Impulse Definition and 935 Threads

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 uniform solid disk with radius 6 cm has mass 0.8 kg (moment of inertia I = ½MR2). A constant force 12 N is applied as shown. At the instant shown, the angular velocity of the disk is 30 radians/s in the -z direction (where +x is to the right, +y is up, and +z is out of the...

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...

Homework Statement plot using matlab: g = 3 cos (10pi t) convolved with 4 impulse (t +0.1) Homework Equations The Attempt at a Solution x = -10:0.1:10; u = 3*cos (10*pi*x); v = 4*dirac(x + 1./10); y = conv (u,v); plot (x,y); but i keep getting this error: Error using ==>...

Homework Statement A 7.0 kg toy car can move along an x axis; Figure gives Fx of the force acting on the car, which begins at rest at time t=0. The scale on the Fx axis is set by Fxs = 6.0 N. In unit-vector notation, what is p at (a)t = 1.0 s and (b)t = 6.0 s,(c) what is v at t = 9.0 s...

If my rocket has two rocket engines going off each at an impulse at 20.00 N/S... If my rocket has two rocket engines going off each at an impulse at 20.00 N/S, then would the total amount of impulse my rocket has be 40.00 N/S? Please answer seriosuly only this is extremely important and...

Homework Statement A 41 rubber ball is dropped from a height of 1.8 and rebounds to two-thirds of its initial height. http://session.masteringphysics.com/problemAsset/1070447/4/09.P29.jpg The figure (Part C figure) shows the impulse received from the floor. What maximum force does the...

Homework Statement A 0.40 kg soccer ball approaches a player horizontally with a velocity of 18 m/s to the north. The player strikes the ball and causes it to move in the opposite direction with a velocity of 24 m/s. What impulse was delivered to the ball by the player? Answer in units of kg ·...

Homework Statement A 68.0 kg bungee jumper, tied to a 31.0 m long cord, leaps off a bridge whose deck is 61.0 m above the water. He falls to 7.0 m above the water before the bungee cord pulls him back up. What is the magnitude of the impulse exerted on the bungee jumper while the cord...

Homework Statement 1. The force shown in the figure below is the net eastward force acting on a ball. The force starts rising at t=0.012 s, falls back to zero at t=0.062 s, and reaches a maximum force of 35 N at the peak. Determine with an error no bigger than 25% (high or low) the magnitude...

I'd be grateful if someone could help me with the problem below: A free-floating uniform cube with sides of length 2 is at rest, aligned with the coordinate axes, when it is subjected to an impulse along one edge of 3m, where m is its mass. What is the effect on its motion? (Its inertia...

I would like an explanation with this formulas for a rocket engine and any other engine to calculate its exhaust velocity and its specific impulse. I realized that this formulas neglect combustion temperature, engine pressure, speed of the fuel is injected, etc. -----------------------------...

A 4kg wooden block resting on an icy surface (so friction can be ignored) is attached to a horizontal spring (L=1m, k=100N/kg), which is attached on the other end to a vertical wall. A 2g bullet is fired at a speed of 100m/s into the wooden block, pushing it directly toward the wall. What is...

Homework Statement A one-dimensional impulse force acts on a 3.0-kg object, as described in the graph below. http://qaboard.cramster.com/Answer-Board/Image/2006714849276328846376778312506582.jpg Find: (a) The magnitude of the impulse given to the object. (b) The magnitude of the...

Homework Statement A bullet with a mass of 0.005 kg and moving with a speed of 400 m/s penetrates a distance of 0.08m into a wooden block firmly attached to the Earth. Assume that the force stops it is constant. Compute for: a.) acceleration of the bullet b.) accelerating force c.) time...

Homework Statement A proton has mass 1.7 x 10-27 kg. What is the magnitude of the impulse required in the direction of motion to increase its speed from 0.995c to 0.998c? Homework Equations gamma=1/sqrt(1-(v/c)2) p=gamma*mass*velocity The Attempt at a Solution (1.7 x 10-27 * 15.82...

Homework Statement Two small steel balls A and B have mass 0.6 kg and 0.2 kg respectively. They are moving towards each other in opposite directions on a smooth horizontal table when they collide directly. Immediately before the collision, the speed of A is 8 m s–1 and the speed of B is 2 m...

Hey, I registered on here just for this question. I will be posting here regularly though. I want to know who discovered the formulas for momentum and impulse. That's all I really want to know. It would be nice if someone would reply to this, thanks.

Hello... new to the forum and not sure where to post, I see a warning everywhere lol Hope I'm not in the wrong spot. I haven't been in school in well over a decade, but I'm the kind of guy that went out and got math books on my own because I was jonsing to do some math... it's fun for me...

Homework Statement a tinnes ball of mass 150 gm moves with velocity 11.2 m/s to collide with a racket , after collision it is rebounded with vilocity 7 m/s ...find :-the impulse of the racket on the ball. Homework Equations I = m (delta) v what i want to know .. is when do we...

[b]1. The one sled has a mass of 2m and the other sled has a mass of m show that sled one with mass 2m has a momentum of root2 compared to the sled with mass m. The only formulas that i could think to use were p=mv and sigmaF=dp/dt and i can't seem to find a way to relate them to get an...

[SOLVED] Impulse and Momentum problem on skaters Homework Statement A 50.0-kg skater is traveling due east at a speed of 3.00 m/s. A 70.0-kg skater is moving due south at a speed of 7.00 m/s. They collide and hold on to each other after the collision, managing to move off at an angle theta...

Can anyone show me how to use impulse to solve any problem?

Homework Statement A ball is moving toward a batter at 32m/s and weighs 0.15kg. After the batter hits it goes 105.0m at an initial angle of 52 degrees. What is the magnitude of the impulse the ball receives in the collision with the bat, and what is the direction of the impulse? [b2...

Homework Statement A cue hits the billiard ball at the position shown. The collision lasts 90 ms with an average force of 420 N. If R = 7 cm, m = 300g, k = 0.1. (ignore friction during impact) *Didn't post the rest since they are irrelevant. Homework Equations J(angular) = (x*F*t)/I...