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. S

    Initial velocity of an object

    Homework Statement What was the initial velocity of an object that moved 120m in 5.60s, reaching a final velocity of 15.0m/s in that time? Homework Equations v=d/t a=v2-v1/t2-t1 3. The Attempt at a Solution I was wondering is there an acceleration that I'm missing here? or am i...
  2. M

    Finding the initial velocity of a projectile motion

    Homework Statement A baseball is hit at an angle theta. After a time, it lands 7.5m above the point at which it was hit, the land angle is 28 degree below the horizon. The final velocity is 36m/s2. Find the direction and magnitude of the initial velocity. Know: vf = 36m/s2...
  3. I

    How to find initial velocity from range and angle.

    Homework Statement A golf ball is hit at an angle of 30 degrees, it travels 50m landing straight in the hole. Ignoring air friction, what is the initial velocity? Homework Equations not too sure, d=vi.t+1/2.a.ts∧2, vf=u∧2+2.a.d, v=u+a.t, d=u.t The Attempt at a Solution Vertical...
  4. J

    Finding Initial Velocity for Cannon Projectile to Hit Enemy Headquarters

    Homework Statement A projectile must be fired from a cannon and hit the enemy headquarters located on the top of a cliff 75.0 m above and 350 m from the cannon. The cannon will shoot the projectile at an angle 40.0 degrees above the horizontal. What does the speed of the projectile need to...
  5. V

    Work Done: Which Initial Velocity is Most Effective?

    Homework Statement 1) In which of the following situations is work done? A man rubs his hands together and they get warm or the moon orbits the earth? 2) A man pulls a 100 kg block across a frictionless floor using a rope. The rope makes an angle of 60 degrees with the horizontal and...
  6. J

    Solving for Initial Velocity Up a Plane: A Homework Problem

    Homework Statement A carton is given an initial speed of 3.0 m/s up a 22.0 degree plane. a.) How far up the plane will it go? b.) How much time elapses before it returns to its starting point? Ignore friction. Homework Equations F=ma The Attempt at a Solution I have no clue. If...
  7. C

    Projectile Motion: Finding Initial Velocity

    Hello, When trying to find initial velocity in Proyectile motion can I use the formula or Range: R=Vo^2 x sin angle / Gravity The question is if the velocity I get through that equation will be the vector in X, Y or the resultant one? Thanks
  8. J

    Asymmetric initial velocity calculation

    Homework Statement A rock is thrown upwards at an angle of 35.0° to the horizontal. The rock hits a signpost 15.0 m away at a point 2.00 m above the level from which it was thrown. Calculate the initial velocity of the rock. Homework Equations d = v * t d= displacement...
  9. T

    Integration and initial velocity

    Homework Statement With what initial velocity must an object be thrown upward (from ground level) to reach a maximum height of 550feet. Use a(t)= -32ft/sec2 as the acceleration due to gravity. (neglect air resistance) Homework Equations Use integration The Attempt at a Solution...
  10. P

    Finding the Initial Velocity for a 0.8m Volleyball Jump

    Homework Statement In order for a volleyball player to jump vertically upward a distance of 0.8 meters, his initial velocity must be?Homework Equations s=v0t + .5at2 vf= v0 + atThe Attempt at a Solution I missed the question the other day on a practice and it has been forever since I messed...
  11. G

    Terminal velocity with an initial velocity?

    How could I find how long (time) it takes to reach terminal velocity with an initial velocity? http://www.geocities.com/operation_rising_star/mis.tve.htm <- does this make sense? using 1/2pV^2*C*A=ma Thanks in advance.
  12. N

    How to find initial velocity in projectile motion problem?

    I'm in a physics 1 honors course at my high school and we have been working on projectile motion problems. I'm very confused on how to solve this problem though more because of the math than the physics I think. The problem asks for the initial velocity of a spear that was thrown at a 35...
  13. M

    Solving for distance using only initial velocity and coefficient of friction

    This problem is quite difficult for me. I know that there's a way to do this, but i can't figure it out. Could someone point me in the right direction? i don't need a solution, but a process would be nice. Homework Statement A box is given an initial push so that it slides across the floor...
  14. P

    Determining angle from initial velocity and distance

    Homework Statement A gun fires a round that goes 122 km in 170 seconds before impacting the ground. Ignore air resistance and the curvature of the earth. Find the muzzle velocity and angle. Homework Equations Vx = Vi(cos(theta)) Yx = Vi(sin(theta)) t= (-2Vy/-9.8) and...
  15. P

    Inelastic collision: finding initial velocity of projectile

    Homework Statement One way to measure the muzzle velocity of a bullet is to fire it horizontally inot a massive block of wood hanging from a string an d measure the height to which the wood (containing the bullet) rises. in one experiment the bullet had a mass of .05kg, and the wood has a...
  16. P

    Displacement from angle and initial velocity

    Homework Statement A ball is thrown horizontally from the top of a building at 45.6 m/s. We want to know how long it takes for the ball to drop below an angle of 13 degrees. Ignore air resistance. Homework Equations I'm assuming the projectile equation is necessary (delta)y = Vyit +...
  17. A

    Acceleration due to Gravity: calculate initial velocity

    1. Homework Statement A Pole vaulter leaves the ground to travel 4.0 m up and over the bar, and then another 4.0 m back to the ground. It takes 1.81 s for the whole trip. Caculate the velocity with which she left the ground. 2. Homework Equations Well the equation I used which I saw...
  18. P

    What are the Initial Velocities of Two Cars Colliding at Different Directions?

