Rotational kinetic energy of a rigid object (8-7)

Question 1 of 3

Question

$\textbf{Angular speed}$ of the object

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Question

$\textbf{Rotational kinetic energy}$ of a rigid body spinning around an axis

{"title":"Rotational kinetic energy of a rigid body spinning around an axis","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"2,22,36,59\"}]"} {"title":"Moment of inertia of the object for that rotation axis","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"235,26,251,60\"}]"} {"title":"Angular speed of the object","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"255,34,284,64\"}]"}

Question

$\textbf{Moment of inertia}$ of the object for that rotation axis

{"title":"Rotational kinetic energy of a rigid body spinning around an axis","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"2,22,36,59\"}]"} {"title":"Moment of inertia of the object for that rotation axis","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"235,26,251,60\"}]"} {"title":"Angular speed of the object","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"255,34,284,64\"}]"}

Review

We can use Equation 8-6 to write the expression for rotational kinetic energy, Equation 8-5, in terms of the moment of inertia: