What is Impulse: Definition and 929 Discussions

In the field of consumer behavior, an impulse purchase or impulse buying is an unplanned decision by a consumer to buy a product or service, made just before a purchase. One who tends to make such purchases is referred to as an impulse purchaser, impulse buyer, or compulsive buyer. Research findings suggest that emotions, feelings, and attitudes play a decisive role in purchasing, triggered by seeing the product or upon exposure to a well crafted promotional message.

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  1. S

    Finding Displacement Using Impulse Momentum: A Problem with Monkeys and a Pulley

    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...
  2. B

    Transfer function to Pole-Zero Plot to Impulse Response Curve

    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...
  3. M

    How Does Conservation of Energy Apply to a Theme Park Ride Through Water?

    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)...
  4. R

    Speed of Nerve Impulse Propagation in ABCD Fibers

    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
  5. E

    Sifting Property of the Impulse Function

    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)...
  6. M

    General Definitions of Impulse and Work

    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...
  7. B

    Impulse of Soccer Ball on Head

    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...
  8. A

    Impulse - I am suspecting a wrong answer on the key.

    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...
  9. nukeman

    Calculating the Impulse (Magnitude and direction) question - Thanks

    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
  10. A

    Unit step response and unit impulse response

    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...
  11. QuarkCharmer

    Impulse Momentum (et al.) test

    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...
  12. C

    Calculating Momentum Impulse During Thunderstorm

    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...
  13. Z

    TNT Overpressure and Impulse Calculation

    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...
  14. B

    Impulse and Momentum, 2 dimension

    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...
  15. L

    Collision for Momemtum and impulse

    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?
  16. B

    Can capacitors act as short circuits when first turned on?

    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...
  17. D

    How Does Holding an Air Rifle Affect Recoil Speed?

    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...
  18. L

    Calculating Impulse Force for a Pitched Ball: How to Find the Final Velocity?

    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...
  19. A

    Impulse and Momentum, their unit and relationship

    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...
  20. P

    Calculating Cannon Ball Barrel Length: Impulse and Velocity

    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)...
  21. L

    Impact (impulse) between two rotating (around fixed axis) bodies

    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...
  22. S

    Axons generate impulse or transfers information

    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...
  23. J

    Impulse imparted by the ground on the ball?

    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...
  24. J

    Impulse: Jumping before the elevator crashes

    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...
  25. T

    (simple problem) Impulse force caused by cube collision?

    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...
  26. K

    Question on momentum, impulse, and collisions

    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...
  27. S

    Impulse and impulsive force and momentum

    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...
  28. M

    Impulse of a ball hitting the wall

    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...
  29. A

    What is the direction of impulse delivered to the ball?

    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...
  30. O

    Finding the magnitude of impulse

    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)) =...
  31. E

    Impulse question about Force and time

    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...
  32. Ryan_m_b

    What is the maximum possible specific impulse.

    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...
  33. reddvoid

    Discrete vs Continuous Time Impulse Signals

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

    Cross Post from Classical Physics: Calculus in Impulse Momentum Theorem

    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...
  35. E

    Calculus in Impulse Momentum Theorem

    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...
  36. L

    What is the Linear Impulse of a Potato with Changing Speed?

    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?
  37. L

    Calculating Impulse: Homework Solution

    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...
  38. J

    I can't understand the discrete time unit impulse response and convolution

    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...
  39. B

    What Happens When You Integrate the Square of the Delta Function Over All Space?

    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...
  40. P

    Calculating Unit Impulse Response

    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...
  41. C

    Mechanics - falling ball and impulse

    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...
  42. N

    What is the minimum impulse required to stop a freely pivoted rod in motion?

    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...
  43. J

    I cant understand the impulse response in convolution

    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...
  44. P

    Solving Momentum and Impulse: Tennis Ball Force & Velocity

    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...
  45. K

    Calculating Speed after Impulse of 6 Ns

    Homework Statement A 2kg object is moving to the right with a speed of 4 m/s when it experiences an impulse of 6 Ns . Homework Equations mv+mv=mv The Attempt at a Solution Since the impulse is just the change in momentum I put in 2(4)+2v=6 so wouldn't v be -1?
  46. G

    Find the unit impulse response

    Find h[n], the unit impulse response of the system descrived by the following equation: y[n]+3y[n-1]+2y[n-2]=x[n]+3x[n-1]+3x[n-2] Can this be rewritten as?(n-->n+2) y[n+2]+3y[n+1]+2y[n]=x[n+2]+3x[n+1]+3x[n]
  47. T

    Momentum, Impulse, and Collision #2

    Homework Statement A horizontal force of 0.80 N is required to move a mass M2 = 5kg across the surface with a constant acceleration. With the block initially at rest, a 0.02kg bullet M1 fired horizontally into the block causes the block (with bullet inside) to slide 1.5m before coming to rest...
  48. T

    Biomechanics Problem- Impulse and projectile motion

    Homework Statement A long jump trial, the vertical ground reaction force of an athlete’s take-off leg was measured as shown below. At foot strike, the horizontal velocity of the take -off leg was 8.00 m/s and the vertical velocity of the take-off leg was -2.30 m/s. (Chart as Attachment)...
  49. J

    Finding the impulse response of a system without using Z-Transform

    Homework Statement Find the impulse response of the following: Assume the system is initially at rest. y[n] - (1/2) y[n-1] = x[n] + 2 x[n-1] + x[n-2] The Attempt at a Solution To find the impulse response y[n]: we know that y[n] = homogenous solution + particular solution so... lamda -...
  50. T

    Momentum, Impulse, and Collision

    Homework Statement Two skaters stand in the center of a circular rink of frictionless ice. When the skaters push on one another, they move apart along the same straight line. If the skater of mass m1 = 50 kg reaches the edge of the rink after 12 seconds and the other skater reaches the...
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