Kinetic Energy Of an rotating object

Duely Cack · Oct 13, 2008

1. A 75-g phonograph album of 30-cm diameter spins at 33.3 rpm. What is its kinetic energy?

LowlyPion · Oct 13, 2008

Duely Cack said:

1. A 75-g phonograph album of 30-cm diameter spins at 33.3 rpm. What is its kinetic energy?

Welcome to PF.

What are your thoughts on how to go about solving it.

Duely Cack · Oct 13, 2008

well i think that Kinetic Energy is 1/2mv²so is it like that but instead of v you put in the 33.3 rpm. like 1/2(75)(33.3)² maybe?

LowlyPion · Oct 13, 2008

Duely Cack said:

well i think that Kinetic Energy is 1/2mv²so is it like that but instead of v you put in the 33.3 rpm. like 1/2(75)(33.3)² maybe?

What is the moment of inertia of the phonograph?

Using the moment of inertia what is the formula then for rotational kinetic energy?

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