A dancer is spinning at $72rpm$ about an axis through her center with her arms outstretched, as

shown in $($Figure $1).$ From biomedical measurements, the typical distribution of mass in a human body

is as follows:

Head: $7\mathrm{.}0\%$

Arms: $13\%($for both$)$

Trunk and legs: $80\mathrm{.}0\%$

Suppose the mass of the dancer is $55\mathrm{.}0kg,$ the diameter of her head is $16cm,$ the width of her trunk

and legs is $24cm,$ and her arms are $60cm$ long each.

Figure

$1$ of $1$

Part A

Calculate moment of inertia about dancer spin axis.

Express your answer with the appropriate units.

$I=$

Part B

Calculate your rotational kinetic energy.

Express your answer with the appropriate units.

Previous Answers

Request Answer

Incorrect; Try Again; $3$ attempts remaining