Two masses Definition and 249 Threads

Homework Statement A string through an ideal pulley connects two blocks, one (mass=2m) is on an inclined plane with angle theta to horizontal and coefficient of kinetic friction mu. The other block (mass=m) hangs off the pulley on the high side of the inclined plane. (looks like this, except...

Homework Statement A 13,000-kg helicopter accelerates upward at 0.37 m/s^2 while lifting a 2000 pound car. To the nearest Newton, what is the lift force exerted by the air on the rotors? Homework Equations I thought since the problem is dealing with forces, I would use F=ma but that...

Homework Statement Two blocks of masses 2kg (a) and 3kg (b) rest on a smooth horizontal surface and are connected by a taut string of negligible mass. A force of 10 N is applied to the 3kg mass as shown in figure (below). Calculate the tension in the string between them. The answer is 4N...

Homework Statement hi, I am really stuck on this question: Two masses m and M, M>m are joined by a massless inelastic string and suspended from a pulley of radius R and moment of inertia I. the pulley rotates about its centre freely with no friction. The system starts at t=0 from rest...

Hi, how would i go about finding/resolving forces on an inclined plane with one mass on top of another? Friction is neglected between the mass and the plane. But you need to find the minimum allowable coefficient of friction between the two blocks. the incline is at 30 degrees block a on...

I am studying the problem of two masses, m1 and m2 (not equal) attached by a spring of spring constant k on a frictionless surface set into oscillatory motion (unstretched spring is of length l, x1 < x2). When I first attacked this problem, I let the origin be the center of mass, calculated the...

I am not posting this in the homework section because it is not really a homework problem. Its from the schaum outline and I am stumped in this: http://img379.imageshack.us/img379/688/67356569.jpg I have NO idea about 3.2.4 and 3.2.5. Its black magic! How the hell does that substitution work...

applying Newtons laws on an inclined surface with two masses Homework Statement Two blocks connected by a cord passing over a small, frictionless pulley rest on frictionless planes (diagram attached) a) which way will the system move when the blocks are released from rest? b) what is the...

Homework Statement Two masses sit on a horizontal surface and are connected by spring with known spring constant k. There is a known coefficient of kinetic friction µ_k for both blocks. The masses are brought together so that the spring is compressed by an amount Δx and then released. Find the...

Homework Statement In the attachment there is a drawing of the situation. Mass one = 4kg and Mass two = 5kg The coefficient of friction between mass one and the inclined plane = 0.24 Find the magnitude of the acceleration of the masses and the tension in the cord. Homework Equations Fk=...

This has been driving me crazy because I thought I knew what I was doing, but the book says I'm wrong. I even worked backwards the answer in the book and it makes no sense to me. Please work this out and tell me what I'm doing wrong. Homework Statement A block of mass m1 = 250g is at rest on...

Homework Statement There is a 1.0 kg block on the left connected by a cord to a 2.5kg block on the right. If this is being pulled from the right by a 50n force. What is the tension on the cord connecting the two masses. There is also a small 2.0kg block in front of the 1.0 kg block that...

Homework Statement A block of mass M1 = 13.6 kg and initial velocity v0 = 4.7 m/s collides with a block of mass M2 = 4.4 kg and initial velocity of -4.7 m/s. Attached to M2 is a spring with a force constant k = 10000 N/m. At one point the velocities of block M1 and block M2 are equal. What is...

this problem came up in my mcat physics prep book. two masses, one twice as massive as the other, are placed on a platform atop a spring. when they're launched, what height do they achieve? i know they reach the same height, and from a previously archived thread on this board, i understand...

Two masses are being pulled up a 30 degree incline by a force F parallel to the incline. The velocity is constant and up the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.2. The force F = ? So I...

