Question

Stars form from clouds of gas and dust. As a protostar gravitationally contracts within its parent cloud, "conservation of angular momentum" says thatA) the protostar rotates more slowly.b) the protostar\'s rotation does not change.c) the protostar\'s axis of rotation will change direction.d) the protostar rotates more quickly.

Answer 1

D) True. the protostar rotates more quickly.

Step-by-step explanation:

If the system is isolated, the angular momentum must be retained.

Initial

L₀ = I w₀

Final

`L_(f)` =
`I_(f)`
`w_(f)`

L₀ =
`L_(f)`

I w₀ =
`I_(f)`
`w_(f)`

`w_(f)` = I /
`I_(f)` w₀

In general, the radius of the cloud decreases significantly to form the star, the moment of inertia must decrease, so the angular velocity must increase

Let's examine the answers

A) False. The opposite happens

B) False. Speed ​​changes

C) False. For this there must be an external force, which does not exist

D) True. You agree with the above