Final velocity Definition and 247 Threads

A gear train is a mechanical system formed by mounting gears on a frame so the teeth of the gears engage.
Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next. Features of gears and gear trains include:

The ratio of the pitch circles of mating gears defines the speed ratio and the mechanical advantage of the gear set.
A planetary gear train provides high gear reduction in a compact package.
It is possible to design gear teeth for gears that are non-circular, yet still transmit torque smoothly.
The speed ratios of chain and belt drives are computed in the same way as gear ratios. See bicycle gearing.
The transmission of rotation between contacting toothed wheels can be traced back to the Antikythera mechanism of Greece and the south-pointing chariot of China. Illustrations by the Renaissance scientist Georgius Agricola show gear trains with cylindrical teeth. The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio.

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  1. T

    Finding final velocity with variable acceleration due to air resistance

    Homework Statement Hello! This is my first time posting here but I have been viewing these forums for help in my physics class for a while. Lately I have been stuck on one single problem that I haven’t been able to find any help with anywhere online. Any who, here is the problem: a cat...
  2. A

    Final velocity of this hockey puck

    Homework Statement In the last second of a hockey game, a player slaps the puck in the empty net 32.5 m away. The puck leaves the stick with the speed of 41.5 m/s. Calculate the final velocity of the puck if its mass is 0.17 kg.Homework Equations μK = 0.005 μK = FK / FN F = ma v22 = v12 +...
  3. P

    Help with final velocity of a rocket

    Homework Statement Calculate the final velocity of a rocket if the velocity of the ejected gas is c, initial mass of rocket is M0 and final mass is Mr, v0=0. Homework Equations We have to calculate the final velocity of rocket. The Attempt at a Solution Because the total momentum...
  4. S

    2d Kinematics Problem Final Velocity

    Homework Statement http://imgur.com/fGYf0 Stuck on #3 Homework Equations V = Vi + a*t Y = (1/2)gt^2 + (ViY * t) + Yi The Attempt at a Solution I have found the vertical and horizontal components and the initial velocity. ViX = 6.2 ViY = 9.922 Vi = 11.7 Yf = 0 Yi = 7 Xi =...
  5. T

    Final Velocity given only Initial Velocity and Angle

    Homework Statement This is a homework that has me completely stumped. If anyone help me out here, I would greatly appreicate it. A billard ball is east at 2.0 m/s. A second, idential ball is shot west at 1.0 m/s. The balls have a glancing collision (not head-on), deflecting the second ball...
  6. D

    How do i find the final velocity with 2 height variables and gravity

    1.A tennis ball is dropped from 1.3 m above the ground. It rebounds to a height of 0.956 m. With what velocity does it hit the ground? The acceleration of gravity is 9.8 m/s^2 (Let down be negative.) Answer in units of m/s 2.With what velocity does it leave the ground? Answer in units of m/s...
  7. J

    How to get initial and final velocity? thanks

    Homework Statement a human cannonball in 1940 soared over three ferris wheels, each 18 meters high covering a horizontal distance of 10.63 meters. Assuming that the point of projection is 2.50 meters above the ground and that he landed safely on a net placed at the same level, find his initial...
  8. S

    Electric Fields , Finding final velocity. NEED HELP

    Homework Statement Mass= 15g Q1= 8.0uC Q2= 25 uC (stationary) Q1 is released from a point 12cm from Q2. How fast will Q1 be moving when the separation is 20cm. Homework Equations F=ma F=qe F=kQq/r2 E=kQ/r2 Ke=mv2/2 W=FD vf2=vi2+2ad The Attempt at a Solution...
  9. M

    What Is the Velocity After 1 Meter?

    If an object starts with an initial velocity of 0, and has a velocity of 1.07 m/s after 20 cm, what is the velocity at 1 meter, assuming a constant acceleration? I do not know how long it takes to travel the full 1 meter. All I know is that after 20 cm the velocity was 1.07 m/s and it took 177...
  10. S

    Equation for Final velocity: Projectile Fired from Earth

    Suppose a projectile is fired upward from the surface of the Earth. If the initial speed of the projectile is v = 12.0 km/s (more than the escape velocity): how fast will it be moving it is so far from Earth that the force of gravity is approximately zero? The equation I was given to solve...
  11. A

