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. N

    Fourier transform of a modified impulse train

    I need to find the Fourier Transform (FT) of: x(t)=\sum^{\infty}_{n=-\infty}((-1)^{n}\delta(t-nT)) Not really sure how to solve this problem, so any help will be appreciated. Also, if you guys know a good reference for non-uniform sampling and reconstruction, please post it.
  2. WolfOfTheSteps

    Fourier Transform of a Modified Impulse Train

    I hope this is OK to post here. I thought it would be better here than in the math questions forum, since you are EEs, and probably have more experience dealing with things related to the delta function. Problem Let \hat{x}(t) = \sum_{k=-\infty}^{\infty}\delta(t-2k). Now let x(t) =...
  3. L

    Impulse Momentum Theorem for Calculating Fall Height

    Impulse Momentum Theorem! Homework Statement A student (m = 63 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.0180 s. The average force exerted on him by the ground is +16000. N, where the upward direction is taken to...
  4. D

    Angular momentum - impulse on the axis

    Homework Statement A uniform square board ABCD had mass 5kg and sides of length 60cm. The board is hinged at A so that it can rotate freely in a vertical plane. A light string of length 1 metre is attached to B and to a point E, 80cm above A. The bards rests in equilibrium with AB horizontal...
  5. P

    Solve Impulse Experienced by 70kg Person Jumping 5m

    im reviewing for my final tomorrow, and there is a question that asks for the impulse experienced if a 70kg person lands on firm ground and stops after jumping from a height of 5m. what equation should i use to solve this?
  6. S

    Calculating Velocity Change of a 300g Ball with Impulse

    the ball has a mass of 300g and is traveling at 20m/s. what will be its new velocity? section is on momentum and impulse
  7. J

    Calculating Stopping Time and Distance Using Impulse Momentum Theorem

    I have a question I am looking for an asnwer: Using the impulse momentum theorum, describe how it is possible to drop an egg from a 2 story high building and not have the egg break.
  8. M

    Find the Impulse and Momentum

    Homework Statement Before a collision, a 25-kg object is moving at +12m/s. Find the impulse that acted on teh object if, after the collision, it moves at: a. 8.0m/s b.-8.0m/s Homework Equations (c)=changes in: To find impulse, we would use the F=ma, so F=m*(c)v/(c)t So, F(c)t = m(c)v...
  9. H

    Net Impulse Question: Calculate Momentum, Impulse, and Change in Momentum

    Homework Statement The net force acting on a glider on an air track (an essentially frictionless system) varies with time as shown in the following diagram. The vertical scale is such that the space between consecutive vertical gridlines is 5.0 Newton(s). The glider has a mass of...
  10. Y

    How Does Impulse Affect Cart and Boy Dynamics?

    Homework Statement A 50. kg cart is moving across a frictionless floor at 2.0 m/s. A 70. kg boy, riding in the cart, jumps off so that he hits the floor with zero velocity. a. What impulse did the boy give to the cart? b. What was the velocity of the cart after the boy jumped...
  11. A

    Impulse is the product of force and time

    I am in great confusion in impulse term. As Impulse is the product of force and time and it is equal to change in momentum. Does a moving object have impulse? if not then why not?
  12. F

    A problem invovling Force, Impulse, Velocity and Acceleration

    Homework Statement Heres the problem i have been given in Grade 11 Physics for homework (keep in mind that i haven't done calculus yet so don't do anything too tricky): A satellite of mass 240 kg moving in free space at a velocity of 6000m/s is struck by an unknown object which causes it to...
  13. M

    Calculating Fmax in a Tennis Ball Collision

    I am having trouble with this question, I know what I need to find, just don't know what route to take. A 53.0 g tennis ball with an initial speed of 30.5 m/s hits a wall and rebounds with the same speed. The figure below shows the force of the wall on the ball during the collision. What is...
  14. Z

    Understanding TTL Impulse Outputs

    i am working with an encoder that says its output is impulse(ttl). I'm not quite sure what this means. is it just a digital signal? how does it work? any help you can give me would be great.
  15. C

    Harmonic oscillator, friction, impulse

    Homework Statement A linear harmonic oscillator is subject to friction(stokes). The Oscillator gets an Impulse at the time t = 0 at the rest position. What is the equation of motion for the time interval 0 - t0?Homework Equations Friction force: Fr = -a * x'(t); a = constant (stokes friction)...
  16. A

    Momentum and Impulse Questions

    Can anyone help me solve these questions on momentum and impulse? Thank you! 1. A 55 kg swimmer is standing on a stationary 235 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +5.3 m/s relative to the shore. Find the recoil velocity that the raft would...
  17. J

    Solving Impulse & Momentum Problems

    Ok, so this problem is kind of complicated, so ask me if you need clarification. This problem deals with Impulse and Momentum. There are two balls hanging vertically from a horizontal plane. Ball A is pulled back and is set up to strike ball B. Given for ball A - mass = 1.5 kg. Height...
  18. A

    Impulse and Momentum (finding net force)

    A 0.500-kg ball is dropped from rest at a point 1.20 m above the floor. The ball reboundes straight upward to a height of 0.700 m. What are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor? I have been trying to solve this...
  19. R

    Impulse and Momentum: Find Common Velocity & Fraction of Kinetic Energy

    A 1550kg car, traveling with a velocity of 12m/s plows into a 1220kg stationary car. During the collision the two cars lock bumpers and then move together as a unit. (a) what is tehir common velocity just after the impact? (b) What fraction of the initial kinetic energy remains after the...
  20. R

    Kinetic Energy Not Necessarily Equal w/ Same Momentum

    Conceptual Question If two objects have the same momentum do they necessarily have the same kinetic energy? Give your reason. I would say no basically from just looking at formulas. P=mv for momentum K.E.= 1/2mv^2 for kinetic energy
  21. X

    Understanding Impulse and Conservation of Energy in Bouncing Ball Collisions

    I don't know why I'm getting the wrong answer on this one. A 5.00kg ball is dropped from rest from 1.20m above the floor. The ball rebounds .700m. What are the magnitude, and direction of the impulse or the net force applied to the ball during the collision with the floor? So I started by...
  22. J

    Calculating change in angle from an impulse force

    say there was a rifle that pivoted about the center of its butt.. if you knew the force from the bullet, the weight of the gun and its center of mass, the distance from the center of the barrel to the center of the butt, and the distance from the center of gravity and the center of the butt...
  23. T

    Impulse and Momentum of a collision between a block and bullet

    The question is "A 2 kg block initially hangs at rest at the end of two 1-meter strings of negligible mass. A .003 kg bullet, moving horizontally with a speed of 1000 meters per second, strikes the block and becomes embedded in it. After the collision, the bullet/block combination swings upward...
  24. S

    Calculating Impulse Without Force or Time

    I am stuck on a part of my physics hw, please help if you can "Object A has mass mA = 7 kg and initial momentum vector pA,i = < 17, -8, 0 > kg · m/s, just before it strikes object B, which has mass mB = 11 kg. Just before the collision object B has initial momentum vector pB,i = < 3, 5, 0 > kg...
  25. Y

    Calculating Momentum Change with an Impulse of 25 N~s

    if an impulse of 25 N~s results, how would one describe the change in momentum? how is that number related or indicative of the change in momentum? i could be way off. that's likely. thanks.
  26. T

    One more impulse problem Hopefully

    a good bunter pulls the bat back right as contact is made with the ball. Why is this so? 1 This action decreases the impulse of the bat on the ball 2 This action increases the impulse of the bat on the ball 3 This action increases the average force of the bat on the ball 4 This action...
  27. T

    Which Has Greater Impulse: Sand or Water?

    Jumping onto sand vs. jumping into water results in which of the following as each substance brings you to a halt? a) The sand exerts a greater impulse than the water b) The water exerts a greater impulse than the sand c) The sand and water exert the same impulse, but the sand exerts a...
  28. K

    Momentum and Impulse during a collision

    A 500 g cart is released from rest 1.0 m from the bottom of a frictionless, 30 degree ramp. The cart rolls down the ramp and bounces off a rubber block at the bottom. The figure shows the force during the collision. Here's what I did. Which is probably wrong for the very first part so...
  29. Y

    Impulse and momentum of a cart down a ramp

    Question: A 500 g cart is released from rest 1.0 m from the bottom of a frictionless, 30 degrees ramp. The cart rolls down the ramp and bounces off a rubber block at the bottom. During collision, the cart and the ramp are in contact for 0.0267 sec. The average force exerted by the ramp on the...
  30. S

    Impulse, Momentum, and Baseball

    A baseball has mass 0.145 kg. A. If the velocity of a pitched ball has a magnitude of 45.0 m/s and the battered ball's velocity is 55.0 m/s in the opposite direction, find the magnitude of the change in momentum of the ball. delta p = m*delta v = m*(v2 -v1) = .145 kg (-55.0 m/s - 45.0...
  31. S

    Impulse Momentum Theorem and space probe

    Hi, I'm kinda lost on these 2 problems. A space probe is traveling in outer space with a momentum that has a magnitude of 7.15 x 107 kg·m/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.81 x 106 N and a direction opposite to the...
  32. R

    HELP Impulse Response h(t) problem

    HELP! Impulse Response h(t) problem Please help me solve this problem. Atleast the correct answer indication is also very much appreciated. Compute the impulse response h(t) for (dy(t))/dt -4y(t)=x(t) a. y(t) = e^4t b. y(t) = 1- e^4t c. y(t) = e^-4t d. y(t) = 1- e^-4t Compute the impulse...
  33. M

    What is the impulse delivered by a bat to a baseball after contact?

