Afigure skater is spinning slowly with arms outstretched. she brings her arms in close to her body and her moment of inertia decreases by 1/2. her angular speed increases by a factor of

the angular velocity increase by a factor of 2

Explanation:

using the law of the conservation of the angular momentum

where is the inicial angular momentum and is the final angular momentum.

also, the angular momentum can be calculated by:

L = IW

where I is the inertia momentum and the W is the angular velocity.

so:

we know that then,

solving for :

second mirror gathers light from a faraway object and reflects it to another mirror. - a.

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.