What type of system allows matter and energy to enter and exit

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?