Final velocity Definition and 245 Threads

Homework Statement An 9.30 kg body moving at 9.30 m/s begins to decelerates uniformly. After 9.30 s the body is 9.30 m from the location were it started to decelerate. What is the final speed of the body 9.30 s after it started to decelerate? Homework Equations I'm not sure what...

Homework Statement A 75Kg skier starts down a 50m high 10˚ slope. What is his speed at the bottom? Part A: Consider skis frictionless Part B: Assume that the coefficient of kinetic friction between the skis and the surface of the slope is µk=.05Homework Equations |Ff|=µk•|FN|...

Homework Statement A rock is tossed straight up with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. What is the rock's velocity as it hits the bottom of the hole? Homework Equations V = Vo + at Y - Yo = Vot + .5at2 v2 = vo2 + 2a(Y - Yo) Y - Yo = .5(Vo + V)t...

Homework Statement Two balls roll towards each other. Ball A moves to the right with velocity 5 m/s and ball B moves to the left with velocity 3m/s. If both balls have the same mass, m=50kg, determine the final velocity of them if they move off together after collision. In which direction will...

Homework Statement A man pushes a chair that weighs 60N with a force of 25N. The chair has a final speed of 4.0m/s. and a kinetic friction of .27. What is the acceleration? Homework Equations i have no idea where to start, i tired this formula that had me find distance but the...

Homework Statement A car with a mass of 1000 kg traveling with a velocity of 15m/s east collides with a 1200 kg minivan traveling at a velocity of 20m/s north. After the collision the car and the minivan are stuck together. Draw to the scale the final velocity vector of the car and minivan...

Homework Statement 2.78 kg block is pulled (from rest) by a force (horizontal surface) of 15.8 N. The coefficient of kinetic friction is .106. What is the velocity after 2.88 m? Homework Equations fk=N(uk) Vf=sqrt((2*W)/m The Attempt at a Solution I attempted to find the final...

I need to be able to calculate the final velocity of an object accelerating towards a mass from a distnce with an initial velocity. From my little knowledge of calculus, I am only a junior in high school, i have figured out that this is probably a derivitive problem. But i have no knowledge of...

Homework Statement I'm going to be doing a lab, in which I am going to push a block down a ramp. So right now, the problem I'm going to ask is conceptual, and not actually with numbers. So basically, I need to find the theoretical acceleration, and the theoretical velocity. Then, I need...

final velocity...need help! Homework Statement An object is to be thrown through a window 3.25 m high a distance 8 m away. It is launched at an angle 75 degree above the horizontal. The initial launch speed at the specified angle which will allow the projectile to pass through the window is...

just a quick question! will the final velocity of a free falling object always be negative even if the answer is positive?

Homework Statement A train on a straight, level track has an initial speed of 35.0 km/h. A uniform acceleration of 1.50 m/s sq is applied while the train travels 200 m. (a) What is the speed of the train at the end of the distance? (b) How long did it take for the train to travel the 200m...

Homework Statement A 0.10-kg object moving initially with a velocity of 0.20 m/s eastward makes an elastic head-on collision with a 0.15-kg object initially at rest. What is the final velocity of the .10 kg object after the collision ? Homework Equations im not sure which equation to...

If this is in the wrong section, my apologies, but I'm wondering if it's possible, with known equations, to calculate the final velocity of matter accelerating into the event horizon of a black hole, and what those equations would be. I don't think this is an easy question, so any help is...

1. A spring with a spring-constant 3.6 N/cm is compressed 39 cm and released. The 9 kg mass skids down the frictional incline of height 36 cm and inclined at a 20◦ angle. The acceleration of gravity is 9.8 m/s^2. The path is frictionless except for a distance of 0.6 m along the incline which...

Homework Statement Two hockey pucks approach each other as shown in the figure below. Puck 1 has an initial speed of 21 m/s, and puck 2 has an initial speed of 14 m/s. They collide and stick together. Homework Equations The Attempt at a Solution The pucks didn't have a mass so I...

Hi all. New to the forums. Rookie to Physics. I know this is a really simple question, but I am struggling with it. Help would be greatly appreciated. Q: Determine the displacement of a plane that experiences uniform acceleration from 66 m/s to 88 m/s in 12s. Wouldn't I use...

