You stand on a frictionless platform that is rotating with an angular speed of 5.1 rev/s. Your arms are outstretched, and you hold a heavy weight in each hand. The moment of inertia of you, the extended weights, and the platform is 9.9 kg · m2 . When you pull the weights in toward your body, the moment of inertia decreases to 2.6 kg · m 2 . What is the resulting angular speed of the platform? Answer in units of rev/s. 017 (part 2 of 2) 10.0 point

Explanation:

Given:

angular speed of rotation of friction-less platform,

moment of inertia with extended weight,

moment of inertia with contracted weight,

Now we use the law of conservation of angular momentum:

The angular speed becomes faster as the mass is contracted radially near to the axis of rotation.

answer: (431,2)

step-by-step explanation:

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )