Impulse Definition and 905 Threads

Homework Statement I have attached the problem. A 14,000 kg tractor traveling north at 21 km/h turns west and travels 26 km/h. Calculate the change in the tractor's a. kinetic energy b. linear momentum (magnitude AND direction) Homework Equations [/B] delta KE = (1/2)mv^2 - (1/2)mvi^2...

This is in relation to a homework question: But I don't need assistance on the question itself, but the concept behind it. A mass of .4kg travels in the positive direction for 67m/s until a separate force is applied to M in the negative direction at 14m/s for .027 seconds. Impulse = 32.4 It...

I wonder if it is possible to at least estimate the stress (or the impact force) that the cube in question will experience due to the collision with the concrete floor. Assumptions: 1. The cube is dropped from height h 2. The cube is relatively small, thus we can neglect air resistance...

Homework Statement Small object A (mass: [m][/A]) is traveling in a linear path on a horizontal surface and collides elastically with small object B ([m][/B]), at rest on the same line, with a speed of v. Friction between the objects and the horizontal surface is negligible. What is the...

Why are impulse and momentum treated as different quantites?

Hello, I am trying to estimate transfer function of unknown LTI system, given output and assumed input as point process. I have measurement of output, while input, which is assumed to be point process, could be created synthetically using known times and amplitudes. My questions: 1. What is...

If there is a ball falling from a height due to gravity, and you keep your hand still and let the ball fall onto it, it stops suddenly and makes a loud noise. However, if you lower your hand as you catch the ball, like when a cricketer catches a fast moving ball, the catch is almost silent. I...

Homework Statement A uniform circular disc of mass 2m and radius R placed freely on a horizontal smooth surface as shown in the figure. A particle of mass m is connected to the circumference of the disc with a mass less string. Now an impulse J is applied on the particle in the directions...

Homework Statement let's use this symbol to denote the unit impulse function δ When integrating the unit impulse function (from negative infinity to infinity) ∫δ(t) dt I know that this results in a value of 1 and is only nonzero at the point t = 0. However for example take this integral into...

Homework Statement I have an impulse response h(n)=e^(0.1n)*[u(n)-u(n-8)] and an input x(n)={0,1,2,3,0}, how do I find the output y(k)? [/B]Homework EquationsThe Attempt at a Solution i don't even know how to solve. should i try convolution or should i substitute the values of x(n) in h(n)...

Homework Statement A block of mass 100 grammes was stationary on the flat surface at ##x = 0##. At time ##t = 0## a horizontal force of 10 Newtons was applied on the block in the positive x direction during ##\Delta t = 3## seconds. Find at what x position the block will stop, if the...

Homework Statement A fireman's hose acting as a water cannon, directs 100 litres/s (100 kg/s) of water horizontally at your chest at speed 5 ms-1. Assuming water essentially falls to the ground after hitting your chest (rather than say reflecting horizontally backwards), what horizontal force...

What is the correct way to calculate the impact force of a 2"x4" flying through the air and hitting a solid cross beam? The knowns are: Velocity: 50 ft/sec Distance To cross beam: 12 ft 2" x 4" Weight: 9 lbs I don't know much the cross beam will deflect on impact, so the stopping distance is...

Homework Statement I was recently assigned a project of, tl;dr, building a wall to reduce the maximum force during a collision. Let me start by describing the setup as best as I can. First, here's an image: These aren't the exact track and carts we're using, but they provide a great...

Homework Statement May I ask you something about a task from the last years test at faculty of mathematics and physics, University of Ljubljana, Slovenia ... There is a disk at the end of a pole. We cause some F dt tangentally on the disk, which causes the change of momentum. I need to...

Homework Statement Two identical spheres A and B are kept on a smooth surface. They are given the same impulse I. The lines of action of impulses pass through the center of A and away from the center of B. Then: (A) linear kinetic energy of B will be less than that of A. (B) B will have...

Suppose there is a black box resting on a flat surface, which surface is rigidly attached to the earth. Suppose inside the black box there is a process initiated which causes the black box to lurch to the right 3 centimeters and let's say after one second the box comes to a complete stop. (No...

