetic friction for wood on wood.) (a) What vertical height does the block reach above its starting point? _____m...

Block A, with mass mA, is initially at rest on a horizontal floor. Block B, with mass mB, is initially at rest on the horizontal top surface of A. The coefficient of static friction between the two blocks is μs. Block A is pulled with a horizontal force. It begins to slide out from under B if...

Homework Statement Two small blocks each of mass m, are connected by a string of constant length 4h and negligible mass. Block A is placed on a smooth tabletop and block B hangs over the edge of the table. The tabletop is a distance 2h above the floor. Block B is a distance h above the...

Homework Statement Three blocks on a frictionless horizontal surface are in contact with each other. A force F is applied to block A (mass mA ). If mA=mB=mC=10.0 kg and F = 96.0 N, determine the force of contact that each block exerts on its neighbor. Homework Equations The Attempt...

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 P = 25 N. The coefficient of friction of the blocks with the floor is µ = 0.14. I found the acceleration to be 3.6266 m/s2. I need...

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 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 3 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the...

Hey guys I am having a hard time trying to solve this problem and I was hoping someone could help me out with it because to be honest I don't even have any idea how to start it. Problem: Two identical blocks are tied together with a string and placed along the same radius of a turntable...

forces act on blocks A and B, which are connected by a string. Force FA = (15 N) i acts on block A, with mass 5.0 kg. Force FB = (24 N) i acts on block B, with mass 6.0 kg. What is the tension in the string? Fa Fb -> -> [A]---[B]--> F=ma (15N+24N)=(5.0kg+6.0kg)(a)...

I think I found a bug in Flash. It spans from CS3 to MX and perhaps earlier. I did a stop motion animation of me turning the pages of a scrap book (frames of a video recording). Then I put labels on each frame where a page is completely turned and did some actionscript (gotoAndPlay) so that I...

Homework Statement Refer to diagram. Find acceleration of each block: n1,n2, n3 are coefficients of friction. if a force of 10 N acts on the middle block, find the acceleration of each. Homework Equations F=ma The Attempt at a Solution a1,a2,a3 are accelerations of bodies, taken...

This is a GRE question, but it's so basic I thought I'd just put it here. Here it is with the solution: http://grephysics.net/ans/9277/6 The answer is "D" by the way. So my problem is with the way the weight of the block is distributed. I get that each triangular block only "feels"...

Homework Statement 20: Two boxes are sitting on top of one another. The top box has a mass of 5kg and is connected to the wall by an unstretched spring, k=2000N/m. The bottom box is 10kg. the static friction coefficient between the 2 boxes is 0.5, the kinetic friction coefficient between the...

Whoops, I know i made another post but i didnt realize i have another question that i left blank: The weight of the block on a table is 452 N and that of the hanging block is 220 N. Ignore all frictional effects, and assuming the pulley to be massless. What is Acceleration of the two...

Here's the problem: http://img187.imageshack.us/img187/5958/showmenq5.gif A block of mass m1 = 1 kg rests on a table with which it has a coefficient of friction µ = 0.52. A string attached to the block passes over a pulley to a block of mass m3 = 3 kg. The pulley is a uniform disk of mass...

Homework Statement Three rectangular blocks of equal mass m slide to the right along a frictionless horizontal surface accelerated by a force F applied to the left side of the left-most block. (a) Draw a free-body diagram for each block. (b) Determine the magnitudes and directions of all of...

Hey guys, just thought id clarify what happens when an AC current passes through a diode. Say for instance the wave featured in the link below entered a diode, what would it look like once it leaves the diode? http://www.pcguide.com/ref/power/ext/z_ac.gif

[SOLVED] Two blocks - one on a table and one hanging - acceleration with friction Homework Statement h ttp://bildr.no/view/186531 that's a link to an image of the problem Block A (mass 2.25kg) rests on a table top, it is connected by a horizontal cord passing over a light , frictionless...

Homework Statement There are two blocks touching each other, block A, and block B. Block A is being pushed by a force, which in turn moves block A and B at the same time. Block A has a mass of 4kg, block B has a mass of 1kg. (so the force is pushing the larger block, which is pushing the...