Flywheel Question?? Hi all I have done the following question: A flywheel , intially rotating at a speed of 600 rev/min, is brought to rest with uniform angular deceleration in 10 seconds. A) How many revolutions does the flywheel make before coming to rest? I used Pheta = (Wo + W)t/2 to get 314.16 rads. The I used 314.16/2Pi to get 50 revolutions B)Determine the magnitude and direction of the resultant linear acceleration of a point A on the flywheel 0.5seconds before coming to rest. Assume the point A is positioned at a fixed radius of 150mm from the axis of rotation. I firstly worked out angular acceleration to be -6.2832 rads/sec. I then found W to be 3.14 rads/sec. Using the formula for radial acceleration (ar) = w^2r I got 1.4804. And for tangential acceleration i got -0.94248. Therefore the resultant linear acceleration using pythagorus is 1.755. The resultant angle is tan-1(-0.94/1.48) = -32.48 degrees. Now whats confusing me is all the minus signs. Is this a legit answer??? The minus angle is confusing me? The final question is: C) Draw a vector diagram showing the maginitude and direction of the resultant linear acceleration and its radial and tangential components?? Shall I draw the vector diagram using the answers above. So it will end up being in the 3rd quadrant???? Cheers Do I just use the minus values worked out above.