Help on Moment of inertia again thanks =D

In summary, the conversation discusses a problem involving the moment of inertia of a man standing on a spinning turntable with his arms in different positions. The man's angular velocity is given in one scenario and the question is to find it in the other scenario. The conversation suggests considering if there is a torque acting on the man and finding a quantity that is conserved in both scenarios.
  • #1
iamtrojan3
56
0

Homework Statement


I need one more question answered =D thanks

A man is standing on a spinning turntable with a weight in each hand. His moment of inertia with arms outstretched is 16Nm. WIth his arms by his sdie his moment of Inertia is 6.4Nm. With arms outstreched he makes one rotation in 2 seconds. What is his angular velocity with his arms at his sides?


Homework Equations


i dont' even know where to start on this one


The Attempt at a Solution



none so far:confused:
 
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  • #2
no body knows? cry cry cry...
 
  • #3
Well, you should think if there is a torque acting on the man. If not, something might be conserved. You'll have to find out what, and write the equality between the quantity with arms outstretched and with arms on his side.
 

FAQ: Help on Moment of inertia again thanks =D

What is moment of inertia?

Moment of inertia is a physical property of an object that describes how difficult it is to change its rotational motion. It is the resistance an object has to changes in its rotational velocity.

How is moment of inertia calculated?

The moment of inertia of an object can be calculated by taking the sum of the products of each individual mass element in the object, and its distance from the axis of rotation squared.

What factors affect the moment of inertia of an object?

The moment of inertia of an object is affected by its mass, shape, and distribution of mass. Objects with more mass and/or mass located farther from the axis of rotation will have a greater moment of inertia.

Why is knowing the moment of inertia important?

Knowing the moment of inertia of an object is important in understanding its behavior and stability when rotating. It is also essential in calculating the angular acceleration and torque of an object.

How does moment of inertia relate to angular momentum?

Angular momentum is the product of an object's moment of inertia and its angular velocity. This means that an object with a larger moment of inertia will have a greater angular momentum for the same angular velocity.

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