Impulse Definition and 935 Threads

I have an interesting problem. I am involved in a historical fencing group which uses blunted swords to thrust with (think fencing foils and épées, but heavier and stiffer, with a rubber blunt on the end). We've been discussing various new weapons and needed to address safety. I decided to...

Homework Statement 1. An Aircraft Space 1000 kg moving with speed (2000 i m / s). A meteor strikes the plane so that speed become (2000 i + 2000 j m / s). how impulses collision? 2. A 0.5 kg ball collides with the ball perfectly Resilience The second is silent. The second ball away with half...

Homework Statement Hi, need some help trying to understand calculus derivation of the rocket equation. If someone who be so kind as to look at the attachment where it is all laid out. Homework Equations All equations are listed in the attachmentThe Attempt at a Solution I have had a good go...

Homework Statement Peter, a 100 kg basketball player, lands on his feet after completing a slam dunk and then immediately jumps up again to celebrate his basket. When his feet first touch the floor after the dunk, his velocity is 5 m/s downward; when his feet leave the floor 0.50 s later, as...

Definition/Summary Force = impulse per time: \mathbf{F}\ =\ d\mathbf{I}/dt. For constant force, impulse = force times time: \mathbf{I}\ =\ \mathbf{F}\,\Delta t (by comparison, work done = force "dot" distance: W\ =\ \mathbf{F}\cdot \Delta\mathbf{s}). For varying force, impulse is the...

Homework Statement A child's hoop of mass M and radius b rolls in a straight line with velocity v. Its top is given a light tap with a stick at right angles to the direction of motion. The Impulse of the blow is I. a. Show that this results in a deflection of the line of rolling by angle...

Homework Statement hi all, why the wave is reflected back form the centre when it is at the distance of 200mm? why the wave can't go beyond 200mm to reach 250mm from the side of bowl? Homework Equations The Attempt at a Solution

Here is the problem. A rocket of mass m is in a circular orbit around the Earth at a distance R from the center. (a) What tangential impulse, mΔv, must be given to the body so that it just escapes to infinity? My attempt: I set the problem in terms of energy...

Homework Statement Suppose you are standing on the edge of a dock and jump straight down. If you land on sand your stopping time is much shorter than if you land on water. Using the impulse-momentum theorem as a guide, determine which one of the following statements is correct: a) In...

Homework Statement A 0.3-kg ball falls from a height of 30 m from rest and rebounds with half its velocity upon impact with a sidewalk. Find (a) the momentum delivered to the Earth and (b) the impulse delivered to the earth. Homework Equations FΔt= mvf-mviThe Attempt at a Solution What I tried...

Pressure problem -- Impulse of object striking a head 1. A police crime lab is trying to determine whether someone was murdered or died as a result of an accident. He was struck in the temple by a 4.20 kg sculpture that is alleged to have fallen off a bookcase. The sculpture presumably fell a...

Homework Statement A 60.0 gram tennis ball is served at 45.0 m/s and is returned with an average force of 100 N over 50 ms. Find the speed with which the ball is returned. Assume the ball is still moving at 45.0 m/s when it is returned. Homework Equations Impulse = Average Force * time...

Homework Statement Two space shuttles owned by two different countries go to space. Their engines are closed, and are moving from impulse towards Mars. The shuttles are separated by big springs. The first shuttle, has a mass of 1,5 x 10^4 kg and a velocity of 3,5x10^3km/h at 5,1degrees in...

A 1,000kg car traveling with a velocity of +20.0meters per second decelerates uniformly at -5.00 meters per second per second until it comes to rest. What is the total distance the car travels as it decelerates to rest? What is the magnitude of the impulse applied to the car to bring it...

Homework Statement https://scontent-a-sjc.xx.fbcdn.net/hphotos-frc1/l/t1.0-9/10155336_1407954212814131_2465716609293795371_n.jpg Homework Equations ∫Fdt = mvf-mvi The Attempt at a Solution I have tried integrating kxcdt from 0 - .01 and haven't had any luck. I am not quite...

Homework Statement A 1343 kg car experiences an impulse of 30,000 N during a collision with a wall. If the collision takes 0.43 s, what was the velocity of the car just before the collision? A) 22 m/s B) 9 m/s C) 51 m/s D) 18 m/s Homework Equations F=dp/dt p=mv The Attempt at...

I have seen modern steam turbines with velocity compounding, they start with impulse stage then reaction stages,can anyone tell me, why There is a impulse stage first,why not a reaction stage first?

Homework Statement https://scontent-a-sjc.xx.fbcdn.net/hphotos-prn2/t1.0-9/10167935_1403417599934459_6123061969742894932_n.jpg Homework Equations The Attempt at a Solution I used ∫Fdt = m(vf-vo) and came up with -.822 m/s for the final velocity... I have been reworking this...

Homework Statement a ball having a mass of 150 g strikes a wall with a speed of 5.2 m/s and rebounds with only 50% of its initial kinetic energy. what is the magnitude of the impulse on the wall from the ball? Homework Equations I=Ft I=ΔP KE= 1/2 m v^2 The Attempt at a Solution...

Hi, I was reading about VASIMR ,my knowledge in rocket science is very limited ,i was able to understand how plasma is produced and used for propulsion but i didn't understand how specific impulse is varied and why is it not possible for other (ion)thrusters or even chemical ones to vary the...

Homework Statement A homogene rod with length "l" is placed vertically, and a nail is stabbed on the top of the rod (now the rod has an axis). And then an impulse is given on the rod with the separation between the impulse given to the rod's axis is "d". Earth gravitational acc is represented...

A homogene rod with length "l" is placed vertically, and a nail is stabbed on the top of the rod (now the rod has an axis). And then an impulse is given on the rod with the separation between the impulse given to the rod's axis is "d". Earth gravitational acc is represented as g, the mass of the...

I am very confused on these questions...help please :) stuff in () is what I think the answer is but am not sure. A 100 kg cart and a 200 kg cart move toward each other. The 100 kg cart initially moves at +5 m/s while the 200 kg cart moves at -10 m/s. 1. What is impulse in terms of...

First post here. This question has two parts. (1) Connecting the dots between the Impulse-Momentum Theorem and the Law of Conservation of Momentum and (2) Book recommendations for a more theoretical treatment of classical mechanics? (1) Difficulty reconciling the Impulse-Momentum Theorem...

Homework Statement A baseball with a mass of 0.125 kg is moving horizontally at 32.0 m/s [E], when it is stuck by a bat for 0.00200 seconds. The velocity of the ball just after the collision is 52.0 m/s [W 20 N]. Homework Equations p = m Δv Fnet = ∆p/∆t there are also these...

Homework Statement You are riding in a car that crashes into a solid wall. The car comes to a complete stop without bouncing back. The car has a mass of 1500 kg and has a speed of 30 m/s before the crash. (this is about 65 mi/hr). What is the net impulse that acts on the car to bring it to...

##\varphi(p)=\frac{1}{\sqrt{2\pi\hbar}}\int^{\infty}_{-\infty}dx\psi(x)e^{-\frac{ipx}{\hbar}}##. This ##\hbar## looks strange here for me. Does it holds identity ##\int^{\infty}_{-\infty}|\varphi(p)|^2dp=\int^{\infty}_{-\infty}|\psi(x)|^2dx=1##? I'm don't think so because this ##\hbar##. So...

Homework Statement The pendulum of a grandfather clock activates an escapement mechanism every time it passes through the vertical. The escapement is under tension (provided by a hanging weight) and gives the pendulum a small impulse a distance l from the pivot. The energy transferred by...

Homework Statement I am having some problems to derive Inverse Fourier transform of sinc function & exponential function. It's actually for getting the Impulse response from the given frequency response [which comprises of both sinc function & exponential function]. Also need to know the...

Homework Statement Given the graph (see picture), determine: a) magnitude of impulse (max error of +/- 25%) b) direction of impulse c) mass of the object that the impulse acted on. Note that initial velocity is 3.8 m/s to the west and that final velocity is 4.8 m/s to the east. Homework...

A racquet ball with mass m = 0.245 kg is moving toward the wall at v = 15.4 m/s and at an angle of θ = 28° with respect to the horizontal. The ball makes a perfectly elastic collision with the solid, frictionless wall and rebounds at the same angle with respect to the horizontal. The ball is in...

Homework Statement A particle receives an impulse that lasts 1s, coming from a upwards vertical force. This force is given by the following equation: F = -8t²+8t. What is the maximum height reached by the particle?Homework Equations F = -8t²+8t The Attempt at a Solution \int(-8t²+8t)dt =...

Homework Statement A force that averages 1200N is applied to a 0.4kg steel ball moving at 14m/s in a collision lasting 27ms. If the force is in a direction opposite the inital velocity of the ball ,find the final speed and direction of the ball Homework Equations n/a The Attempt at...

Homework Statement An ice hockey player receives a pass so that the puck, with a velocity of 18 m/s, glides across the ice, perpendicularly to the side axis (translation?) of the rink. After a slap shot, the puck moves exactly parallel to side axis of the rink, towards the goal with the...

