Blocks Definition and 746 Threads

Homework Statement A 3.0kg block sits on top of a 5.0kg block which is on a horizontal surface. The two blocks are connected by a string; the string connects the top to the bottom with a pulley. The 5.0kg block is pulled to the right with a force. The coefficient of static friction between all...

Homework Statement Two blocks sit directly next to one another on a frictionless surface. Block 1 has a mass of 1.0 kg and block 2 has a mass of 2.0 kg. A person pushes block 1 with a force of 10.0 N. a) Determine the acceleration of the system b) Determine the force that block 1 exerts...

Homework Statement Three blocks are in contact with each other on a frictionless, horizontal surface. A horizontal force F is applied to m1. If m1= 2 kg, m2= 3 kg, m3= 4 kg, and F= 18 N, find (a) the acceleration of the blocks, (b) the resultant force on each block, and (c) the magnitude of...

A 2.4 kg block with a kinetic energy of 48 J slides on a horizontal frictionless table and collides with a second block. The second block is made of a different material and is initially at rest. The two blocks stick together and after the collision have a kinetic energy of 36 J. Find the mass...

Sort of urgent. I've been looking at this problem for days and it's due tomorrow afternoon. Homework Statement Draw a free body diagram for each of the masses. All surfaces are frictionless. The pulley is massless and frictionless. The connecting strings denoted by dotted lines are...

Homework Statement Two blocks are connected by a string as pictured in this link below http://session.masteringphysics.com/problemAsset/1176902/2/ch05.P070.jpg What is the upper block's acceleration if the coefficient of kinetic friction between the block and the table is 0.11? I am unsure of...

Homework Statement Two blocks, as shown below, are connected by a string of negligible mass passing over a pulley of radius 0.225 m and moment of inertia I. The block on the frictionless incline is moving up with a constant acceleration of 1.97 m/s2 on an angle of 35.1 degrees. m1 = 15.4...

Homework Statement An attachment with the problem specifications, HW6 - C, is attached. Here is a link in case that is easier to view. http://www.flickr.com/photos/54849943@N04/5082480364/ agravity = 32.2 ft/s2 Homework Equations \SigmaFyA = mA*aA \SigmaFxA = 0 \SigmaFyB= 0...

Homework Statement A student has two ramps, both of which are at an angle of 30o. Ramp 1 is frictionless and ramp 2 has friction. The student also has two blocks, one for each ramp. She pushes the blocks up the ramps with the same initial velocity. The block on ramp 2 only travels a...

Homework Statement In the figure, a constant external force P = 170 N is applied to a 20-kg box, which is on a rough horizontal surface. The force pushes the box a distance of 8.0 m, in a time interval of 9.0 s, and the speed changes from ν1 = 0.4 m/s to ν2 = 3.0 m/s. The work done by...

Homework Statement Three blocks are pushed up a frictionless plane that is inclined at an angle of 30 degrees with respect to the horizontal as shown below. The blocks move together with constant acceleration a = 3.0 m/s2. The masses of the blocks are: MA = MC = 1 kg, and MB = 2 kg. The next...

Homework Statement [PLAIN]http://img834.imageshack.us/img834/6920/captureqt.jpg Homework Equations f=ma The Attempt at a Solution Fsum=Fl + Fr=(m1+m2+m3)a 26+-8=(2+8+4)a a=18/14=1.28571 f=ma f=4(1.28571)=5.14268N I know this is incorrect. The force of 4kg block pushes...

1. a mass m1=5g moving to the right at a speed of 100m/s undergoes a perfectly inelastic collision with a block of wood, m2= 100g, at rest. what is the speed just after the collision? 2. if the mass and block of wood described in question #1 are parts of a ballistic pendulum of length 2m...

Homework Statement The diagram is here http://img375.imageshack.us/img375/5930/tensionproblem.png What is the tension in the cord connecting B and C? How far does A move in the first 0.250 seconds of movement assuming it does not reach the pulley? Homework Equations F=ma The...

Homework Statement In the figure the second block slides horizontally without friction while the first block falls. Use the Conservation of Energy to find the speed of the blocks after they have moved 2 meters, starting from rest. The falling block has mass 3 kg, the sliding block has mass 5...

1. Homework Statement Blocks of mass 5, 10, and 25 kg are lined up from left to right in that order on a frictionless surface so each block is touching the next one. A rightward-pointing force of magnitude 14 N is applied to the left-most block. a) What is the magnitude of the force that...

Homework Statement [PLAIN]https://wug-s.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?cc/DuPage/phys2111/fall/homework/Ch-05-Newtons-Laws/blocks_on_pulleys/12.gif In the above picture, the masses are M1 = 10 kg, M2 = 15 kg, and M3 = 25 kg. The pulleys and strings are massless, there is...

Homework Statement The suspended 2.29 kg mass on the right is moving up, the 1.3 kg mass slides down the ramp, and the suspended 7.7 kg mass on the left is moving down. There is friction between the block and the ramp. The acceleration of gravity is 9.8 m/s2 . The pulleys are massless...

Homework Statement Three blocks in contact with each other are pushed across a rough horizontal surface by a 75 N force as shown. The acceleration of gravity is 9.8 m/s2 . [PLAIN]http://img178.imageshack.us/img178/6198/007ow.png If the coefficient of kinetic friction between each of...

Homework Statement A force of 23.52 N pushes and pulls to blocks as shown in the figure below. The vertical contact surfaces between the two blocks are frictionless. The contact between the blocks and the horizontal surface has a coefficient of friction of 0.29. The acceleration of...

Homework Statement Two blocks m1= 9.4 kg and m2 = 4.9 kg are connected by a homogeneous rope that has a mass of mr = 1.42 kg. A constant vertical force, F = 184.9 N, is applied to the upper block. What is the magnitude of the acceleration of the system? What is the magnitude of the...

Homework Statement A 24 kg block with a pulley attached slides along a firctionless surface. It is connected by a massless string to a 5.3 kg block via the arrangement shown. a) Find the acceleration of the 24 kg block. b) Find the tension in the connecting string. Homework Equations...

Homework Statement A block is hanging from a rope which has another rope connected to another block underneath. The top block has a mass of 60 Kg and the bottom block has a mass of 30 Kg. Both blocks are accelerated 1.2 m/s^2 upward. What is the tension force between the two blocks? (Assume...

Homework Statement A force of 32.68 N pushes and pulls to blocks as shown in the figure below. The vertical contact surfaces between the two blocks are frictionless. The contact between the blocks and the horizontal surface has a coefficient of friction of 0.24. The acceleration of gravity...

Homework Statement Three blocks are located on a horizontal table. The coefficient of kinetic friction between the blocks and the table is 0.126. They are connected by a massless cord, as shown in the figure below, and pulled to the right. The masses of the three blocks are m1 = 3.0 kg, m2 =...

Homework Statement See attachment Homework Equations F=MA T=MA? The Attempt at a Solution M1: N1=M1gSin(32) T=M1gCos(32) Now does this work?: T=MA M1A=M1gCos(32) and that would give me the acceleration for the X-axis and i could do the same for the Y-axis and get the...

Homework Statement See attachment! Homework Equations Fk=UkN The Attempt at a Solution I can't find a way to start this problem can someone guide me please!

Homework Statement Block A starts moving downward to the left at a constant acceleration = 80mm/s2. At the same time block B moves along block A to the right at an acceleration of 120mm/s2 relative to block A. a) Determine the acceleration of block B. Answer: aB=52.5m/s2 b) Determine the...

Homework Statement In the given diagram find the accelaration of the small and large block respectively. Homework Equations The Attempt at a Solution

I work as a machinest and Mill mostly aluminum. I was wondering if the billets are Aluminum its crystalline form? Or just lots of Aluminum atoms held together by Metallic bond? thank you. Attached is a photo of Aluminum Block.

Each of 100 identical blocks sitting in a frictionless surface is connected to the next block by a massless string. The first block is pulled with a force 100 N. a) what is the tension in the string connecting block 100 to block 99 B) what is the tension in the string connecting block 50...

Homework Statement A block of mass 5.00kg rides on top of a second block of mass 10.0kg. A person attaches a string to the top block and pulls the system horizontally. Friction between the two blocks keeps the 5.00kg block from slipping off. If the coefficient of static friction is 0.350...

I am a bit confused when doing questions about 2 masses connected by a pulley system. Sometimes i get the right answer when i use just one of the masses to get the acceleration but other times i have to use both masses to get the correct acceleration. How do you know when to use just one...

Homework Statement A block with mass m1=2.00kg is on a flat surface and a block of mass m2=6.00kg is on an incline and they are connected by a massless string over a pulley in the shape of a solid disk with a radius R=0.250m and mass M=10.0kg. The angle of the incline is \Theta=30o and the...

Homework Statement A block of mass m1 = 1 kg rests on a table with which it has a coefficient of friction µ = 0.77. 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 m2 = 0.4 kg and radius 15 cm. As the mass m3 falls, the...

Homework Statement In terms of m_1, m_2, and g , find the acceleration of the first block in the figure . There is no friction anywhere in the system. http://session.masteringphysics.com/problemAsset/1038627/5/YF-05-71.jpg Homework Equations The Attempt at a Solution I know...

Many of you have done this in your past. Two magnets, one under a table, another on top of the table, and moving the one under will cause the one on top to move. Is there a material that, given the same thickness, will block this magnetic pull/repelling between the two magnets? Thanks.

I was just wondering what people thought the difference was in people who can seem to be able to understand physics faster? For example like Edward Witten, he took a lot of time off from physics to pursue other things such as political journalism. Then decided to go back to math and physics. If...

Homework Statement Blocks of mass 5, 10, and 25 kg are lined up from left to right in that order on a frictionless surface so each block is touching the next one. A rightward-pointing force of magnitude 14 N is applied to the left-most block. Homework Equations [a] What is the...

I'm a TA in an introductory course of (classical) mechanics at the university. I've been baffled for the couple two hours at this problem, taken from Resnick, Halliday & Krane (Fourth Edition in english; it's the 3rd ed. in spanish). I initially solved the problem, thinking my reasoning was...

Homework Statement Two blocks are on a frictionless track with a vertical, quarter circle, and 30 degree incline. Released from rest at point A, 1 kg smaller block 1 slides to B and makes an inelastic collision with 5 kg stationary larger block 2. The collision sents block 2 up the ramp. The...

Homework Statement Consider the setup shown below. The blocks have masses 8.2 kg and 25 kg. The pulley has mass 5.9 kg, and is a uniform disc with radius 0.25 m. Assume the pulley to be fric- tionless, but the coefficient of friction between the block and the surface is 0.28.What is the...

Homework Statement Two blocks are positioned according to the figure. Block A (80 lb) is attached to a rope as such that it doesn't slide or fall from block B (120lb). Compute the smallest value of Force to be applied on Block B for it to not move parallel to the inclined plane...

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...