    Solving the Rock's Final Velocity Off a 33m Cliff

    Homework Statement A boy throws a rock off of a cliff that is 33m high. The rock weights 1 kilogram and it's inital velocity is 13.5m/s. It is thrown at an angle of 40° with the horizon. Initial Velocity = 13.5m/s mass = 1 kg θ=40° Δy = 33m g = 9.81 m/s^2 Homework Equations...
  12. C

    Calculating Final Velocity of a Bowling Ball

    Homework Statement A spherical bowling ball with mass m = 3.2 kg and radius R = 0.112 m is thrown down the lane with an initial speed of v = 8.1 m/s. The coefficient of kinetic friction between the sliding ball and the ground is μ = 0.32. Once the ball begins to roll without slipping it...
  13. S

    Find final velocity and kinetic energy lost.

    Homework Statement Mass m1=6kg traveling with velocity 4 m/s collides with mass m2=16kg traveling with velocity 3m/s in the direction shown (m2= is at an angle of 60degress). If the two masses stick together, find the final velocity of the combined masses, and the kinetic energy lost...
  14. T

    Calculating pressure on a surface after reaching final velocity

    I have a question. I'm conducting a drop test for packaging material and I need to find the pressure at the point of impact. What I did was drop a 18 lb ball 18". I converted the mass to 3.629g and the distance to 0.4572m to work in S.I. units then used the equation 2ad=Vf^2-V0^2. Afetr...
  15. M

    Calculating Final Velocity of a Truck Under Braking

    Homework Statement a small truck of mass 2.00*10^3 kg traveling at 72.0km/h experiences a force of 1.00*10^4 N for 0.800 s, when the brakes are applied. What is the final velocity? Homework Equations The Attempt at a Solution
  16. J

    Final velocity of a rock and how it compares to work

    Homework Statement I have been given this example with the following questions: 1. Two rocks are thrown off of a cliff with the same initial speed, v. The first rock is launched with at an angle Ө directed below the horizontal as shown below as 1, while the second rock is launched above at the...
  17. S

    Final velocity of a proton through parallel plates

    Homework Statement A moving proton has 6.4x10^-16 J of kinetic energy. The proton is accelerated by a potential difference of 5000 V between parallel plates. http://members.shaw.ca/barry-barclay/Self-Tests/test09/elecst17.gif The proton emerges from the parallel plates with what...
  18. M

    Using the Elastic equation to find the final velocity

    Homework Statement A ball of mass 0.440 kg moving east (+x direction) with a speed of 3.30 m/s collides head on with a .220 kg ball at rest. If the collision is perfectly elastic what will be the speed and direction of each ball after the collision? Homework Equations...
  19. AcousticBruce

    Throwing ball in air and final velocity.

    Homework Statement You throw a ball straight up @ 22m/s and you catch it 3.6 seconds later. How fast was it going when you caught it? Homework Equations v_f=v_i+at The Attempt at a Solution I found the right solution. But to me, it seems it should be more complex then this...
  20. W

    Final velocity, three forces, time, mass and velocity given

    Homework Statement A small robotic spacecraft (m= 145kg) is initially moving in the +x-direction at .150 m/s. Then, its x-axis thruster exerts the following force on the spacecraft : Fx(t) = -5.00 N during 0s<t<1.5s -9.00 N during 1.5s< t< 3.25s -6.00 N during...
  21. B

    Average velocity vs Final velocity

    Homework Statement Shouldn't average velocity multiplied by 2 be equal to final velocity. We were doing a lab and we calculated an average time of .54 seconds to travel 1.92 meters. Multiplying the average velocity by 2 gives an extremely different answer than vf=gt. I know there is...
  22. T

    Calculating final velocity of an object on an inclined plane

    Hello everyone, I'm stuck on a dynamics review question. I was told to solve like I would with other inclined planes, however mass was not given. I am not sure how to proceed. Homework Statement A roller coaster reaches the top of the steepest hill with a speed of 1.4 m/s. It then descends...
  23. D

    Am I taking the right approach? (Finding final velocity)

    I've been given this problem http://i.imgur.com/7XtYt.png and I had no idea of how to come up with an answer since it is a circular path. The only thing that occurred to me is find the initial height using the chord length formula for a circle and then treat that chord as the hypotenuse of a...
  24. E

    Final velocity and frictional force?

