1. The rotating disk of radius 0.4 m starts from rest at an angular acceleration of 7 t^(1/2) rad/s^2 ccw, where t is in seconds. Determine the angular speed it reaches in rad/s at a point on its circumference, when 2 seconds have passed. Enter the units and the direction.

2. A disk of radius 0.4 m begins to rotate from rest at an angular acceleration of 9 t^(1/2) rad/s^2 ccw, where t is in seconds. Determine the acceleration in the normal component that it reaches in 6.5 seconds. Enter the units.

3. A disk of radius 0.4 m begins to rotate from rest at an angular acceleration of 4.3 t^(1/2) rad/s^2 ccw, where t is in seconds. Determine the acceleration in the tangential component that it reaches in 3.9 seconds. Enter the units.