Rate of rotational inertia help

AI Thread Summary
To solve the problem of the figure skater's new rate of rotation after reducing her rotational inertia, the principle of conservation of angular momentum is key. Angular momentum is defined as the product of rotational inertia and angular velocity, which must remain constant in an isolated system. Given that the skater's initial rate is 1.6 rev/s and her rotational inertia decreases to 64% of its original value, the new rate of rotation can be calculated using the equation L = Iω, where L is angular momentum, I is rotational inertia, and ω is angular velocity. By applying this equation, the new rate of rotation can be determined. Understanding the relationship between rotational inertia and angular velocity is essential for solving this problem.
jmb07
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I need some help just getting moving on this problem...

A figure skater is spinning at a rate of 1.6 rev/s with her arms outstretched. She then draws her arms in toward her chest reducing her rotational inertia to 64% of its original value. What is her new rate of rotation??

I'm not sure how to relate the rate to the inertia...
 
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jmb07 said:
I need some help just getting moving on this problem...

A figure skater is spinning at a rate of 1.6 rev/s with her arms outstretched. She then draws her arms in toward her chest reducing her rotational inertia to 64% of its original value. What is her new rate of rotation??

I'm not sure how to relate the rate to the inertia...
What is the equation which defines the angular momentum of a body?
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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