Block Definition and 998 Threads

Homework Statement A small block of mass 0.8 kg is launched by a compressed spring with force constant k=400 N/m. The initial compression of the spring is 0.12 m. The block slides along a horizontal frictionless surface and then up an inclined plane that makes an angle θ=30° with the...

1. Two blocks are connected by a light string that passes over a frictionless pulley as in the figure. The block of mass 8.24 kg lies on a horizontal surface and is connected to a spring of force constant 335 N/m. The system is released from rest when the spring is unstretched. If the hanging...

Homework Statement This is a 2 part question. A block of mass m rests on a frictionless wedge that has an inclination of theta and mass M. a) Find the acceleration of the wedge M to the right such that the block m remains stationary relative to the wedge. c) You now find out that a force...

1. A 9 kg block is pushed by an external force against a spring with spring constant 118 N/m until the spring is compressed by 2.1 m from its uncompressed length (x= 0). The block rests on a horizontal plane that has a coefficient of kinetic friction of 0.67 but is NOT attached to the spring...

Homework Statement A 2.25g bullet embeds itsself in a 1.50kg block, which is attached to a spring of force constant 785N/m. If the max compression of the spring is 5.88cm, find the initial speed of the bullet and the time for the bullet block system to come to rest. The speed comes out to...

Homework Statement A block has a density of 8.90 g/cm^3 and has an apparent mass of 120g in water and 116g when submerged in a liquid. What is the density of the liquid?Homework Equations m/(m-mapparent) = p/pliquidThe Attempt at a Solution Nevermind.

Homework Statement A block of mass 2 kg starts from rest and begins to move at time t=0 along a straight line on a smooth horizontal surface. The displacement of the block, s, depends on time, t, given by s=3+2t+t^3 . t is expressed in second and s in meter. Calculate the average force acting...

1. The magnitude of the vectors F is 18 N, the force on the right is applied at an angle 63◦ and the the mass of the block is 35 kg. If the surface is frictionless, what is the magnitude of the resulting acceleration? Homework Equations F=ma The Attempt at a Solution so they are...

Homework Statement A 20.0 kg block rests on a frictionless inclined plane of slope angle 30.0 degrees. A light cord attached to the block passes over a frictionlesss pulley at the top of the plane and is attached to a second block. What must be mass of the second block if the system is to be...

Homework Statement A spring with spring constant 200 N/m is suspended vertically with its upper end fixed to the ceiling and its lower end at position y = 0. A block of weight 20 N is attached to the lower end, held still for a moment, and then released. How far will the block move before...

Homework Statement Two bars connected by a weightless spring of stiffness ##k## and length (in the non-deformed state) ##\ell_o## rest on a horizontal plane. A constant horizontal force ##F## starts acting on one of the bars as shown in the figure. Find the maximum and minimum distance between...

Homework Statement In the figure a block of mass 'm' is placed on a wedge of mass M. The wedge is subject to a horizontal force 'F' and slides on a friction less surface. The coefficient of static friction between the block and wedge is μs. Find the range of values of 'F' for which the block...

Can anyone help me out with this? Here's the question 1. Homework Statement A 2.2 kg block sits on top of an even bigger 3.2 kg block. The coefficient of kinetic friction between the two blocks is 0.25. The coefficient of static friction between the 3.2kg block and the floor is 0.32 Find the...

Hello friends, I noticed from Wikipedia the following information: Atomic radii: 4th period(only d-block elements): Sc:160 pm Ti : 140 pm V : 135 pm...

Hi guys, I know this is a simple question. But when an artery is blocked it is easier to understand because, less oxygen goes to tissue so, necrosis of tissue. But when a vein is blocked, only the draining is affected, the arteries are still able to supply oxygen, but why does necrosis still...

When welder are working on pipelines, they use filters that block out UV light. Why is this precaution necessary? Does the question mean that they wear some type of glasses to help protect their eyes? or does the filter block UV light from going into the pipeline? This is what I...

Homework Statement I have to find the percentage uncertainty of a wooden block for its volume and density. Using 3 different types of measurements for length, width, and height. Let's say that this is my data (cm): Instrument 1: L= 1.1 W= 1.1 H= 1.3 V=1.573 Instrument 2: L= 1.13 W= 1.13...

