Pure Rotation - Example Problem 4.2-6

The blades on the wind turbine are turning with an angular speed of ω_o = 30 rpm in the clockwise direction. If the blade length is L = 120 ft and they are given a constant angular acceleration of α = 0.2 rad/s² in the clockwise direction, determine the angular velocity and the magnitude of the acceleration of point A on the tip of the blade when t = 1 minute.

Given:

• ω_o = 30 rpm
• α = 0.2 rad/s²
• L = 120 ft
• t_f = 1 minute.

Find:

• a_A

The following video walks you through the solution to this problem. It is suggested that you try solving the problem first and then, if you have difficulties with the solution, watch the video for help.

Think about what we know and how we can get what we need to find.

What do we need to calculate before we can find a_A.