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

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.