1. A slab of mass 40 kg rest on a frictionless floor, and a block of mass 10kg rest on top of the slab. Between block and slab, the coefficient of static friction is 0.6, and the coefficient for kinetic friction is 0.4. The block is pulled by a horizontal force (to the right) of magnitude...

http://img158.imageshack.us/img158/6946/blockspringcy2.gif A block of mass 10 kg hangs on a spring. When a second block with an identical mass of 10 kg is tied to the first, the spring stretches an additional ho = 1.3 m. a) What is the value of the spring constant k? Now the string is...

in a head-on elastic collision between two masses, one of which is stationary, a experimenter would like the incident mass to lose quarter of its kinetic energy in the collision. What must be the ratio of the masses of the two objects for this to be the case?

Homework Statement Two blocks are connected by a rope that passes around two pulleys as indicated in the figure. (Attached) a. Determine the tension in the rope. b. Determine the acceleration of each block (Hint: The two blocks do not have the same acceleration). The Attempt at a Solution I...

Two masses are connecte by a ligh string over a light, frictionless pulley the table surface that m2 is on is also frictionless. Apply the work-energy theorem for this system to calculate the speed of the masses after the masses have moved a distance delta x starting from rest. Note that the...

Homework Statement A mass M_1 is suspended by a spring with constant k_1. A second mass M_2 is suspended from the first by a spring with constant k_2. The equilibrium height of the first is y_1 and the equilibrium height of the second is y_2. I just want to write down the Lagrangian for...

Let me start off by saying I'm new here and I hope I did this in the format. Thank you. Homework Statement Two masses, M1= 35.0 kg and M2= 38.0 kg, are connected by a rope that hangs over a pulley. The pulley is a uniform cylinder of radius 0.381 m and mass 3.5 kg. Initially M1 is on...

I have been wondering for a long time now on how to calculate the time taken for two masses in space to collide by force of gravity. Now what I've basically done was integrate the formula a = GM / R^2 between the two points corresponding to the distances appart from the masses (assuming the...

Homework Statement Two boxes, with masses 12.5 kg and 25.5 kg, are connected by a taut string on a surface that is inclined at 25 degrees with respect to the horizontal. If the coefficients of kinetic friction between the boxes and the table are 0.100 and 0.150 respectively and the 25.5 kg box...

[SOLVED] Two masses connected by string on a cliff... This is a general question about physics...and I'm a little confused about it.. Two equal masses (A and B) are attaced by a massless string of length L. Mass A is on a cliff and is L/2 away from the edge. Mass B is being held even...

Homework Statement Block 1, of mass m1 = 0.700kg , is connected over an ideal (massless and frictionless) pulley to block 2, of mass m2. Assume that the blocks accelerate downword with an acceleration of magnitude = 0.250m/s^2 and that the coefficient of kinetic friction between block 2...

Hi, perhaps a similar thread already exists, but I was not able to find it... Homework Statement Two masses m_1 and m_2 are connected by a spring with spring constant D. This setup is attached to the ceiling by a rope. We cut the rope. What happens? Homework Equations The center of mass...

Homework Statement Two boxes with different masses M1 = 1.3 kg and M2 = 2.2 kg are tied together on a frictionless ramp surface which makes an angle = 29° with the horizontal (see the figure below). (the figure is essentially two boxes tied together by a rope and then another rope tying the...

Homework Statement A block of mass m resting on a 20 degree slope. The block has coefficients of friction mu_s =0.80 and mu_k =0.50 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass 2.0 kg. What is the minimum mass m that...

Homework Statement We attach two blocks of masses m1 = 10 kg and m2 = 4 kg to either end of a spring of spring constant k = 4 N/m and set them into oscillation. Calculate the angular frequency ω of the oscillation Homework Equations M_{1}{x}^{..}=k(w-x) M_{2}{w}^{..}=-k(w-x) where x...

When I clap my hands, the electrons or the nucleus on my hands are not touching each other, right? The protons on both the hands need to repel, and same thing with the electrons. If my hands (or anything in the universe, unless tremendous force is applied on them) are not touching each other...

Two masses m_A and m_B are connected by a string of length l and lie on a frcitionless table. the system is twirled and released with m_A instantatneously at rest, and m_B moving with instantatneously velocity v0at right angles to the line of centres. find the subsequent motion of the system...

