Which of the following is a compound?

(a) brass
(b) rust
(c) iron
(d) steel

Identify the type of synthetic material used in each object

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 the applications of electromagnetic waves