Question: A block of 0.5kg is pulled up an inclined plane by a tensile force at a constant velocity of 2m/s. Said block is pulled 15m up the incline. Sin(theta) = 1/3. The coefficient of kinetic direction is 0.08. Calculate the work done on the bock. Also, calculate the power applied to the...

Hey! I found this interesting theorem in a textbook, but I was unable to find a proof for it neither in the web nor on my own Homework Statement The rank of a block triangular matrix is at least and can be greater than the triangular blocks. proof? specificaly, look here: pp. 25...

Homework Statement Homework Equations Conservation of energy The Attempt at a Solution All I'm thinking for this problem is to just use conservation of energy, since the cube is frictionless and it is just sliding down the wedge, aren't the only forces that are at play is just...

Hi folks! I've encountered the matrix below and I'm curious about its properties; R= \begin{pmatrix} 0 & N-S\\ N+S & 0 \end{pmatrix} where R, N and S are real matrices, R is 2n by 2n, N is n by n symmetric and S is n by n skew-symmetric. Clearly R is symmetric so the...

Homework Statement Homework Equations The Attempt at a Solution As air is gradually removed from one box, the fringe pattern shifts towards that box. Hence total number of maximas that pass through the central is calculated. However, according to...

Homework Statement Determine the acceleration a of the initially stationary 15-kg body when the 33-N force P is applied as shown. The small wheels at B are ideal, and the feet at A are small. I have attached an image of the problem Homework Equations The Attempt at a Solution...

Homework Statement A uniform rectangular block of length 37.0 cm is placed so that its centre of mass is a distance of 1.50 cm away from the edge of the table. Since its centre of mass is still over the table (i.e. not sticking out past the edge), the block is stable. An identical block is...

Homework Statement There is a small block of steel with mass 2.4kg and is firmly attached to a low mass wheel a distance .3m from its center. The wheel is free to rotate about a vertical axis and is at rest. A .0023kg bullet traveling with an initial speed of 305m/s in the horizontal plane...

Homework Statement This thing was a part of an entire question . I solved the other parts but I don't know why I am messing up here . Force required to keep a wooden block from sliding on a rough incline with coefficient of friction μ Homework Equations Force on a block on an...

Homework Statement A 10.0-g bullet traveling at 200 m/s strikes a fixed wooden block. The bullet comes to rest 22 cm inside the block. The magnitude of the force exerted on the bullet by the block over its 22-cm travel is shown in graph. Find the value of Fmax...

Here is the question: Here is a link to the question: What is the Jordan Canonical form of -J(lambda)? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

I'm sure you guys have never answered a physics question involving two blocks before :P My question is regarding parts (b) and, by extension, (c). For part (a), I called the force between the two blocks 'z' and solved \frac{F - z}{m1} = \frac{z}{m2} which gave me z = 1.1N, which was...

Hello All, I was trying to prove that an operator T in a real vector space V has an upper block triangular matrix with each block being 1 X 1 or 2 X 2 and without using induction. The procedure which i followed was : We already know that an operator in a real vector space has either a one...

1. A 3kg block slides down a rough plane inclined at an angle of 27 degrees. If the acceleration of the block is 2.5 m/s/s find the coefficient of kinetic friction. 2. solving for components Force Net = M x A forces in the y direction: Fn - Fg cos 27 degrees = 0 forces in the x...

1. An .8kg block is held in place against the spring by a 67 N horizontal external force. The external force is removed, and the block is projected with a v1=1.2. upon separation for the spring. The block then descends a ramp and has a velocity v2=1.9 m/s at the bottom. The track is frictionless...

Homework Statement A block of mass m is at rest at the origin at t=0. It is pushed with constant force F_0 from x=0 to x=L across a horizontal surface whose coefficient of kinetic friction is \mu_k=\mu_0(1-x/L). That is, the coefficient of friction decreases from \mu_0 at x=0 to zero at x=L...

Homework Statement A 2kg block is resting on a frictionless table. It is hit, head on, by a 1kg block heading at 4 m/s. The larger block is sitting 3m from the edge of a 5m long table. The collision happens with the smaller block's distance being 2m from the table and the larger blocks d =...

1.So the problem given is the following, "A small wooden block with mass 0.775 kg is suspended from the lower end of a light cord that is 1.58m long. The block is initially at rest. A bullet with mass 0.0134 kg is fired at the block with a horizontal velocity v0. The bullet strikes the block...

Homework Statement Find the tension in string 1 I don't get the same answer as the solution manual. My attempt: The y-component of string 2’s tension must equal the weight of the block. The x-component of string 2’s tension must equal the tension of string 1. T1=T2x=T2y/tanθ =23°...

Homework Statement http://postimage.org/image/6exf0w475/ B) I have a question on this part. Would I just use the "v = v0 at" equation here because the question states "after it starts moving?" Do i need to include static/kinetic friction into this equation somehow? Homework Equations part...

[b]1. A 5kg block is held at rest against a vertical wall by a horizontal force of 100 Newtons. 1-What is the frictional force exerted by the wall on the block 2-What is the minimum horizontal force needed to prevent the block from falling if the static coefficient of friction between the wall...

Say we have a friction-less inclined plane in the shape of a right triangle, sloping downward to the right. The angle above the horizontal axis is inconsequential for these specific purposes aside from the fact that we know it is inclined above said axis. We then have a block sliding down (to...

Homework Statement You observe that after sliding down a distance of 2.61 m along a 5 m long track that is inclined at 20 degrees to the horizontal, a block of wood has a velocity of 0.13 m/s. If the coefficient of kinetic friction between the wood and the surface of the track is 0.40, what...

A block is attached to a spring which is attached to a stationary wall. When the block is pulled out to x = +5.0 cm, we must apply a force of magnitude 370 N to hold it there. We pull the block to x = 14.0 cm and then release it. How much work does the spring do on the block when the block moves...

1.A 10 kg block (A) on a table is connected by a string to a 78-kg mass (B), which is hanging over the edge of the table. Assuming that frictional forces may be neglected, what is the magnitude of acceleration of the 10kg black when the other block is released? 2.So the acceleration of the...

Hi everyone, I am trying to solve the following problem. Is there exist a transformation matrix T, different then the block diagonal, with all blocks the same, such that the form of the matrix A=[A1 A2 ; I 0], is preserved? All blocks of A are in R^{nxn}, I is identity and 0 is zero matrix. In...

Homework Statement A 5.0 kg block is placed near the top of a frictionless ramp, which makes an angle of 30.0o degrees to the horizontal. A distance d = 1.3 m away from the block is an unstretched spring with k = 3000.0 N/m. The block slides down the ramp and compresses the spring. Find the...

Homework Statement A block starts at rest and slides down a frictionless track except for a small rough area on a horizontal section of the track It leaves the track horizontally, flies through the air, and subsequently strikes the ground. The acceleration of gravity is 9.8 m/s2 . What is...

Homework Statement Three blocks A,B and C, whose masses are 9 kg, 9 Kg and 18 kg respectively as shown in the figure, are released from rest. The co-efficient of friction between the block A and the horizontal surface is 0.5 and The co-efficient of friction between the block B and the...

Homework Statement A moving 1.90 kg block collides with a horizontal spring whose spring constant is 237 N/m. The block compresses the spring a maximum distance of 13.00 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.430. What...

A 2.50 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 6.71 N and a vertical force P are then applied to the block. The coefficients of friction for the block and surface are μs = 0.4 and μk = 0.25. Determine the magnitude of the frictional force acting...

Hello everyone, I would like to post this problem here in this forum. Having the following block matrix: \begin{equation} M=\begin{bmatrix} S_1 &C\\ C^T &S_2\\ \end{bmatrix} \end{equation} I would like to find the function $f$ that holds rank(M)=f( rank(S1), rank(S2)). S_1 and S_2 are...

Hi everybody, I’m trying to compute the square root of the following squared block matrix: \begin{equation} M=\begin{bmatrix} A &B\\ C &D\\ \end{bmatrix} \end{equation} (that is M^(1/2))as function of A,B,C, D which are all square matrices. Can you help me? I sincerely...