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The discussion focuses on solving a physics homework problem involving centripetal acceleration and projectile motion. The formula for centripetal acceleration is needed to find the tangential velocity of a ball exiting a tube horizontally. It is assumed that there is no air resistance, allowing for a constant horizontal velocity. Once the ball leaves the tube, it begins to fall under gravity, leading to an increasing downward velocity. By knowing the horizontal velocity and the time the ball is airborne, the total distance traveled can be calculated.
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http://tinyurl.com/hjybb

thats a picture of the problem, anyone know how to solve it??
 
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Write the formula for centripetal acceleration.

From that, determine the tangential velocity, which when the ball leaves the tube, is horizontal, i.e. in +x-direction, so that gives vx.

Assuming no air resistance, what can one assume about the horizontal velocity?

Now as soon as the ball leaves the tube, it starts to fall, so there is a downward vy which increases downward with acceleration of gravity. From this one can determine the time that the ball air airborne.

Know vx and t in air, one can determine the distance traveled.
 
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