Relative speed Definition and 57 Threads

The relative velocity







v





B

A




{\displaystyle {\vec {v}}_{B\mid A}}
(also







v





B
A




{\displaystyle {\vec {v}}_{BA}}
or







v





B
rel

A




{\displaystyle {\vec {v}}_{B\operatorname {rel} A}}
) is the velocity of an object or observer B in the rest frame of another object or observer A.

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  1. W

    How to Show Lorentz's Identity with Relative Speed?

    Homework Statement start from: x = [x' + vt']/sqrt[1 - v^2/c^2] ct = [v/cx' +ct']/sqrt[1 - v^2/c^2] y = y' z = z' Homework Equations show that ( 1 - \frac{u^{2}}{c^{2}})(1+\frac{vux'^{2}}{c^{2}}) = ( 1 - \frac{v^{2}}{c^{2}})(1-\frac{u'^{2}}{c^{2}}) The Attempt at a Solution...
  2. M

    Relative Speed Calculation for Man Walking on a Moving Boat

    Homework Statement A ship cruises forward at Vs = 5 m/s relative to the Water. On deck, a man walks diagonally toward the bow such that his path forms an angle theta = 22 degrees with a line perpendicular to the boat's direction of motion. He walks at Vm = 2 m/s relative to the Boat. Here...
  3. M

    Relative speed of tachyons greater than c?

    I found some interesting task about tachyons: "Spaceship A sends to spaceship B ( distance between A and B is known) a tachyon, when B recives signal, it sends back it immediately. B flies away from A with velocity v, and the tachyon moves away with the relative velocity V from the...
  4. michael879

    Relative speed of a photon - mk2

    This thread was snipped and moved from the thread "conflict between electrodynamics and classical relativity" orignally posted by michael879.
  5. S

    What's the Speed of the Bird Flying at a 60-Degree Angle?

    Homework Statement speed of man=120m/h angle of bird flight with ground=60 degrees.Homework Equations A man on the ground sees a bird flying at angle of 60 degrees with horizontal.He started running at 120m/hour,is able to stay directly below the bird.What's bird speed? The Attempt at a...
  6. D

    Understanding the Constant Speed of Light: A Brief Explanation

    Hey. I've been reading about time dilation and the possibility of time travel, and I've come across a strange concept a few times. Light traveling towards me will be traveling at ~300000000m/s if i am standing still. Apaprently, even if i move towards the light, the speed of the light...
  7. P

    Relative speed: Horizontal distance travelled in a collision

    Given coefficient of kinetic friction is zero and the coefficient of restitution is e: A particle of mass m, collides at an angle (theta), with speed v, onto an infinite mass horizontal surface. Collision time is 0.2 seconds. What is the horizontal distance traveled by the particle...
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