    Homework Statement two cars collide with each other and basically go different directions m1 starts out going West and m2 starts out going North I have set sign conventions to have North + and West - East + and south -...
  19. G

    Calculating Initial Velocity Needed to Reach Specified Height

    Homework Statement I have a projectile that shoots straight up into the air (parallel to the y-axis). I need to calculate the initial velocity needed to reach a specific height. I am given the following: - the y-displacement (s1) to reach - the time (t) at which the projectile reaches the...
  20. H

    Rocket Lab, Finding Initial Velocity, Height Given time.

    Homework Statement We are doing the Rocket lab in my Physics class, we shot rockets with different caps on them [ Low, Med, High ] and recorded the times. I have the time, i need to find Initial velocity and Height given that i have time. I also need to take into consideration air resistance [...
  21. F

    Projectile motion, finding initial velocity

    Homework Statement A rock is thrown from a 1 meter height with a 35 degrees angle with horizontal. At x=64 m, its height is y=29 m. Find it's initial velocity. Homework Equations x=x_{{0}}+v_{{{\it x0}}}t+ 0.5\,a_{{x}}{t}^{2} y=y_{{0}}+v_{{{\it y0}}}t+ 0.5\,a_{{y}}{t}^{2} The...
  22. F

    Picky about initial velocity condition

    In simple kinematic problems, the initial velocity can be zero or some nonzero value. A friend asked me: what makes it zero in some cases and nonzero in some others. Take a rocket in take off. It has acceleration moving upward, from the beginning, but its v_0=0. Instead, if I apply...
  23. V

    Conservation of Energy initial velocity

    I know if there was no initial velocity, the velocity at the bottom would just be sqrt(2gh), but I'm not sure how the initial velocity impacts the velocity at the bottom. I thought just adding the x-component of the velocity would be enough but apparently it's not :\
  24. Q

    Find direction of initial velocity of nonrelativistic particle in B

    I'm really trying to get my head around this one and our text doesn't give a very good example of this. Problem: A nonrelativistic particle of charge q and mass m is in a uniform magnetic field B in the z drection. The inital position is x=0, y=0, z=0; the magnitude of inital velocity of...
  25. S

    Solving Gravity: Initial Velocity & Time

    I guess this isn't the proper format, but I would rather try and work out the complete problem on my own :\ If this is a huge faux pas then someone can go ahead and delete this post i suppose. Now that that's out of the way, could someone tell me if it is possible to determine acceleration...
  26. M

    Solving Distance w/ Initial Velocity: Lab Homework

    Homework Statement We are doing a lab where the teacher took an chalkboard eraser and he put it between to rulers in a hallway. He used some sort of slingshot to project that eraser.( we did not see how far the eraser went) We have to find how far the eraser will travel in meters. All we were...
  27. R

    Projectile motion, with no Initial Velocity

    Homework Statement A 2.00-m tall basketball player is standing on the floor 10.0 m from the basket. If he shoots the ball at a 40 degree angle from the horizontal, at what initial speed must he throw the ball so that it goes through the basket without striking the backboard? The height of the...
  28. F

    Finding Initial Velocity in a Car's Motion Using Graph Analysis

    Hi guys, I'm having trouble finding a reasonable answer to the initial velocity of a car. These are my givens: t(s) 0 1.0 2.0 3.0 4.0 5.0 x(m)0 2.3 9.2 20.7 36.8 57.5 I have solved that the average velocity = 13.8m/s That the average acceleration =...
  29. T

    Projectile Motion (No initial velocity)

    Homework Statement A salmon starts 2.00 m from a waterfall that is 0.55 m tall and jumps at an angle of 32.0. What must be the salmon's minimum initial speed to reach the waterfall. Homework Equations \Deltay=visin\Theta\Deltat+1/2g\Deltat2 The Attempt at a Solution I have tried all...
  30. T

    Projectile Motion (No initial velocity)

    Homework Statement A salmon starts 2.00 m from a waterfall that is 0.55 m tall and jumps at an angle of 32.0. What must be the salmon's minimum initial speed to reach the waterfall. Homework Equations \Deltay=visin\Theta\Deltat+1/2g\Deltat2 The Attempt at a Solution I have tried all...
  31. S

    Finding initial velocity and theta, given range and height

    Homework Statement A stone is thrown down a slope. I am given the Range of the slope and the max height from spot thrown. R= 50m h= 12m Homework Equations I need to determine the magnitude of Vo and inital theta. The Attempt at a Solution First I need to find V_o: I feel that the only...
  32. C

    How to Find initial Velocity at 90 degrees with only a time variable given

    I am given the information that a nerf dart is launched upwards at a 90 degrees with the top of the launcher at 1.953ft and that it hits the ground .43 seconds later. I am then tasked with finding the initial velocity of the launcher and I have no idea where to start.
  33. WCOLtd

    Does Initial Velocity Effect Gravitational Accleration?

