Suppose that the moment of inertia of a skater with arms out and one leg extended is 3.0 kg⋅m2 and for arms and legs in is 0.90 kg⋅m2 . if she starts out spinning at 5.2 rev/s , what is her angular speed (in rev/s) when her arms and one leg open outward?

Her angular speed (in rev/s) when her arms and one leg open outward is

Explanation:

Initial moment of inertia when arms and legs in is

Final moment of inertia when her arms and on leg open outward,

Initial angular speed

Let the final angular speed be

Since external torque on her is zero so we can apply conservation of angular momentum

=>

=>

Thus her angular speed (in rev/s) when her arms and one leg open outward is

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.