Shani poses as the Statue of Liberty for an art class. She holds a torch above her head with her right hand and a book against her side with her left hand. She holds the pose for ten minutes. At the end of the session, she mentions to her friend that it was a lot of work to pose and that her arms are really tired.Which describes the work Shani did while she posed?(assume the starting work position is when her hand is already raised )
Answer
A
She did more work with her right hand than with her left because the right was held up higher.
B
She did no work while she posed because she did not move the torch or the book.
C
She did work while she posed because she was tired at the end of the session.
D
She did no work while she posed because she did not exert a force on anything.
Explanation
In physics, work is done when a force causes an object to move in the direction of that force. Shani held the torch and book still throughout the pose, so neither object moved and she did no mechanical work on them while posing. Feeling tired does not by itself mean that mechanical work was done; choice B is correct.
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