Homework Statement Two masses A and B, and of mass 1.6kg and 2.4kg respectively are connected by a light string which passes over a frictionless pulley. Calculate the acceleration of the 1.6kg mass.Homework Equations The Attempt at a Solution To get started I must know whether the two masses...

Hello, apologize if this is basic for some of you. Its been a while since I've taken physics and I'm looking to model an interaction similar to the dual ships in the classic video game Space Duel. Basicly two masses connected by a rigid connector (constant distance). One mass (m1) does all...

The pulley in Figure P8.59 has a moment of inertia of 6.0 kgm2 and a radius of 0.50 m. The cord supporting the masses m1 and m2 does not slip, and the axle is frictionless. Find the acceleration of each mass when m1 = 2.9 kg and m2 = 5.3 kg. Im not sure how to get started. What I did was...

Hey! this is my first post here, and I apologize if it is in the incorrect forum, but I have been banging my head against the wall over this concept and I can't seem to find a straight answer. It concerns gyroscopes. The question is, can two counter-rotating masses on a common spindle...

i would like to discuss the following two scenarios Scenario 1)Mass A(velocity>0) moves towards Mass B(velocity=) and hits it. The final velocity is derived from applying the momentum conservation principle. 2)Scenario 2) The scenario is same as in scenario 1) but a spring is included in...

I've come across the following problem: Two otherwise isolated, equal masses m are at rest and connected by a spring with constant k. An impulse is applied to one of the masses along the direction of the spring connecting them. What happens? Qualitatively, I think that the force will both...

Block 1, of mass m1, is connected over an ideal (massless and frictionless) pulley to block 2, of mass m2, as shown. Assume that the blocks accelerate as shown with an acceleration of magnitude a and that the coefficient of kinetic friction between block 2 and the plane is mu. Find the...

I have a general question about how to apply Newton's Second Law. When we write Fnet=ma, I am sometimes unsure of myself what the 'm' is in the problem. For instance, when two masses (m1 and m2) are connected by a pulley is 'm' equal to m1+m2, or just the mass of interest? How can I be...

Two masses m1=100g and m2=200g slide freely in a horizontal frictionless track and are connected by a spring whose force constant is k=.5N/m. FInd the frequency of oscillatory motion for this system. I don't really know how to go about this problem. I'm assuming that the equation to find...

This is a strange question and I am stumped how to solve it Objects A and B are placed on a spring, object A has twice as much mass as object B. If the spring is depressed and released, how high will object A go compared to object B? (the masses are both on the spring at once, and when...

there are two masses connected by a string: 1kg-----2kg---->F the 2 masses are being pulled by a force of F what is the tesion between the two masses? the total acceleration is a=F/3 this means that the tesion is either 2kg*F/3 or 1kg*F/3 not sure which one?

how to differentiate between the two masses in equation for relativistic mass? m= mo/sqroot 1-v^2/c^2 what's the difference between m and mo? and what about for energy: eo and e?

so frikin confused tried too many times, can anyone help me out? *image attached* Block 1, of mass m_1, is connected over an ideal (massless and frictionless) pulley to block 2, of mass m_2, as shown. Assume that the blocks accelerate as shown with an acceleration of magnitude a and that...

Hi, I need to know where I can find information on the web so as to analytically solve the system on the attached jpg where: m1, m2 are the values of each mass v1, v2 are the speeds of each mass K1, K2 are the stiffness coefficient of each spring L1, L2 are the lenghts of each spring...

A point mass of 3.8kg is on the x-axis at x=8.2 and an equal point mass is on the y-axis at y=5.9. What is the magnitude of the gravitational field from these two masses at the origin? Well for this problem I tried using the equation F= G m1 m2/ r^2 for r I added 8.2 and 5.9 for G I...

Here is the situation: There is a spring connected to a wall at one end and a mass m1 at the other, which in turn is connected to another spring, which is connected to mass m2, which is connected to another spring which is connected to another wall. In other words: Wall ----- m1 ----- m2...

2 man, mass m1 and m2 stands on a boat mass M at L distance apart on static water. they slowly swop their places. find the distance the boat move due to this. ------------------------------------------------------------ i know that the centre of mass remains unchange, and at start...