What is Initial velocity: Definition and 458 Discussions

In electronics, biasing is the setting of initial operating conditions (current and voltage) of an active device in an amplifier. Many electronic devices, such as diodes, transistors and vacuum tubes, whose function is processing time-varying (AC) signals, also require a steady (DC) current or voltage at their terminals to operate correctly. This current or voltage is a bias. The AC signal applied to them is superpositioned on this DC bias current or voltage.
The operating point of a device, also known as bias point, quiescent point, or Q-point, is the DC voltage or current at a specified terminal of an active device (a transistor or vacuum tube) with no input signal applied. A bias circuit is a portion of the device's circuit which supplies this steady current or voltage.

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  1. B

    Initial Velocity of Dog Jumping 0.20 m: 0 m/s

    Homework Statement A dog can jump to a height of 0.20 m. What is the initial velocity of the dog? Homework Equations v=v0+at The Attempt at a Solution I'm not sure if this is suppose to be a trick question. Are they talking about the gravitational acceleration? v=v0+at v0= 0...
  2. S

    Find Initial Velocity (With Wind Factored In)

    [Please Help!] Find Initial Velocity (With Wind Factored In) I can't do it =\. Q: What equation would I use to find initial velocity? Given: Wind Speed, Wind Angle, Coordinates of Origin, Coordinates of End Point, (Distance), Projectile Mass, Theta (Angle to Use) Here's my repost from a...
  3. W

    The object at rest has an initial velocity >0?

    Homework Statement A grasshoopper jumps 1.00 m from rest, with an initial velocity at a 45.0 degree angle with respect to the horizontal. Find the initial speed of the grasshopper (answer is 3.13 m/s) The maximum height reached (answer is .250m) Homework Equations...
  4. U

    Initial Velocity of 1.52 m High Jump Record

    Homework Statement Assuming the best high jump record from a standing position in a school was 1.52 m, what initial velocity was needed for this jump? neglect any sideways motion. Homework Equations velocity equation The Attempt at a Solution I don't really understand how to do...
  5. N

    Determining initial velocity and instant velocity

    Homework Statement The acceleration of a particle is given by ax(t) = 2.90t - 2.06 Q. Find the initial velocity v0x such that the particle will have the same x-coordinate at time t = 4.06 as it had at t = 0. Homework Equations vx = v0x + \intaxdt evaluated from 0 to t. x = x0 +...
  6. science_rules

    Finding the initial velocity of a projectile, given time, an angle, and distance

    Homework Statement A baseball is thrown at 20 degrees to the horizontal. The ball travels a horizontal distance of 18 meters when it returns to the same level as the instant it had been thrown. The total time it traveled between these points is 2.1 seconds. Determine the initial velocity (Vo)...
  7. T

    Find Initial Velocity of Cannonball Fired from Cannon

    Homework Statement A cannon shoots straight up into the air a cannonball which reaches a maximum height of 600m. What was the initial velocity of the cannonball when it was fired from the cannon. (Note: this problem contains all the information necessary to be solved.) use g=10m/s^2...
  8. B

    Conservation of momentum with initial velocity of 0

    I'm having a bit of trouble understanding the concepts of momentum conservation. Let's say I'm standing on a frictionless surface and I throw a 3kg brick horizontally with a velocity of 4m/s. In this scenario I can see that I'm going to be repelled backwards at a velocity of 12/my mass in kg but...
  9. D

    Initial Velocity in Vector3 format - non equal height

    I have been toiling over this for the last three weeks. I am programming a tank to fire at a target. The target can be all over the landscape up, down left right. Currently I have the turret turn to face the target turning the problem into a 2d equation. So I need help finding the right equation...
  10. L

    Determine the balls initial velocity

    Homework Statement Question Reads: " A passenger in a hot air balloon throws a ball with an innitial unknown velocity. the ball accelerates at 9.8m/s down for 2.0s. at which time its instantenous velocity is 24m/s [45 below the horizontal]. determine the balls innital velocity "...
  11. N

    A bullet goes through a ballistic pendulum, what is it's initial velocity?