    Homework Statement a) A jet fighter has two engines each generating 70,000 N of thrust. What is the acceleration of the 15,000 kg jet? b) The above jet reaches a final velocity of 240 m/s. What is the frictional force on the jet? Homework Equations Ff= Fn(mew?) F=MA ? The...
  25. M

    Final Velocity of Hockey Puck: 40.0 m/s to ?

    Final Velocity... Problem: A hockey puck is given an initial velocity of 40.0 m/s along the ice. Find the speed of the puck 1.00 s later if the coefficient of kinetic friction (U) between puck and ice is 0.600. (HINT: The result is independent of the mass of the puck.) My solution...
  26. D

    Finding initial velocity given displacement, time, and final velocity

    Homework Statement A woman running at constant velocity speeds up and accelerates uniformly to the west by running 253 m west in 6.12 s. ff she ends up getting up to a velocity of 5.05 m/s w, how fast was she going originally? If she had run the same disance in 5.50 s, what would her average...
  27. B

    How Do You Calculate Final Velocity with Uniform Acceleration?

    1. Determine the acceleration of an object whose velocity is initially 24 cm/s and which accelerates uniformly through a distance of 66 cm in 3.8 seconds. 2. s = (vf + v0) / 2 * t, 3. I tried rearranging that formula but I got vf= 477.6. This just doesn't make any sense
  28. A

    How Do You Calculate Final Velocity with Constant Acceleration?

    Homework Statement a car is at a velocity of 20 km/h if the car traveled 120 km in 3 hours at constant accelration. what is the final velocity? Homework EquationsV^2=Vo^2+2ad The Attempt at a Solution I am completely confused. The book does not even list the particular formula above. And...
  29. D

    What is the final velocity of the particle?

    The image below "gives, as a function of time t, the force component x that acts on a 2.40 kg ice block that can move only along the x axis. At t = 0, the block is moving in the positive direction of the axis, with a speed of 2.5 m/s. What is its velocity, including sign, at t = 11 s...
  30. B

    Calculating Final and Change in Velocity for a Rolling Ball Experiment

    1. I am doing an experiment. I am rolling a ball down textbook that is propped up on one side. If the ball rolled 11 inches in 1.875 seconds. How can I get the final velocity and the change in velocity? 2. I know I can get the average velocity by dividing 11/1.875 and the initial velocity...
  31. A

    How to get final velocity in relativistic mechanics

    Hello guys, I am not sure whether this is actually a simple problem but I'm not really a physics student, just someone very passionate for it. So I'm trying to use Newton's second law in its relativistic version (force is equal to the rate of change in momentum) to find the velocity and...
  32. A

    Final velocity problem involving a roller coaster changing height

    A roller coaster (475kg) passes point C with a velocity of 10.0 ms-1, calculate the velocity of the roller coaster at point A. mass = 475 kg velocity at C = 10 ms-1 height at A = 30m height at B = 0m height at C = 25m height at D = 12m Ep = mgh Ek = 1/2mv^2 The trolley is moving...
  33. G

    Solving for the final velocity of an object thrown off of a Martian Volcano

    The tallest volcano in the solar system is the 19 km tall Martian volcano, Olympus Mons. An astronaut drops a ball off the rim of the crater and that the free fall acceleration of the ball remains constant throughout the ball’s 19 km fall at a value of 4 m/s2. (We assume that the crater is...
  34. X

    Gravitational potential, highest point, and final velocity

    A model rocket has a mass of 3.00kg. It is fired so that when it is 220 m above the ground it is traveling vertically at 165m/s. At the point its fuel runs out so that the rest of the flight is without power. Assume that the effect of air friction is negligible and that all potential energies...
  35. J

    Which object has the greatest final velocity?

    Every object has the same mass and shape etc. Object a is dropped from the side of the ramp straight down Object b slides down an angled ramp Object c slides down a ramp that is curved Facts No friction All objects sliding All initial velocities are equal All Intial positions are the...
  36. C

    What is the final velocity from given work, mass, initial velocity, and time?

    Homework Statement I am trying to find the final velocity from the given data Work - 3000J Mass - 1/2d (d = distance travelled) Initial Velocity - 7m/s Time - 7 seconds Homework Equations W=change in energy W=Fd The Attempt at a Solution W =work F=force m=mass a=acceleration d=distance traveled...
  37. H

    How Do I Calculate the Final Velocity of a Trolley?

    Hi, I've been given an assignment from college which has me totally baffled! (Ashamed to say this is my weakest subject ha) I have read the rules and I do not wish for my work simply done for me, just a explanation would be brilliant! Or a similar question would be great so I could...
  38. R

    Final velocity of 2 spheres attracted by gravity and electrostatic charge

    Homework Statement Two insulating spheres having radii 0.22 cm and 0.42 cm, masses 0.16 kg and 0.47 kg, and charges −4 μC and 5 μC are released from rest when their centers are separated by 1 m. How fast is the smaller sphere moving when they collide? Answer in units of m/s...
  39. P

    Initial vs. Final velocity of projectile with no net displacement

    if a ball is thrown and caught at the same height with constant horizontal velocity and no vertical displacement is its initial and final velocity the same? since v2y^2=v1y^2+2aDy, no displacement means final vertical velocity will be the same as initial, since v2x=v1x, horizontal velocity...
  40. E

    Using conservation of momentum to find final velocity in a collision

    Homework Statement Two cars, both of mass m, collide and stick together. Prior to the collision, one car had been traveling north at speed 2v, while the second was traveling at speed v at an angle \phisouth of east (as indicated in the figure). After the collision, the two-car system travels at...
  41. R

    Object thrown upward with known initial and final velocity

    Homework Statement A cliff diver runs horizontally at 4.00 m/s. He hits the water 3.00 s later. Ignore air resistance. (a) What is the diver's speed (magnitude of the velocity vector) just before he hits the water? Homework Equations Change in y-component: y(t) = vyot + (1/2)g(t^2) Change in...
  42. B

    Projective motion from a height, final velocity and horizontal distance

    Homework Statement A man stands on the roof of a 10.0 m -tall building and throws a rock with a velocity of magnitude 24.0 m/s at an angle of 30.0 degrees above the horizontal. You can ignore air resistance. Calculate the magnitude of the velocity of the rock just before it strikes the ground...
  43. O

    Final velocity given acceleration and initial velocity

    Homework Statement A dynamite blast at a quarry launches a chunk of rock straight upward, and 2.1 s later it is rising at a speed of 19 m/s. Assuming air resistance has no effect on the rock, calculate its speed at (a) at launch and (b) 5.2 s after the launch. Homework Equations v = v0 +...
  44. B

    Final velocity, incomplete equation (answear included)

    Homework Statement A space vehicle traveling at a velocity of 1200ms -1 separates by a controlled explosion into two sections of mass 865kg and 2010 kg. The two parts carry on in the same direction with the heavier rear section moving 120 ms -1 slower than the lighter front section...
  45. ∞

    What is the formula for final velocity that has time in it?

    Hi, I'm studying for my final exam in Physics tomorrow (doing a review packet) but I keep forgetting the equation/formula needed to find final velocity (not the one with the distance, but the one with time). I don't have most of my notes as my teacher keeps folders of our work and notes at...
  46. L

    How do you find final velocity with initial velocity and energy gained?

    Homework Statement It gives the mass, energy gained (change in energy), initial velocity and power and time I　need to find final velocity Homework Equations EK= 0.5mv^2 The Attempt at a Solution I was thinking of plug in the number into above formula but if i do this i won't be...
  47. O

    Finding the Final Velocity unsing a Force by Time Graph.

    Homework Statement The graph below shows the force applied to a 3.8 kg cart initially at rest but free to move on a horizontal track. Calculate the final velocity of the cart, after being subjected to the forces illustrated in the graph. The graph is attached. Homework Equations Okay so I...
  48. H

    Kinematics: Final velocity components

    Homework Statement A skier leaves the ramp of a ski jump with a velocity of 10.9 m/s, 13.9° above the horizontal. The slope is inclined at 48.4°, and air resistance is negligible. Calculate the velocity components just before the landing. Enter the x-component (horizontal) first and then the...
  49. O

    How Fast is a Comet at Pluto's Distance?

    A comet is in an elliptical orbit around the Sun. Its closest approach to the Sun is a distance of 4.7x10^10 m (inside the orbit of Mercury), at which point its speed is 9.6x10^4 m/s. Its farthest distance from the Sun is far beyond the orbit of Pluto. What is its speed when it is 6x10^12 m from...
  50. G

    Final velocity of spring down incline with fricition

    Homework Statement A spring with a spring-constant 2.5 N/cm is compressed 35 cm and released. The 4 kg mass skids down the frictional incline of height 37 cm and inclined at a 20◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a distance of 0.5 m along the...
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