Homework Statement After winning a prize on a game show, a 72 kg contestant jumps for joy. A. If the jump results in an upward speed of 2.1 m/s, what is the impulse experienced by the contestant? b. 0.0 c. 75.6 kg.m/s d. 151.2 kg.m/s e. 226.8 kg.m/s B. Before the jump, the floor exerts an...

In most "introduction to dynamics" textbooks, why do we teach work and energy? Consider a textbook like Hibbeler's Dynamics: Chapter 1: kinematics of particles Chapter 2: kinetics of particles Chapter 3: Work Energy Chapter 4, Impuse and Momentum AND THEN IT REPEATS FOR BODIES Now, I...

I know there are many websites on Internet but I can not understand any. My teacher says impulse is only during a collision of one body with other (when a car collide with other car etc.). My question is will there be impulse when a body is accelerating , when it collides with the air molecules...

1. A baseball of mass 0.1 kg is moving horizontally at a speed of 40 m/s when it is stuck by a bat. It leaves the bat in a direction at an angle φ = 30◦ above its incident path and with a speed of 50 m/s. • Find the impulse the bat exerts on the ball. • Assuming the collision lasts for 0.0015...

We generally consider impulse during a colliion but if a body is simply accelerating e.g a car moving with a acceleration will it have impulse? [SIZE=16px]If a body has an acceleration it may have a change in velocity there will be impulse and if moving with uniform velocity it may not have...

So Imagine a ball moving off a frictionless cliff with a velocity v to the right, at the bottom of the cliff the surface has friction. So after the collision, the x component of the velocity would be reduced, and the angular momentum would be fixed clockwise because the frictional impulse...

A particle of mass 3kg moving at 15ms^−1 collides with one of mass 2 kg moving at 5ms^−1 in the same direction. Calculate the velocities after the collision i. the collision is elastic. ii. Suppose that in the collision of part (i), the final velocities are not parallel to the initial...

Homework Statement Two average forces. A steady stream of 0.250 kg snowballs is shot perpendicularly into a wall at a speed of . Each ball sticks to the wall. Figure 9-49 gives the magnitude F of the force on the wall as a function of time t for two of the snowball impacts. Impacts occur with a...

Hi! I don't know if I'm in the right forum of this site but I'm trying anyway. I was just wondering if someone could explain how the step- and impulse response is related to an angular position (of e.g. a spacecraft )? Just a little about the theory since I am trying to actually understand...

A 10 gram rubber ball and a 10 gram iron ball are thrown at a wall with equal speeds. The rubber ball bounces back at almost the same speed with which it was thrown at the wall, while the iron ball bounces back at half the speed with which it was thrown at the wall. Which ball exerts a larger...

Homework Statement A 50 kg woman jumps straight into the air, rising h meters from the ground. What impulse does she receive from the ground to attain this height? Homework EquationsThe Attempt at a Solution Impulse is defined as a change in momentum. Thus, ##I_{woman} = m(v_f - v_i)##. Since...

Homework Statement a bullet 15 g travels 300 m/s then hit the plastic sheet that is thick 2 cm and pass through it. After the crash, the bullet travels 90 m/s ( continue to lose the velocity ) How much the average force acting on the bullet? Homework Equations Momentum = Mass x Velocity The...

Homework Statement A satellite moving in a highly elliptical orbit is given a retarded force concentrated at its perigee. This is modeled as an impulse I. By considering changes in energy and angular momentum, find the changes in a (semi major axis) and l (semi latus rectum). Show that \delta...

Homework Statement A block A of mass m traveling with speed v collides head-on with a stationary body B of mass 2m. The two bodies stick together. Calculate the impulse exerted by body B on body A during the collision. Homework Equations ## J = p_{final} - p_{initial} ## ## p_{initial} =...

We all know that starships in Star Trek have artificial gravity. They also have inertial damper. Therefore, we can conclude that they have the ability to counteract gravity. However, as those technical manuals of Star Trek tell us, starships are using impulse drives for slower-than-light...

Hey I got a little imaginary experiment which is little bit confusing to me. Maybe somebody with knowledge in signal transmitting or just good knowledge of physics can help me out. So let's say there are two parallel conductors which length is endless and resistance is zero (no losses and...

I was doing a physics problem on my homework and was not sure which of the three questions below i got wrong as I got a 2/3. I believe the second one might be wrong, but I'm not to sure. Two fan carts labeled A and B are placed on opposite sides of a table with their fans pointed in the same...

Hello there, I'm working on a design project where I have come upon a mechanical problem that I'm having trouble with. Basically I'm making a kind of specialized stapler (at least I think that's a good translation...), and I want it to clamp the staplers using a mass accelerated by a spring...

Homework Statement [/B] Suppose I have a stationary object of mass 'm' and I want to apply a momentary force in the vertical direction so that it just reaches the height 'h'. So how do I calculate the impulse required in this case? Also how do I exactly define the delta(t) for the momentary...

Hello, My memories of fluid mechanics are very rusty and therefore I was wondering if you could help me with this hypothetical problem. Let's say I want to generate very high hydrostatic pressures in a liquid (of order of 400 kbar). Would it be enough to do the following: take a rod weighting 1...

Homework Statement Two balls with the same mass are dropped from the same height. After colliding with the ground, one of the balls "A" bounces higher than the other ball "B." Neglect air resistance. Is mechanical energy conserved ? Are they subjected to the same impulse after colliding with...

Homework Statement Pancake collapse of a tall building. In the section of a tall building shown in Figure (a), the infrastructure of any given floor K must support the weight W of all higher floors. Normally the infrastructure is constructed with a safety factor s so that it can withstand an...

Homework Statement A car hits another car at rest. Debris is found 6.75m from the cars, the two cars stuck together over a distance of 6.75m, there are skid marks a distance of 312m before the car crash, car 1=2946kg, car2=1232kg, coefficent of friction is .72. Find the initial velocity of car...

Hi everyone! I've been getting confused with Momentum, Force and Impulse. From my understanding force when applied on object helps it gain momentum, the higher the force applied the higher the acceleration therefore more the momentum. And according to Sir Isaac Newton's first law of motion, the...

Homework Statement Consider the following two scenarios. (A) A pitcher throws a ball at -55m/s and the batter swims at 25m/s. (B) A pitcher throws a ball at -25m/s and the batter swings at 55m/s. The ball has a mass of 0.15kg and the bat has a mass of 1kg. Assume that the impact between the...

Im sure Imma mess this up, probably because I am really tired...but I have a bullet that weights .015kg's and is moving at 285m/s, so 609.18J's as with KE. I hit a 70kg block, penetrates .3048 meters thus exerting 1998.62N's of force, which is a lot of force. .3048/285m/s so 0.00106 seconds...

1. What forces and impulse impact on a bouncing basketball? I understand that it is the gravitational force, when it falls, then the normal force when it is on the way back. Are there any additional powers? The momentum, I came to the potential energy = kinetic energy, where I got the speed...

Homework Statement The 3kg collar is initially at rest and is acted upon a force Q which varies by the the graph shown. Knowing that the coefficient of kinetic friction is 0.25, determine the velocity of the collar at t = 1 s and t = 2s. Homework Equations FΔt = mΔv Ffriction = .25 x N The...

Homework Statement Consider a LTI system defined by the following difference equation: ##\mathrm{y}[n]=-2x[n]+4x[n-1]-2x[n-2]## a) Determine the impulse response of the system b) Determine the frequency response of the system Homework Equations DTFT...

Homework Statement An small doll is attached to an elastic cord which is suspended from a support as shown. An accelerometer is attached to the doll. The doll is allowed to fall and produces the graph shown. When the recording system is started the doll is stationary at the upper support...

I understand that if there is a body in a circular orbit around the Earth (or any other thing), and there is an impulse directed radially out away from the Earth against the orbiting body, the body will end up in an elliptical orbit, which will pass through the original circular orbit. This got...

Homework Statement A sphere with mass 0.4 kg circles around a circular trajectory with ray 2 m and angular speed 12 rad/S. Which is the momentum of the impulse of the sphere? Homework Equations L=Iw=2/5mr^2w w(angular speed) or L=mr^2w The Attempt at a Solution I think we should use the first...

Homework Statement Homework Equations ΣFΔt = impulse mΔv = momentum ΣFΔt = mΔv The Attempt at a Solution I got the first part of the question (I hope I did it correctly), I just don't understand what my professor means by resultant impulse... Do I use the same equation? Is it going to be...