The Earth rotates on its axis. what is it's axis.​

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?

Which system of units is used by only a small number of countries in the world, including the u.s.

Does the earth behave like a magnet how do you prove it