Impulse Definition and 905 Threads

Homework Statement To make a bounce pass, a player throws a 0.60 kg basketball towards the floor. the ball hits the floor with a speed of 5.4m/s at an angle of 65o to the vertical. The ball rebounds elastically with the same speed and angle. Calculate impulse (magnitude and direction) delivered...

Homework Statement A rubber ball (mass 0.26 kg) is dropped from a height of 1.7 m onto the floor. Just after bouncing from the floor, the ball has a speed of 3.6 m/s. (a) What is the magnitude and direction of the impulse imparted by the floor to the ball? Magnitude ? kg · m/s (b) If...

Homework Statement A 2.00X10^2 kg(200kg) shot is discarded horizontally from a cannon of mass 2.0x10^4kg(20000), with a speed of 250 m/s relative to ground. Find steady force which, acting on the cannon, will stop its recoil in 2.0s and How far will cannon recoil Homework Equations...

Homework Statement To basketball player bounces the 0.60-kg basketball to another player by bouncing it off the court. The ball hits the court with a speed of 6.5 m/s at an angle of 50° from the vertical. If the ball rebounds with the same speed and angle, what was the impulse delivered to...

Homework Statement mass of steel ball = 40g = .04 kg h1 = 2.00 m h2 = 1.60 m A steel ball is dropped from height of 2.00 m onto horizontal steel slab, rebounds to height of 1.60m. Calculate impulse of ball during impact. Homework Equations impulse J = F*dt J = P2 - P1 I tried...

I can't seem to master this equation, because I think I'm doing things right and I'm not. Homework Statement When a 410 baseball gram is hit, its velocity changes from +28.87 m/s to -22.34 m/s. The baseball is in contact with the bat for 56.10 milliseconds. You may assume that the balls...

Show that the kinetic energy of an object can be written in terms of the momentum as KE = p^2/2m. Homework Equations KE = 1/2MV^2 The Attempt at a Solution To be honest, I don't know where to even start with this problem. It equals PV/2 but I still need to find a way to derive p^2/2m

I messed up on the title of the thread.. I had a few questions but ended up solving them on my own. The only question I have is how to solve this ODE. Thanks. Homework Statement Solve the ODE (dx/dt)= f(t) - .1x Where f(t) = 2+sin(t)2. The attempt at a solution I faintly remember doing...

Homework Statement A baseball player hits a baseball (m = 0.145 kg) as shown in the figure below. The ball is initially traveling horizontally with speed of 35 m/s. The batter hits a fly ball as shown, with a speed vf = 51 m/s. What is the magnitude and direction of the impulse imparted on the...

Homework Statement A 231.0 g ball is dropped from a height of 2.60 m, bounces on a hard floor, and rebounds to a height of 1.37 m. The impulse received from the floor is shown below. What maximum force does the floor exert on the ball if it is exerted for 2.00 ms? Homework Equations Jx =...

Homework Statement A paratrooper fell 375 m from an airplane without being able to open his chute. Assume that his speed at impact was 52 m/s (terminal speed), that his mass (including gear) was 85 kg, and that the force on him from the snow was at the survivable limit of 1.2 multiplied by...

Homework Statement A paratrooper fell 375 m from an airplane without being able to open his chute. Assume that his speed at impact was 52 m/s (terminal speed), that his mass (including gear) was 85 kg, and that the force on him from the snow was at the survivable limit of 1.2 multiplied by...

Homework Statement An 8-g bullet is shot into a 4.0-kg block, at rest on a frictionless horizontal surface. The bullet remains lodged in the block. The block moves into a spring and compresses it by 3.0 cm. The force constant of the spring is 1500 N/m. Find the initial speed of the bullet...

Homework Statement Calculate the impulse (in kg m/s) received by a football when it is kicked in a kickoff. The ball has a mass of 0.259 kg and travels a horizontal distance of 46 m. The ball is kicked at an angle of 47 degrees with the horizontal...

1. Find the impulse response h(t) given: z'(t) + 4z(t) = 4x(t) 2. The attempt at a solution I first decided to divide through by 4 (1/4)z'(t) + z(t) = x(t) since we are looking for impulse response I made the following substitutions: let z(t) = h(t) let x(t) = dirac(t)...

Hello very body i got confused understanding how we can get the derivative of V(t) equal to Hv(t) : V= (1/R) e^(-t/RC) U(t) its derivative V' = Hv(t) = -(1/R²C)e^(-T/RC) U(t) +(1/R)&(t) where : U(t) is the unite step fonction and &(t) is the delta fonction please some help thanks for...

Homework Statement A playerbounces a basketball on the ground. If the ground exerts a force F = 10N on the ball in 0.1 seconds, what is the impulse on the basketball. If the ball is simply dropped from a height of 2m, assuming the impulse to be the same as before, what is the basketball's...

Homework Statement In the figure , what value of F_max gives an impulse of 6.8 Ns? http://img76.imageshack.us/img76/1782/09ex05.jpg Homework Equations Integral of F with respect to time equals impulse The Attempt at a Solution I tried doing two things, and they were both wrong...

Homework Statement y(t) = \int ^{t}_{-\infty} e^{-(t-\tau)} x(\tau-2)d\tau Find h(t), given that the continuous time linear time invariant signal has input x(t) and output y(t). 2. The attempt at a solution I was wondering if I can simply manipulate the expression until i get it in the...

Work is the integral of force over a certain distance, impulse the integral of a force over a certain time span. A derivative tells us how fast something is changing at a certain point, an integral tells us how much something has changed up until that point, is this generally true (an integral...

In what kind of instances would the quantity of impulse be used? My textbook says that it's when very large forces act for very short times but how would that help us calculate the force OR the time?

Homework Statement From Cutnell & Johnson PHYSICS 7th Edition Textbook - Ch 7 / Problem #1 One average force F1 has a magnitude that is three times as large as that of another average force F2. Both forces produce the same impulse. The average force F1 acts for a time interval of 3.2...

Homework Statement A 2.5 g bullet, traveling at a speed of 425 m/s, strikes the wooden block (mass = 215 g) of a ballistic pendulum. (A) Find the speed of the bullet/block combination immediately after the collision. (B) How high does the combination rise above its initial position...

Mainly, I'm only curious about the nifty device's function for reading "brain waves" shown at 5:00 in this video: It only cost like 120 bucks. What do you folks think? Are there any neuroscientists on here that know if the readings are accurate enough for amateur analysis on one's self...

Magnitude of Acceleration after initial impulse? Homework Statement A block with a mass of m = 3.04 kg is at rest on an incline. The angle of the incline is θ = 20.3° with respect to the horizontal. The coefficient of static friction between the object and the incline is μs = 0.645, the...

-------------------------------------------------------------------------------- Ive been trying to get my head around an equation for seatbelts. Hyperphysics has an auto calculator and I've been trying to do it algebraically and still cannot get the same answer. Here is what i have...

Homework Statement a 0.144kg baseball is pitched horizontally at +38m/s. after it is hit by a bat, the baseball moves horizontally at -38m/s. a) what impulse did the bat deliver to the ball b) if the bat and the ball were in contact for 8.0*10^-4 seconds, what was the average force that...

If body A exerts an impulse of say +2Ns on B, then does body A exert an impulse of -2Ns on B providing no external forces act? Thanks

Hello everyone, I have a question which I have no idea how to work out. Question: During a collision between two cars, a passangers head strikes an unpadded dashboard with an average force of 48N. This force is exerted for 3x10-3s. If suitable padding had been present the impact would have...

Homework Statement This is an MCAT practice problem that is driving me crazy! The answer is supposed to be 2200N on each foot. Any help would be much appreciated! Thanks in advance! A guy, whose mass is 80 kg, jumps off a bench that is 1 meter off the ground. Immediately after landing...

Homework Statement A railroad hopper car has a mass of 30000 kg when empty and contains 50000 kg of coal. As it coasts along the track at 5 m/s the hopper opens and steadily releases all the coal onto a platform below the rails over a period of 4 s. What is the horizontal impulse delivered to...

Homework Statement 1 mass M1 of 1 kg moves frictionless at V1 1 meter per second to the right. It fuses with mass M2 of 2 kg and together they keep moving frictionless to the right. What is the speed V2 of the fused objects? Homework Equations Impulse mass * Velocity Kinetic energy...

I have a question that annoys my basic understanding of kinetic energy. I know if I have a force-time plot then the area under the curve is equivalent to the impulse imparted on an object (in units Newton-Seconds). I know that this is also equivalent to the change in momentum of the object...

hello I'm struggling with physics this year at school i found this site looks great :smile: if this is a bad 1st post i won't be to surprised :biggrin: any way here's my problem... Homework Statement A Car A (with a mass of 750Kg) is travailing at 30 m s-1 and collides head on with car B...

Homework Statement A 0.2 kg particle moves in the x-y plane under the action of its weight and a force F that varies with time. The velocity of the particle is given by the expression \hat{v} = 7.5(t2 + 3)\hat{i} - (10/3)(t3 - 4)\hat{j} Homework Equations mv1 + \sum\intFdt = mv2...

Homework Statement A bullet of mass 0.010 kg and speed of 100 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. This process takes 0.02 seconds. Theblock remains stationary during this process. a. what is the magnitude of the impulse delivered to the bullet...

The first Question A 2.5 kg ball and a 5.0 kg ball have an elastic collision. The 2.5 kg ball was at rest and the other ball had a speed of 3.5 m/s. What is the kinetic energy of the 2.5 kg ball after the collision? Homework Equations J=p (Impulse = momentum) (F)t= m2v2f+m1v1i...

Homework Statement During Operation the jack hammer develops on the concrete surface develops a force @ t=0 f=0, @ t=.2, F=90, @ t=.4, F=0. Graph looks like a triangle To achieve this the 2lb spike S, is fired from rest into the surface @ 200ft/s. Determine the speed of the spike just...

Can someone give me quick refresher on what happens when you multiply the heaviside function with the unit impulse? Typically, the unit step function multiplied by anything simply delays it by the offset in the unit step function. The unit impulse function makes the value defined at only one...

Homework Statement A grenade of mass 10kg explodes into three pieces in the same plane, two of which, A(5.0kg) and B(2.0kg), move off as shown. Calculate the velocity of the 3.0 kg third Piece, C Homework Equations Pt=Pt' The Attempt at a Solution I do not get the right answer...

Homework Statement What is the impulse needed to stop a 10kg bowling ball moving at 5m/s? Homework Equations Impulse = -initial momentum and momentum = mass * v = 50 The Attempt at a Solution I entered -50 as the answer but it was wrong :( can someone please help me?

A golfer hits a golf ball of mass 0.045 kg the ball over some short trees. He hits the ball at an angle of 600 to the horizontal and it travels a horizontal distance (Range) of 60.0 m in a time of 8.00 s. The golf club of mass 0.60 kg is in contact with the ball for a time of 2.40 ms. (a)...

Homework Statement A golfer hits a golf ball of mass 0.045 kg the ball over some short trees. He hits the ball at an angle of 60(degrees) to the horizontal and it travels a horizontal distance (Range) of 60.0 m in a time of 8.00 s. The golf club of mass 0.60 kg is in contact with the ball...

Homework Statement Suppose a gangster sprays Superman's chest with 3 g bullets at the rate of 100 bullets/min, and the speed of each bullet is 500 m/s. Suppose too that the bullets rebound straight back with no change in speed. What is the magnitude of the average force on Superman's...

How come these two functions are used interchangebly? A sampling function is supposed to be a square wave with a very small duty cycle, but at least the height is still finite. A delta function has infinite height and zero width. It seems like both square wave and dirac train are used as...

Homework Statement Block A (2.1kg) is moving at 7.8 m/s to the right and collides head on with block B (3.4kg), which is moving at 4.2 m/s to the left. a) What is the velocity (magnitude and direction) of the blocks after the collision, if the two blocks stick together? b) What is the...

Homework Statement Until his seventies, Henri LaMothe excited audiences by belly-flopping from a height of 12 m into 30 cm of water. Assuming that he stops just as he reaches the bottom of the water and estimating his mass, find the magnitude of the impulse on him from the water. Homework...

Car makers build in many safety features to their cars. Some advertise these features a great deal so that many people will have heard of 'crumple zones' and 'rigid steel safety cage'. Seat belts have also lead to increased safety. The crumple zone in a car are the engine compartment and the...

Homework Statement A 2.18 kg steel ball strikes a massive wall at 12.6 m/s at an angle of a = 55.1o with the plane of the wall. It bounces off with the same speed and angle (as seen in the figure below). If the ball is in contact with the wall for 0.152 s, what is the average force exerted...

Homework Statement Until he was in his seventies, Henri LaMothe excited audiences by belly-flopping from a height of 10 m into 31 cm. of water. Assuming that he stops just as he reaches the bottom of the water and estimating his mass to be 80 kg, find the magnitudes of the impulse on him from...