Question

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?

She did more work with her right hand than with her left because the right was held up higher.
She did no work while she posed because she did not move the torch or the book.
She did work while she posed because she was tired at the end of the session.
She did no work while she posed because she did not exert a force on anything.

Answer 1

I think a is answer ..............

Answer 2

She did no work while she posed because she did not move the torch or the book.

Work done is described as the product of force and displacement.

Here, she applied force in order to hold the torch and the book but the displacement is zero.

There was no movement taking place and therefore work done is zero.However, internal work is said to be done since she was applying force in order to hold the objects in the right position, but scientifically no work is done in this case.