    Homework Statement A 7.0-g bullet is fired into a 1.5-kg ballistic pendulum. The bullet emerges from the block with a speed of 200 m/s, and the block rises to a maximum height of 12 cm. Find the initial speed of the bullet. Homework Equations Conservation of Momentum The Attempt at...
  12. M

    Calculating Rocket's Initial Velocity with 45-Degree Angle

    Homework Statement a rocket is fired at an angle of 45degrees from the horizontal, if it travels 22m(horizontally) for a total time of 1.9 secs, what is its intitial veritical and horizontal velocity? Homework Equations i tried using s=ut+.5at^2 The Attempt at a Solution i came up...
  13. E

    Kinetic energy and initial velocity should be simple, right?

  14. M

    Initial Velocity Given Distance, Angle, and Initial Height

    Homework Statement Given your assigned projectile launcher determine the muzzle velocity. angle of launcher = 45degrees distance to bottom of barrel = 25.6 cm distance traveled when fired = 119.2cm Ignore Air resistance Homework Equations I don't know where to start since I have...
  15. G

    Finding Initial Velocity from Launcher Trajectory

    Homework Statement Find out the launch velocity from the launcher (the absolute starting point aka x=0) Angle (degrees) Height(cm) Average Distance Traveld(cm) 0 99.0 220.73 30 104.3 307.8 45 106.6 380.4 60 108.5 319.2...
  16. A

    Finding Cable Tension in Elevator w/ Initial Velocity

    Homework Statement An elevator with a small initial upward velocity being raised by a cable. The tension in the cable is constant. Find the magnitude of the tension in the cable. Be certain that the method you are using will be accurate to two significant figures. Acceleration=10 m/s^2...
  17. V

    3 balls are launched off a tall cliff with the same initial velocity

    which will strike the ball at the fastest speed? -one launched upward at a certain angel -one launched downward -one launched perfectly horizontally I am guessing 1, since it has the additional height to fall under gravity influence
  18. C

    What is the time it takes for a player to come to a stop from sliding?

    Homework Statement A person slides to third base. The coefficient of kinetic friction between player and the ground is 0.70. His velocity at the start of the slide is 8.23m/s [forward]. Prove that the time it takes the player to come to a stop from sliding is: time = initial velocity divided...
  19. M

    Projectile motion- initial velocity and launch angle

    Homework Statement Basketball player throws the ball form the middle of the court one second before the game ends. How much must the initial velocity of the ball be and at what angle it must be thrown, if it should hit the basket at the exact time of siren without preceding reflection from...
  20. H

    What is the initial velocity of the projectile given the displacement and angle?

    Homework Statement i have a problem from an in class lab where i have to find the initial velocity of the ball. given is the horizontal and vertical displacement of the projectile. Dy(height)=100cm Dx(range)=200m 0(theta)= 15degrees. Find the initial velocity.Homework Equations not sure what...
  21. D

    Projectile Motion without Initial velocity

    Homework Statement A stone is fired from a slingshot at an angle of 65° from the horizontal. The stone strikes the ground 8.0s later at an altitude 30m lower than the height at which it was released. At what initial velocity was the stone released? Homework Equations dy = viyt + 1/2gt2...
  22. L

    Potential energy of an object with initial velocity.

    Homework Statement A .300-kg ball is thrown vertically upward with an initial speed of 10.0 m/s. If the initial potential energy is taken as zero, find the ball's kinetic, potential, and mechanical energy at it's initial position. Homework Equations 1/2mv(f)^2 + mgy(f) = 1/2 mv(i)^2 +...
  23. J

    Find initial Velocity with only distance, angle, and acceleration.

