Impulse Definition and 935 Threads

http://a6.sphotos.ak.fbcdn.net/hphotos-ak-ash4/388044_10150449591037412_816037411_8386849_1415117382_n.jpg Homework Statement A ramp system is set up. Due to friction the ramp has an efficiency of 82%. Two cars of equal mass are allowed to collide and car 1 starts from rest at height h1...

Homework Statement 18. A 75 kg swimmer dives horizontally off a 300 kg raft. If the speed of the raft immediately after the swimmer dives off is 1.0 m/s, at what speed did the diver leave the raft? A. 2 m/s B. 4 m/s C. 6 m/s D. 8 m/s E. 10 m/s Homework Equations p=mv The...

Im struggling to do the following question. Any help would be appreciated A following system has the following difference equation y(n)+ 1/8y(n-1) - 5/8y(n-2)=1/2x(n-1) First part is to calculate the system transfer function using the z transform. Then get the frequency response and...

Homework Statement In a collision between two unequal masses, how does the impulse imparted to the smaller mass by the larger mass compare with the impulse imparted to the larger mass by the smaller one? A) It is smaller. B) The answer depends on how fast they are moving. C) They are...

Hello everyone. In Physics class, we did a lab where we dropped golf balls into a box of sand from a height of 9 ft (or 2.743 meters). The golf ball had a mass of .046 kg. We were not allowed to time the drop so these were the only givens. We also measured the depth of the "crater" the golf...

How do we represent data in terms of impulse waveform ??

I am having a really hard time with dynamics of rigid bodies, but i think doing this problem will clear up some confusion i have. Homework Statement A massless rope hanging over a frictionless pulley of mass M supports two monkeys (one of mass M, the other of mass 2M). The system is released...

Homework Statement The question gives a transfer function. and we are asked to put it into pole zero form and then we are asked to sketch the positions of the poles and zeros of the system on the complex plane and then sketch the impulse response corresponding to each pole. i have...

Homework Statement On a ride in a theme park, a carriage of mass 450 kg is travels horizontally at a speed of 18 m s–1. It passes through a shallow tank containing stationary water. The tank is 9.3 m long. The carriage leaves the tank at a speed of 13 m s–1. e) For the carriage in (b)...

Homework Statement I would like to know the speed of the propagation of nerve impulses in A B C D fibers Homework Equations The Attempt at a Solution

1. The problem I have a problem grasping what the point of the sifting property of the Dirac function is. It isolates the value at a point in a function, right? Doesn't just substituting that point into the function do exactly the same thing? Homework Equations Sifting poperty: if f(t)...

In classical mechanics, if we consider the motion of a particle of mass m, then The mass m is constant The vector \vec{c} can be: \ldots or \vec{r} or \vec{v} or \vec{a} or \vec{j} or \ldots \vec{c}_1 = d\vec{c} / {dt} \vec{c}_2 = d^2 \, \vec{c} / {dt^2} Definition of...

Homework Statement Recent studies have raised concern about 'heading' in youth soccer (i.e., hitting the ball with the head). A soccer player 'heads' a size 5 ball deflecting it by 31.0°, and keeps its speed of 10.40 m/s constant. A size 5 ball has a mass of approximately 0.446 kg. What is the...

Impulse -- I am suspecting a wrong answer on the key. A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor? * 9.6N/s * 2.4N/s * 6.4N/s * 1.6N/s * 1.0N/s...

Homework Statement Below is a snapshot of the question I can't seem to solve. I can't seem to find in my textbook how to work out this problem...:( Any pointers? Thanks! Homework Equations The Attempt at a Solution

In my ODE course I learned that for a time invariant operator p(D), if p(D)x=q(t) then p(D)\dot{x}=\dot{q}(t). Then the professor "justified" that the derivative of the unit step response, v(t), is the unit impulse response, w(t), because the derivative of unit step function is the Dirac...

Homework Statement I took a test today and I am pretty sure I got everything right except for this one problem that was on there which I am unsure of. If I remember correctly, it went like this: It said there was a particle of mass 2 kg moving with a speed of 5 m/s to the right. Then there...

Thunderstorm During a violent thunderstorm, hail of diameter 2.0 cm falls directly downward at a speed of 25 m/s. There are estimated to be 120 hailstones per cubic meter of air. (a) What is the mass of each hailstone (density = 0.92 g/cm3)? (b) Assuming that the hail does not...

