How do we measure velocity?
93067
In simple terms, velocity is the measure of displacment compared to time.  Not distance!  Distance is how far an object has moved period.  Displacment is how far an object has traveled from it's initial position.  Therefore, the derivative of the position function (with respect to time "dt")  is the function of velocity! dx/dt
528388
You can go about this problem a few ways. A force exherted on an object will give it a certain velocity. If F=m*a, and you have the force along with the mass, you can determine the acceleration. The acceleration, of course, is the change in velocity/change in time. You'll get a velocity change per second. If you know the ball is in contact for 0.03 seconds, you can determine the final velocity, v. \n\nKinetic energy is just 1/2 * m * v^2 so that will be a simple calculation once you figure out v.
501076
In physics,\n\nEnergy is always measured in Joules.\n\nMass is always measured in Kilograms.\n\nSpeed or Velocity is always measured in Meters per Second.\n\nthose are the SI units.
1005598
I believe it's a.\n\nHere is what i found:  \nDoppler radar uses the Doppler effect to measure the relative velocity information from a radar system. The Doppler effect shifts the frequency of the radar reflection based on the relative velocity (speed) of the "target", allowing for the direct and highly accurate measurement of speed.
587571
Two approaches that I can think of from a non-physicist.\n\n1. Simply a marker over how far back it physically recoils; or\n2. A spring scale fixed to a point that measures the peak force pulling back against it (you could also use a G meter if available).\n\nGood luck
448815
Do you mean a motion in parliamentary procedure?\nDo you mean motion as in physics?\nIn physics it is velocity relative to a plane of reference.\nYou measure it by determining the position of the item at two different times and then dividing by the difference in time.  So you get units of distance per time - velocity.\nLike miles per hour or feet per second or meters per second.
791525
questions are very easy. You must try them by yourself. I will only give hints-\n1> Instantaneous accl  = dv/dt\nAvg accl = (v2-v1)/(t2-t1)\n\n2> draw the vectors, take the components separately along x and y axes.\nremember accl component along x axis increases velocity along x axis, and accl component along y axis increases velocity along y axis.\n3> use the basic kinematics equations like v^2=u^2+2as etc
426540
A ball is made up of a large number of particles, say 10^24.\nWhen one measures the speed and position of the ball, one measures the *average* speed and *average* position of all these particles. This is not in contradiction with Heisenberg's uncertainty principle which states only that it is impossible to measure velocity and position of the same, given particle.
13383
Tachymeters measure speed. You time how long it took you to run a certain distance or do some given task and that is how fast you did it.
728981
Try this:\nHigh velocity causes increase in mass and high expenditure of energy.
1000570
Here's one: Measure the density of air.\n\nTake a flask, weigh it.\nVacuum out all the air, then weight it again.
392981
Is the speed at which it travels.
789266
Of course, it really depends on what lengths, masses and time increments you are trying to measure and why.  The key is to have a foundation reference point with each measurement.  But here are some ideas:\n\nLength:  A piece of string or a piece of paper is good tool.  If you need to know exactly how many feet something is, a common record album is 12 inches across ( 1 foot) or a standard floor tile which is 12 inches from one flat side to its' opposite.  Use this as your foundation length of your string.  For long distance you can guage the length of your footstep using the above method, then count your footsteps when walking constistently, or use the odometer in your car.  Not a precise technique but approximate.\n\nMass:  A bucket filled to the top with water, placed inside another bucket that can catch spilled water.  Let's say you want to find the mass of a bowling ball.  Simply place the bowling ball into the bucket filled to the top with water, and whatever water it displaces (and is caught in the second bucket), is its mass (example: 1 gallon).  Repeat these steps to find out the mass of other things like your dog.  It's not an exact science but it's a basis for comparison at home as long as you keep using the same buckets.\n\nTime:   The sun is always good for this since our clocks are based on exposure to it due to rotation of the Earth every 24 hours, and our revolution around it once a year.  It's how sundials work.  You use a shadow.  You can mark the position of a shadow with a pen or a scratch, then observe (and mark) how the shadow has changed at a later moment.  When sunlight is not available, candles are good to observe the passage of time in a similar way as they burn and melt, as long as you keep using the same kinds of candles.
24383
here are some simple mechanics formulas dealing with velocity:\n\nv=d/t\na=v/t\nvf^2=vi^2+2ad\nd=vit + 1/2at^2\n\nwhere v is velocity, vi is initial velocity, vf is final velocity, a is acceleration, and t is time.  also the i and the f after the v are just subscripts, and ^2 just means sqared.
708999
Find the inertia.  Find the change in inertia.  Use conservation of momentum to  find the new speed. etc,.
581110
You have to decide the velocity. You need to keep Re<2000. You know the diameter of the pipe, u need to know the coefficient of viscocity. Velocity range is to be calculated by putting all these quantities in the equation for Re, keeping Re between 0 and 2000. Then the velocity is to be controlled in that range.
11447
Velocity is a vector - this means that it has a direction. Speed is a scalar, i.e. just a number.\n\nTo illustrate, let's say I'm travelling in a spaceship to the moon. My speed is 50,000 mph. My velocity is 50,000 mph towards the moon.\n\nIf there is no direction given, it's not a velocity.