The phase is called 3rd quarter.
Hope this helps:)
it includes an objects speed and direction
Answer:
The velocity of the blades is 88.185 m/s.
Explanation:
Given;
length of the blade, r = 80 m
angular speed, ω = 1 rev per 5.7 seconds
The velocity of the blades is calculated by applying the following circular motion equation that relates linear velocity (V) and angular speed (ω);
![V = \omega r\\\\V = (\frac{1 \ rev}{5.7 \ s} \times \frac{2 \pi \ rad}{ 1 \ rev} )(80 \ m)\\\\V = 88.185 \ m/s](https://tex.z-dn.net/?f=V%20%3D%20%5Comega%20r%5C%5C%5C%5CV%20%3D%20%28%5Cfrac%7B1%20%5C%20rev%7D%7B5.7%20%5C%20s%7D%20%5Ctimes%20%5Cfrac%7B2%20%20%5Cpi%20%5C%20rad%7D%7B%201%20%5C%20rev%7D%20%29%2880%20%5C%20m%29%5C%5C%5C%5CV%20%3D%2088.185%20%5C%20m%2Fs)
Therefore, the velocity of the blades is 88.185 m/s.
Kinetic energy is proportional to the square of the speed. So when anything or anybody speeds up, its kinetic energy increases.