Aschool has installed a modestly-sized wind turbine. the three blades are 4.0 m long; each blade has a mass of 45 kg. you can assume that the blades are uniform along their lengths. part a when the blades spin at 240 rpm, what is the kinetic energy of the blade assembly?

To solve the exercise it is necessary to apply the concepts related to kinetic energy by rotation and the moment of rotational inertia.

Rotational energy is defined as

Where,

I = Inertia moment

Angular velocity

While the Rotational inertia of each blade is given as

Where,

m= mass

l = length

We have also that the assembly of the motor has three blade, then the total rotational inertia is

Replacing with our values

We have the angular velocity in rev per minute then in rad per second is

Then the total Kinetic Energy at the system is

Therefore the total Kinetic Energy at the system is

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation: