What is its speed when it is very far away from the earth?

Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?

What are similarities and differences of reflection, refraction, diffraction and absorption?

What are atoms of the same element with varying number of neutrons