    Does it's initial velocity effect the acceleration a mass receives due to the gravitational field? If two bodies of equal mass were moving towards a massive body, and they started at the same radius from the surface but one went at 10 times the velocity of the other, when the bodies impact...
  34. M

    Trajectory for a runner aiming to a fixed point, with initial velocity?

    Hello, I want to know how long time a running runner needs to reach a point, when he is initially running in the wrong direction. I'd like to do this with minimal calculation, so an approximation at 10% would be enough. To even complicate the problem more, the runner can decelerate...
  35. P

    Inelastic Collision and Finding Initial Velocity

    Homework Statement Two rolling gold balls of the same mass collide. The velocity of one ball is initially 2.70 m/s [E]. After the collision, the velocities of the balls are 2.49 m/s [62.8 degrees N of W] and 2.37 m/s [69.2 degrees S of E]. What are the magnitude and direction of the unknown...
  36. P

    Inelastic Collision and Finding Initial Velocity

    Collisions and Determining the Original Speed Homework Statement Two spacecraft s from different nations have linked in space and are coasting with their engines off, heading directly toward Mars. The spacecraft s are thrust apart by the use of large springs. Spacecraft 1, of mass 1.9 x...
  37. C

    Simple equation to calculate my initial velocity

    I am looking for a simple equation to calculate my initial velocity when I jump in layman's terms. For instance...if I weigh 91kg and jump 1 meter...what is my initial velocity and what would my maximum jump height be if I weighed 81kg? This is probably something I missed in freshman...
  38. I

    Find initial velocity only need hint

    Homework Statement home run hit and baseball just clears the top of the bleachers. @= 35 degrees bleacher height = 21 meters distance from bleachers to home plate = 130 meters neglect air resistance find initial velocity and time of flight Homework Equations x comp: x= vcos@ t +...
  39. J

    How can you determine initial velocity without the given information?

    [SOLVED] Initial velocity not given Hello, I was looking for a strategy for finding the initial velocity for a problem that gives the angle and height. The problem is: A ball is dropped and rebounds with an intial velocity of what magnitude considering the ball must bounce through an...
  40. V

    Help determining initial velocity

    im working on a lab and i have to determine the initial velocity of gliders that we pushed down an airtrack. the only data that was recorded is the change in x and time. eg. change in x = .3 meters t= 1.1 seconds i've looked through all the equations i could think of to find the answer...
  41. P

    Solving for Initial Velocity: When Angles, Distances are Given

    Homework Statement how can you find the initial velocity if the angle, horizontal distance and the vertical distance is given?Homework Equations The Attempt at a Solution every equation i use gives me a different answer so i have no clue which one is correct
  42. J

    Calculating Initial Velocity of a Projectile

    is it possible to find the initial velocity of a projectile if you only know the Force applied (47N) to the projectile and the mass (0.04kg) of the projectile (assuming air resistance is negligible).. oh and the angle it was fired at was 30 degrees.. thanks in advance
  43. E

    Ballistics - calculating initial velocity

    Hello all, This is my first post so be gentle. :smile: I am programming a ballistics related script to a predefined physics engine. I am no physicist nor a mathematician so my knowledge in these things is quite limited. To the point: I need to calculate the initial velocity needed to...
  44. S

    Initial Velocity, Equal Mass Collision: Angle Calculation

    After a completely inelastic collision between two objects of equal mass, each hacing initial speed v, the two move off together with speed v/3. What was the angle between their initial directions?
  45. S

    Find Initial Velocity & Angle of Projection for a Projectile at 40m

    Homework Statement If at height of 40 m the direction of motion of a projectile makes an angle 45 degrees with the horizontal, then what is its initial velocity and angle of projection? Homework Equations The Attempt at a Solution
  46. S

    Initial velocity (and momentum)

    A 2020kg car moving at 20.0m/s collides and locks together with a 1400kg car at rest at a stop sign. Show that momentum is conserved in a reference frame moving at 10.0m/s in the direction of the moving car. initial momentum final momentum I don't understand why that the answer for...
  47. N

    Finding Initial Velocity: A Guide to Equations

    What equation do I use to find the initial velocity of an object?
  48. K

    How do I get a formula that finds the initial velocity with height in it?

    How do I get a formula that finds the initial velocity with height in it?? How do I get a formula that finds the initial velocity with height in it?? i was doing a inclined plane problem with is deal with 2 steel balls' collision~ could somebody help me to derivate that formula?
  49. C

    Solving Physics Project: Initial Velocity of Dart?

    thanks
  50. L

    Angle of initial velocity

    Homework Statement At half its maximum height, the speed of a projectile is three-fourth its initial speed. What is the angle of the initial velocity vector with respect to the horizontal Homework Equations any projectile equation The Attempt at a Solution ?
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