    A 0.14 kg baseball moves toward home plate with a velocity vi = (-37 m/s) x. After striking the bat, the ball moves vertically upward with a velocity vf = (13 m/s) y. Find the direction and magnitude of the impulse delivered to the ball by the bat. Assume that the ball and bat are in contact for...
  34. M

    Impulse function applied to RLC circuit

    Hello, I've been reviewing some material from my undergraduate studies. In the book "Signals and Systems" by Haykin in the first chapter he gives an example of a voltage source with the value of Vo*delta(t) applied to a series RLC circuit. Vo is some arbitrary constant and delta(t) is the...
  35. P

    Impulse and Momentum change

    A 300 g ball with a speed v of 6.0 m/s strikes a wall at an angle of 30 degrees, and then rebounds with the same speed and angle. It is in contact with the wall for 10 ms. (a) What is the impulse on the ball from the wall? (b) What is the average force on the wall from the wall? What...
  36. M

    How do I calculate the impulse

    If I'm given an object with X mass that is moving in one direction at Y velocity, then changes direction and moves at Z velocity, how do I calculate the impulse? Most equations I have are concerned with time intervals; this one is not.
  37. D

    Understanding the concept of impulse

    Hey. I am having a little trouble understanding the concept of impulse. The textbook i am using doesn't really shed much light onto the topic. I know that impulse is equal to the change in momentum of an object, or the product of a force applied to an object and the time it is applied for...
  38. P

    Momentum, impulse, and power definitions

    Hey, This may seem as stupid query for you people out there, but I would like to know if somebody would be able to spare a moment or two in explaining to me what the terms: momentum impulse power mean/refer to in the study of kinematics. Thank you heaps for your kindness, time and effort...
  39. P

    Impulse Response: Understanding & Applying Maths

    This thread would've fitted in a lot of categories, but as it's the mathematics I can't quite grasp, I decided to fit it here. I'll be treating the discrete case, so I suppose it's precalculus maths. Anyways, I know how to compute problems with the impulse response method, but I'm kinda baffled...
  40. K

    Collision and Impulse, Linear Momentum

    can someone help? I have no isea how to do this problem. A force in the negative direction of an x-axis is applied for 21 ms to a 0.40 kg ball initially moving at 10 m/s in the positive direction of the axis. The force varies in magnitude, and the impulse has magnitude 32.4 Ns. (a) What is...
  41. S

    Impulse on a Spinning Stick

    Problem: An upright rod of mass m and length L is given an impulse J at its base, 45 degrees above the horizontal, which sends the rod flying. What value should J have for the rod to land vertically again (i.e. upright on the same end at which J was applied)? I'm trying to learn from Feynman's...
  42. A

    SHM: Impulse applied to two masses connected by spring

    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...
  43. W

    Force of Steel Ball Impacting Steel Plate | Average Force Explained

    A 56g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for .5 ms. The ball rebounds elastically, and returns to its original height. The time interval for a round trip is 8.00 s. In this situation, the average force...
  44. M

    Angular impulse and angular momentum questions

    Hi everyone, I am stuck on two fairly easy questions that I hope someone will be able to help me with. Questions: 1) How much angular impulse must be supplied by the hamstrings to bring a leg swinging at 8 rad/s to a stop, given that the leg's moment of inertia is 0.7 kg-m^2 ? my...
  45. S

    Differential equations: impulse function

    How do you go about taking the Laplace transform of something like... \delta (t-1)sin(t) What does this even mean?
  46. S

    Impulse and Momentum: Substitution Trouble

    Ok, in this problem I am getting bogged down in the basic algebra part of it. I had one person explain it once but I still missed something.:frown: a 1055-kg van, stopped at a traffic light, is hit directly in the rear by a 715-kg car traveling with a velocity of +2.26 m/s. Assume that the...
  47. F

    How Does Particle B's Movement Depend on Particle A's Velocity Direction?

    6. Two particles, each of mass m, are connected by a light inextensible string of length 2l. Initially they lie on a smooth horizontal table at points A and B distant l apart. The particle at A is projected across the table with velocity u. Find the speed with which the second particle begins to...
  48. S

    Impulse in a flywheel-to-flywheel situation

    Cognitive superiors, I am trying to calculate the maximum torque that a flywheel of a given angular momentum can output when "instantaneously" ( I think this is my problem ) connected to another flywheel. From what I can see it seems that as the time taken to couple the flywheel to the...
  49. N

    Calculating Time of Force Application in Non-Uniform Motion

    A 230N force causes a 4.0kg to accelerate from 5.0m/s North to 3.0m/s east. for how much time does hte force act? t = m(vf-vi) / F i got this but the trouble is vf and vi are in different directions...and since t is not a vector i can't break it down to components. what should i do?
  50. C

    Impulse Matching: Finding the Unit Impulse Response

    Impulse Matching In regards to finding the unit impulse response of a system. We assume that x(t) = \delta (t) and that the intials conditions at t=0^_ are all zero. The impulse response h(t) therefore must consists of the systems's modes for when t \geq 0^+. But why is it that h(t) = A...
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