Physics

Question

What is the acceleration of an object that has a velocity of 18 m/s and is moving in a circle of radius 30m?

2 Answer

  • Acceleration = V^2/r = 18^2/ 30 = 10.8 m/s^2

  • Well, first of all, 18 m/s is the object's speed, but not its velocity.
    Velocity consists of the object's speed AND direction, and this
    particular object's direction is constantly changing, since it's
    moving around a circle.  So its velocity is constantly changing too.

    Centripetal acceleration  =  (speed)² / (radius)

                                               =  (18 m/s)² / (30 m)

                                               = (324 m²/s²) / (30 m)

                                               =       10.8 m/s²

                                           (about  1.1 G)   
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