After looking online and checking papers I`m not closer to get a useful result. The thing is I find some many different equations and they all give totally different answers. A wall is 3 m high and infinintly long. An explosion of 25 kg TNT is done at a distance of 10 m on the ground. What...

Been stuck on this question for days and any help would be greatly appreciated A baseball going horizontally at 32.0 m/s [E] with a mass of 0.152 kg is hit by a bat for 0.002 seconds. the velocity after the ball after contact is 52.0 m/s [W 20 N] Find the impulse experienced by the ball...

If you were in a car, and you hit a bug. Compared to the force that acts on the bug, how much force acts on the bus, is it greater lesser or equal?

Let u(t) = \begin{Bmatrix} 1, & t \geq 0 \\ 0, & t<0 \end{Bmatrix} and let's have a simple circuit. Solo capacitor, connected to a DC voltage U0, a switch S exists. For purposes of this problem, I can mark the voltage across the capacitor as Vc(t) Vc(t)=u(t)*U0 Current...

Kim holds a 2.0 kg air rifle loosely and fires a bullet of mass 1.0 g. The muzzle velocity of the bullet is 150 m/s. What is the recoil spped of the rifle? The next shot the girl holds the rifle tightly against her body. Calculate the new recoil speed assuming the girl has a mass of 48kg. I'm...

Homework Statement A fast ball is pitched at a batter who hits a pop fly vertically into the air. The ball was moving horizontally at 38.45 m/s when it was hit by the bat. As it left the bat it was moving vertically and reached a maximum height of 44.196m. The mass of a baseball is 0.1417 kg...

Homework Statement Impulse is defined as: force x time a) Find its unit expressed in term of the base units. b) What quantity has the same unit? What could it mean? (Impulse = change in momentum) Homework Equations I = F x T P = mv The Attempt at a Solution a) First, we...

Homework Statement The impulse on a human cannon ball is 2.5  103 N·s. The cannon ball has a mass of 65 kg. Homework Equations How long is the barrel of the cannon if the cannon ball leaves the cannon at 120 km/h? The Attempt at a Solution I used the formula J=ma(delta t)...

Hello! I would be very happy if someone could give me a little advice or a hint about my problem. The problem: I have to analyze the impact (colision) of two rotating bodies around a separate fixed axis. The body #1 hits (when rotating) the stationary body #2, then they both start/continue...

I know the fact that, if the total strength of the nerve signal exceeds the threshold at axon hillock, it triggers an action potential. But if someone asks me a question about axon being the nerve impulse generator or the structure responsible for transfer of information, then I would say that...

Homework Statement A mass 100.0 g is dropped from some height above the ground and rebounds to a point where it has 78% of its initial gravitational potential energy. As it hits the ground, it is moving at 1.2 m/s. What is the impulse imparted by the ground on the ball? Homework...

Hello! Homework Statement After the cable snaps and the safety system fails, an elevator cab free falls from a height of 36m. During the collision at the bottom of the elevator shaft, a 90 kg passenger is stopped in 0.005 s. Assume that neither the passenger nor the cab rebounds. What are...

I'm only interested in the 2d representation of this, as I will be applying whatever I learn to a physics engine Anyways, I know that a block resting on a flat surface will have a normal force acting on it equal to its weight However, I'm not interested in gravity But, say a block comes...

Homework Statement Question:A 2,800kg car is traveling at a velocity of 22m/s. The car hits the wall and comes to a complete stop. The collision took 0.3 seconds. a. What is the cars impulse? b. What force did the wall exert on the car? c. What force did the car exert on the wall? d...

1)anyone tells me what is the differences between impulse and impulsive force?? 2) impulsive force = force X time momentum = mass X change in velocity impulse force = momentum. i know why but i don't understand why impulsive force is same as momemtum, if i want to decribe something...

Homework Statement Calculate the change in momentum of a 120g pool ball hitting at 9m/s and rebounding at 6m/s. It rebounds at an equal and opposite angle of 45 degrees. Pi = 9m/s Pf = 6m/s angle = 45 degrees Homework Equations The Attempt at a Solution I have done all my...

Homework Statement A player bounces a 0.47 kg soccer ball off her head, changing the velocity of the ball from vi= (8.8 m/s)x + (-2.4 m/s)y to vf= (5.0 m/s)x + (3.0 m/s)y. If the ball is in contact with the player's head for 6.7 ms, what is the direction of the impulse delivered to...

Homework Statement A proton has mass 1.7×10−27 kg. What is the magnitude of the impulse required to increase its speed from 0.991c to 0.994c? Homework Equations Impulse = mV_f{}-mV_i{} The Attempt at a Solution Impulse = mV_f{}-mV_i{} = 1.7e-27*(.994*3e8)-(1.7e-27*(.991*3e8)) =...

Homework Statement If, when catching the ball, the child applied triple the force, then the length of time that it would have taken to slow the ball would have been: A. 9t B. 3t C. 1/3t D. 1/9t Homework Equations Impulse = Net force x Change in time The Attempt at a Solution...

Hi there, I'm aware that a hypothetical antimatter rocket could have a specific impulse of ~1,000,000 seconds. At first I thought that this would be the highest isp possible as antimatter/matter collision releases all the energy in the mass. However as wikipedia put's it "It is not...

Whats the difference between a discrete time impulse and a continuous time impulse signal ?

Hi, This is my first post. Sorry for the mistakes it certainly contains. I have two questions. First, is there a tutorial for using embedded LaTex? I found some general tutorials on LaTex, but I couldn't get some of the commands listed in that tutorial to work in the embedded LaTex code...

Hi, This is my first post. Sorry for the mistakes it certainly contains. I have two questions. First, is there a tutorial for using embedded LaTex? I found some general tutorials on LaTex, but I couldn't get some of the commands listed in that tutorial to work in the embedded LaTex code...

Homework Statement A 0.30 kg potato speed changes from 6.0 m/s to 2.0 m/s. What is the linear impulse of the potato Homework Equations The Attempt at a Solution mv(final) - mv(initial) .3 * 2-.3 * 6 = This gives me the change but after that I am lost... any help?

Homework Statement A 0.060-kg handball is thrown straight toward a wall with a speed of 11 m/s. It rebounds straight backward at a speed of 8.6 m/s. (c) The rebounding ball is caught by a player who brings it to rest. During the process, her hand moves back 0.40 m. What is the impulse...

hi, i have trouble in understanding the concepts of the impulse response first of all, let's assume that we have a signal y[n] = x[n] which is time invariant and linear, hence if I understand correctly linear means that if for input a*x1[n] we have an output a*y1[n] b*x2[n] we...

Homework Statement \int \delta(t)^{2} dt from -infinity to +infinty Homework Equations \int^{\infty}_{-\infty}\delta(t)dt = 1 \int uv dt = u\int v dt - \int u^{'}(t)\int v dt dt \int^{b}_{a} f(x) dx = F(b) - F(a) \delta(-\infty) = \delta(\infty) = 0 The Attempt at a...

I am trying to teach myself DSP, owing to bad lecture notes. In particular at the moment I'm trying to calculate impulse responses for LTI systems, given the system equation. I would really appreciate it if someone could tell me if my working and assumptions below are correct for the following...

Homework Statement Hi all :biggrin: The Attempt at a Solution First of all, can someone tell me how to get the eqn in hint? :redface: And when i try solving it using the hint ... of ball (velocity of separation) = e(velocity of approach) v' = e √(2gh) = √(gh/2) let the...

Angular Impulse ****Please Help!**** A thin uniform rod of length L and mass m is freely pivoted about its end. Its moment of inertia is (1/3)ML2. The rod is held horizontally and released from rest and its angular speed when it passes the vertical position is \sqrt{3g/L} When the rod is...

Homework Statement i have this graph http://img858.imageshack.us/img858/1346/56954457.png and i need to find h-1[k] i don't understand, i know that the impulse response is the response for input -> δ[n], in this case it will be δ[n+1], but i don't understand how to calulate the response...

A tennis player is able to exert an average force of 28N when hitting a ball. Calculate the impulse if the racket is in contact with the ball for 0.1 seconds: Then I did: 28 x 0.1 and got 2.8 kg m/s. The follow up question was: A 70 g tennis ball comes toward the player at 30 m/s and it hit...