77. The disk rotates around a fixed axis so that the dependence of rotation angle on the time of the disk radius is given by the equation φ = At2 (A = 0,1 rad / s2). Determine the total acceleration a point on the rim to the disk of the second end of a second after the start of the movement, if the linear velocity of the point at this time is 0.4 m / s.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)