What is the difference between crystalline and amorphous solids?

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?

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

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c