    Homework Statement A cannon sends a projectile towards a target a distance 1580 m away. The initial velocity makes an angle 24◦ with the horizontal. The target is hit. The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the initial veloc- ity? Answer in units of m/s...
  24. C

    Distance with Initial Velocity other then 0

    Homework Statement A car is traveling at a straight line with an initial velocity of 14 m/s accelerates at a rate of 2.0 m/s^2 to a velocity of 24 m/s. What is the distance covered by the car in this process? Homework Equations d=Vot + 1/2at^2 The Attempt at a Solution Now I'm...
  25. C

    Kinematics: Throwing ball up the building with unknown initial velocity

    Homework Statement At the top of the building that's 65m high, a guy throws a ball upward. The ball comes back down and hits the ground in 4 seconds. A)What is the initial velocity when the guy threw the ball? B)What is the highest height of the ball? C)At what time does the ball comes...
  26. T

    Solving for initial velocity in an inelastic equation

    Homework Statement A 920 kg sports car collides into the rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.6 m before stopping. The police officer, knowing that the coefficient of kinetic friction between tires and road is...
  27. M

    Finding the initial velocity

    An arrow with a mass of 90g is fired from a bow whose string exerts an average force of 125 N on the arrow over a distance of 74 cm. so: m=90g=.090kg, F=125N, d=74cm=.74m Then find the initial velocity of the arrow as it leaves the bow. i can't seem to find the equation that would fit...
  28. R

    Find minimum initial velocity of object

    Homework Statement Find the minimum initial velocity needed for a ball starting from the middle-top (highest point) of a semicircular mound with radius R to go over without touching the mound if the initial velocity has only a horizontal component. Homework Equations v=d/t The Attempt...
  29. B

    Finding the initial velocity of a projectile so that it hits a moving object

    Homework Statement Object is 92m away from the projectile's launch position and is moving towards the launch position at 6m/s. The projectile is launched at an angle of 72 degrees towards the moving object. What must the projectile's velocity be if it is to hit the object moving towards...
  30. A

    Ski Jumper's Initial Velocity - Solve the Problem

    Homework Statement After :Leaving the end of a ski ramp, a ski jumper lands downhill at a point that is displaced 51.0 m horixontally from the end of the ramp. His velocity, just before lenading, is 23.0m/s and points in a direction 43.0 degress below the horizontal. Neglecting air resistance...
  31. S

    Initial velocity of a Ball thrown up

    Can someone one show me a step by step example of how to work out a problem where a ball is thrown up and it is a catched after let's say 10.5s, so how would I find out the initial velocity?
  32. S

    Projectile Motion - Initial Velocity with Wind

    Hey Physics Forums. This is my first post here, and I'm just wondering about how to find what the initial velocity SHOULD be based on all the other information that I provide (it's for a program application I coded). Anyways, I have this right now (which is for no wind/0 wind): I am just...
  33. A

    Projectile Motion - Initial velocity

    1. The problem statement A child runs down a hill with an angle of 20 degrees and then jumps up at a 20 degree angle above the horizontal. He lands 2.2m down the hill as measured along the hill. What is the child's initial velocity? The Attempt at a Solution Okay, I'm not even sure if I...
  34. J

    Finding Initial Velocity w/o Time to clear a specific height

    Homework Statement A basketball player shoots the ball at a height of 1.7m at an angle of 60 degrees into a hoop. The range is 10ft or 3.05m. The height from the ground to the top of the hoop is 10ft or 3.05m. What is the initial velocity m/s to make it to the hoop? Homework Equations...
  35. X

    Initial velocity when deacelerating at a constant rate

    Homework Statement You are driving along a straight section of roadway (x-axis). You spot a police officer and apply the brakes, slowing down at a constant rate. Your positions (in meters) at successive time intervals of 0.435 s are tabulated below as function of time. (1) Calculate the...
  36. M

    Find Initial Velocity given angle, distance, height launched from.

    1. A nerf gun in a vacuum is fired from .98 meters at an angle of 15degrees, going 7.86m. Find the initial velocity of the gun, then find the horizontal and vertical components of the initial velocity. Knowns g=-9.8m/s2 yo=.98m xo=0m y=o ( the final height of the dart is 0) x=7.86m θ=11...
  37. E

    Educate me please, I have to find initial velocity

    I'm doing a physics lab write-up. It was a projectile lab launching the projectile horizontally. The projectile was launched at a higher elevation (the table) down to the ground. Homework Statement Calculate how fast the projectile came out of the launcher. Use the data obtained. Well, my...
  38. D

    Initial Velocity (Without time and acceleration)

    Homework Statement You are standing at the top of a cliff that has a stair step configuration. There is a vertical drop of 7 m at your feet, then a horizontal shelf of 9 m, then another drop of 3 m to the bottom of the canyon, which has a horizontal floor. You kick a 0.26 kg rock, giving it an...
  39. C

    Initial Velocity without acceleration given.

    Homework Statement An antelope moving with constant acceleration covers the distance 74.0m between two points in time 7.70s . Its speed as it passes the second point is 14.6 m/s. Homework Equations What is its speed at the first point? What is the acceleration? The Attempt at a...
  40. F

    Initial Velocity of a projectile, how?

    Initial Velocity of a projectile, how? If I have a problem that says the x and y distance of a target from a starting position, and only gives the angle at which the particle is launched, how do I find the required initial Velocity for its launch? I've been given the following equations...
  41. M

    Finding Initial Velocity in Projectile Motion Problem

    I need someone to help me find the answer to this difficult homework problem: A seagull is diving towards a stone beach at an angle of 60 degrees to the vertical releases a clam from a height of 100 meters. The clam hits the beach 3.02 seconds later. To the nearest tenth of a m/s what was its...
  42. J

    Find initial velocity given angle and distance to go over an object

    Homework Statement A baseball leaving the bat at 46 degrees at a height of 1.2m from the ground clears a 3m high wall 125 meters from home plate. what is the initial velocity of the ball? that's my problems i am have a reasonable amount of trouble with it. any help would be much appreciated.
  43. X

    Initial velocity be larger or smaller once its calculated?

    If the pendulum is too long and the ball hits the top of the catcher really hard before imbedding itself in the catcher, will intial veloctiy be larger or smaller once its calculated?
  44. T

    Projectile Motion w/ unknown initial velocity & uneven launch/landing points

    Homework Statement A baseball thrown at an angle of 60.0 above the horizontal strikes a building 18.0m away at a point 6.00m above the point from which it is thrown. Ignore air resistance. A) Find the magnitude of the initial velocity of the baseball (the velocity with which the baseball is...
  45. F

    Find Acceleration with only Initial Velocity and Final position?

    Homework Statement A hockey puck sliding on a frozen lake comes to rest after 238 m. If its initial velocity is 3.8 m/s what is its acceleration if it is assumed constant? Answer in units of m/s^2 How long is it in motion? What is its speed after traveling 180 m? Homework Equations x=xo +...
  46. P

    Initial Velocity of a Rocket

    Homework Statement I need to find the initial velocity of a rocket using the method a=\Deltav/\Deltat. Given a situation where \Deltat = 4 seconds. The force of gravity in this case is -10(m/s) Homework Equations After I get \Deltav how do I turn that into the initial velocity? The...
  47. D

    What is the Launch Speed of Debris Ejected from Io's Volcanoes?

    Jupiter's moon Io has active volcanoes (in fact, it is the most volcanically active body in the solar system) that eject material as high as 500km (or even higher) above the surface. Io has a mass of 8.94×10^22 [kg] and a radius of 1815km . Ignore any variation in gravity over the 500km range of...
  48. R

    Finding initial velocity and time Please

    Finding initial velocity and time! Please please help! 1. A missile is aimed to hit a target 650 km away. If the missile is fired at an angle of 20 degrees with the horizontal, what should be its launch speed so that it will hit the target? Once fired, how long does the missile take to hit the...
  49. M

    What is the formula for finding initial velocity from acceleration and distance?

    Homework Statement A car accelerates at 1.65 m/s2 along a straight road. It passes two marks that are 30 m apart at times 2.4 s and 4.8 s. What was the car's initial velocity? Homework Equations Need help starting this problem? The Attempt at a Solution
  50. P

    Conservation of Momentum initial velocity curved path

    Homework Statement The frictionless track is made of a straight horizontal section and a quarter-circle with radius R = 5 m. A 1 Kg lump of putty is thrown toward the stationary 4 Kg block, and the block starts to slide with the putty stuck on it after the collision. If the normal force acting...
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