# 2d rotational wall and the velocity magnitude in top??!!

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 May 2, 2013, 03:50 2d rotational wall and the velocity magnitude in top??!! #1 New Member   Reza Join Date: Sep 2010 Posts: 9 Rep Power: 6 Suppose that we have an edge as a blade as a rotational wall (2d problem), it rotates about its center. Radius of this blade= 10 m Rotational speed= 1 rad/ s I used moving reference frame, and I set the speed of rotational wall 0 (relative). Originally, the velocity magnitude in the top of the blade has to be 10 m/s. but I get it 7.8 m/s In fact the wall don't obey from: V=R.Omega also velocity magnitude in the axis is not zero m/s. What's the problem??? What's your idea??

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