What is the half-life of radium-226?

Awind turbine is initially spinning at a constant angular speed. as the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.173 rad/s2. after making 2870 revolutions, its angular speed is 132 rad/s. (a) what is the initial angular velocity of the turbine? (b) how much time elapses while the turbine is speeding up?

Which one of the following research methods can show cause and effect

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)