1. Experiencing a constant horizontal 1.10 m/s wind, a hot-air balloon ascends from the launch site at a constant vertical speed of 2.50 m/s. At a height of 205 m, the balloonist maintains constant altitude for 10.0 s before releasing a small sandbag. What is the horizontal displacement of the...

Rearranging equations ! Homework Statement Rewrite the equations to solve for the following 1) final velocity 2) initial velocity 3)time interval Homework Equations Aav = Vf-Vi/t Aav is average acceleration Vf is final velocity Vi is initial velocity t is delta T which is the...

Homework Statement A photographer in a helicopter ascending vertically at a constant rate of 12.5 m/s accidentally drops a camera out the window when the helicopter is 60.0 m above the ground. -How long will it take the camera to reach the ground? What will its speed be when it hits? a= -9.8...

Homework Statement A baseball thrown at an angle of 65.0° above the horizontal strikes a building 18.0m away at a point 5.00m above the point from which it is thrown. Ignore air resistance. 1- find the magnitude of the initial velocity of the ball.-found 2- find the magnitude of the...

Homework Statement A ball is rolled down a rough hill with coefficient of \mu<tan\theta. The hill has a height of h. The ball has moment of inertia of I, mass of m, and radius of r, which are all constant. What is the final velocity of the ball at the bottom of the hill? P.S. I made this...

Homework Statement All right so this will probably sound a little muddled but I'll try anyway. We conducted a lab today in class. We were given a hot wheels car, a meter stick, a ramp, and a stopwatch. We were told to find final velocity of total distance. We were not told how to actually...

Homework Statement A small metal sphere, carrying a net charge of q_1 = -2.70 \mu C, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q_2 = -7.60 \mu C and mass 1.50 g, is projected toward q_{1}. When the two spheres are 0.800 \rm m...

Homework Statement Question: A motorcycle traveling at 40 ft/s is given an average acceleration of 4 ft/s^(2) for 10 s. Find the final velocity. Homework Equations Average Velocity= [displacement][/total travel time ] v= [[x][/2] - [x][/1]][/[t][/2]...

Homework Statement A student drops a ball from the top of a tall building; it takes 2.5 s for the ball to reach the ground. A.What was the ball’s speed just before hitting the ground? B.What is the height of the building? Homework Equations v=V(not) + at x=V(not)t + 1/2at(Squared)...

Homework Statement You have a 4kg block attached to a string with T=35N. If the block begins at 5m/s and is lowered 10m what is approxaimate final velocity of block? So I got the question right: Find Fnet and times it by 10m and set (Fnet)(10)= work = KE and find velocity from KE. But...

A spring with a spring-constant 3.4 N/cm is compressed 27 cm and released. The 9 kg mass skids down the frictional incline of height 13 cm and inclined at a 17◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a dis- tance of 0.5 m along the incline...

Trebuchet help! 1. Hi, I am writing a report for a trebuchet project, and trying to find the final velocity of the tennis ball, my teacher told us to just use this :F=m(v^2/r) for initial velocity. so I am really confused right now. I don't know how to find final velocity. Also, which equation...

Homework Statement A small block (mass m) slides down a circular path (radius R) which is cut into a large block (mass M), as shown. M rests on a table and both blocks slide without friction. The blocks are initially at rest, and m starts at the top of the path. Determine the velocity of m...

Homework Statement A 20kg object is on a 10 m long, 15 degree slope , that has a coefficient of friction that is 0.2 Calculate the time to slide down the final velocity at the bottom [b]2. Homework Equations [/b Fg=mag Fn=Fgcos(theta) Fp=Fgsin(theta) mu=Ff/Fn Fr=MAr The Attempt...

final velocity of a ball pushed by compressed air..pls. help! Homework Statement Compressed air is used to fire a 1.72 kg ball vertically upward from a 1.50 m long tube. The air exerts a upward force of 28.7 N on the ball as long as it is in the tube. With what velocity does the ball leave...

0.5Kg snowball moving at 20m/s strikes and sticks to a 70Kg man standing on the frictionless surface of a frozen pond. what is the final velocity?

Homework Statement A yo-yo has mass of 400 kg and radius of 1.5m. Its axle of rotation has a radius of 0.1m. Its string is attached to a crane. What is its final velocity after it is released. mass (m)=400 kg Radius (R)= 1.5 m axle of yo-yo (r)= 0.1 m...

How can I calculate the impact speed(final velocity) of an object of mass 100kg, dropped from a height of 100m, only considering gravity.

Homework Statement The graph shows the net external force component F cos θ along the displacement as a function of the magnitude of the displacement s. The graph applies to a 65 kg ice skater. http://img9.imageshack.us/img9/3441/0671.gif (a) How much work does the net force component do on...

Homework Statement Consider 2 magnetic masses, m1 and m2; these 2 repel each other for a distance s with force f (relative to each other)...which applies from m1 to m2. Predict final velocity of m1 and m2. Assume final distance to be v1 and v2 Assume the force that f acts is constants, i.e...

I thought of the following academic problem while watching a baseball movie. I ballplayer wishes to throw the game-winning ball to a kid in the stands. He wants to minimize the final velocity of the ball. Not the horizontal component of the velocity, but the the total magnitude of the...

The problem states that a plane approaching a mountain peak at a speed of 50 m/s is located at a vertical distance of 100.0 m above the peak. I calculated the distance at which the plane should release the package so it lands on the peak (first question), but the second question ask what the...

Homework Statement Consider 2 magnetic masses, m1 and m2; these 2 repel each other for a distance s with force f (relative to each other)...which applies from m1 to m2. Predict final velocity of m1 and m2. Assume final distance to be v1 and v2 Assume the 2 masses at rest initially...

Homework Statement A 70kg mass is in a space and moving at 2.5 m/s. You push it with 200N for 4 m. You then move to the front of the mass and push it backwards with 170N for 3 m. What was the total work done? What was the final velocity? Homework Equations W = rest energy + F1*r -...

Homework Statement A NASA satellite has just observed an asteroid that is on a collision course with the Earth. The asteroid has an estimated mass, based on its size, of 5 × 10^9 kg. It is approaching the Earth on a head-on course with a velocity of 611 m/s relative to the Earth and is now 5.0...

[solved] finding final velocity in a perfectly elastic collision ~~~Two marbles with equal masses collide. Marble A has an initial velocity of 1.69 m/s while marble B is initially at rest. If marble A comes to rest as a result of the initial collision, what is the final velocity of marble B...

Homework Statement "A truck weighs four times as much as a car, If the truck coasts into the car at 12 km/h and they stick together, what is their final velocity." Homework Equations Change in momentum a = change in momentum b OR m1v1 = m2v2 OR (delta)P system = 0 The Attempt at...

Homework Statement http://www.angelfire.com/punk/slayer_coool/arrow.jpg The information is there. Its vertical sorry. But I need to know the final velocity.

Homework Statement Evil Alien has put an Asteroid with mass of 1,000,000kg to destroy mankind. Distance from center of the Earth to Asteroid (assume negligible center) is 10^8m and let's the gravitational force do the work. Earth radius is 6.4 x 10^6m and its mass is 5.98 x 10^24kg...

Homework Statement particle 1 with mass 6.7 kg going 7.3 m/s collides inelastically with a particle of mass 4 kg at rest. find the final velocity of particle one after the collision. Homework Equations Ki = Kf but, mechanical energy is not conserved in an inelastic collision. pi = pf...

Homework Statement A ball of mass 20.0kg (mass A) traveling at a initial speed of 5.0m/s, collides with a ball of mass 10.0kg (mass B) which was traveling at a initial speed of 1.0m/s. What is the final velocity of mass A, what is the final velocity of mass B? mA = 2mB Homework...

Homework Statement A 1.00×104 railroad car is rolling at 4.00 when a 2000 load of gravel is suddenly dropped in. What is the car's speed just after the gravel is loaded? Homework Equations f=ma pi=pf The Attempt at a Solution I am very confused with this problem, but this is...

A 0.25 kg ball is attached to a 26-cm piece of string. The ball is first raised so that the string is taut and horizontal, then the ball is released so that, at the bottom of its swing, it undergoes an elastic headon collision with a 0.21 -kg ball that is free to roll along a horizontal table...