Hello, I am posting this here becase this is not a homework, it;s just something I need to know. Please tell me what these two waveforms mean? I know that they're both lightning impulse waveform but what is the difference between those two, what gives them their shapes?

Homework Statement The problem is shown below. Homework Equations Conservation of momentum? pi = pf ∫Fdt = I ? The Attempt at a Solution This question is really strange. I have started to do this question for many hours and I don't know how to start it. I have tried to list...

Hello, Homework Statement You throw a 0.500 kg rock underhand, as shown in the diagram. The rock starts at rest from the lowest point moving at an angle of 40° above the horizontal, and leaves your hand 0.300 s later having traveled 1.20 m. What is the average force that you exert on the...

Homework Statement A ball of mass m= .25kg is moving with an initial velocity of \vec{v}=(8.0\hat{x}+8.0\hat{y})(m/s). It rebounds from a wall and has a final velocity (after impact) of \vec{v}= (-5.0\hat{x}+6.0\hat{y})(m/s) a.) Determine the impulse exerted on the ball by the wall...

y(n) = a * y(n-1) + K * b * x(n-1) + K * x(n), where |a| < 1. (a) Calculate its impulse response, h(n). the homogenous equation is l^n-1(l-a) = 0 => 1 = a so h(n) = [ka^n ] u(n) (b) Calculate its step response. I can't seem to find any examples online and my book says nothing...

Homework Statement Consider the frequency response H(e^jw) = e^j3w(5 + cos(w) + 2cos(w)). Find the impulse response h[n]. Homework Equations H(e^jw) = Ʃ(from k = 0 to M) bk * e^-jwk = Ʃ(from k = 0 to M) h[k] * e^-jwk The Attempt at a Solution So I'm not sure at all how to get...

I think I almost got this problem would you review or correct me please?: A spring with a spring constant k=34/Nm is attached to a block of mass M1=1.5kg. Initially that block is at rest on a friction less surface. A second block, M2, of mass of 4.5kg is moving with speed v= 5.5m/s toward the...

A 0.14 kg baseball moves horizontally with a speed of 29 m/s toward a bat. After striking the bat the ball moves vertically upward with 46% of its initial speed. Find the direction and magnitude of the impulse delivered to the ball by the bat. Find the ° (measured from the initial direction...

Sorry if I am posting this in the wrong place but this is my first post. I know the equation for tipping of a block when force is slowly added until it either tips of slides is umg=mgL/2h but I have noticed that when you quickly strike the block with your finger, the point at where the block...

Ok, so I start out with the basics and find k. F=ma=kx (1.5 kg)(9.8 m/s^2) = k (4.9 m) k = 3 N/m I also know from the problem that c=0 (no damping) and x(0) = 2m and x'(0) = 0. ƩF = ma ma = -cx' - kx, a = x'' mx'' + cx' + kx = 0 and since c=0 mx'' + kx = 0 Nothing out of the...

Solving differential with a step impulse. Hi, I have problem I know I should be able to do but I've been stuck on it for a while. Just looking to be pointed in the right direction. (dq^2/d^2t) + 2*ζ*ω*dq/dt + (ω^2)*q = u(t)/L Where u(t) is a step impulse, q is the charge through an...

Momentum impulse physics question, HELP ASAP please! Homework Statement A 4.0-kg block slides along a frictionless surface with a constant speed of 5.0 m/s as shown. Two seconds after it begins sliding, a horizontal, time-dependent force is applied to the mass. The force is removed eight...

can someone explain to me how to start on this problem A volleyball is spiked so that its incoming velocity of +4.1 m/s is changed to an outgoing velocity of -18 m/s. The mass of the volleyball is 0.44 kg. What impulse does the player apply to the ball?

Homework Statement A football player whose mass is 85 kg throws a football with a mass of 0.8 kg against a post. The football hits the post traveling horizontally with a speed of 25 m/s, and then it bounces back with about the same speed. The football is in contact with the post for 0.05 s...

Which of the following is true if the mass is at rest at t=0 ? A. Velocity of the mass is decreasing btwn 10 and 20 seconds. B. The accel. of the mass is constant between 0 and 10 seconds C. At 40 seconds the mass is stationary. D. The distance trsveled by the mass bten 0 and 10 seconds is...

In nanoscale electronics, electrons can be treated like billiard balls. The figure shows a simple device currently under study in which an electron elastically collides with a rigid wall (a ballistic electron transistor). The green bars represent electrodes that can apply a vertical force of...