How does the density of most metals compare to most non metals?

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .

Ain is , is 's of ? 0.62 0.79 1.27 1.50

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?