Gina pushes a book across a table at constant speed. Fatima lowers a book from a...

Gina pushes a book across a table at constant speed. Fatima lowers a book from a high shelf down to her waist, where it comes to rest. Isidra holds a book at her waist while carrying it up stairs. Jin holds a book at her waist while carrying it across the room at constant speed. Who does zero work on their book?

A. Gina

B. Fatima

C. Isidra

D. Jin

Solutions

Expert Solution

Gina pushes the book across the table. The direction of displacement ( either towards the right side or towards the left side) and the direction of force ( i.e. the weight of the book) are perpendicular to each other. Thus, Gina does zero work on her book.

Fatima lowers a book from a high shelf down to her waist. The direction of displacement of the book and the force ( the weight of the book) on it are acting along the same line ( i.e in the downward direction). Fatima has to do some work (which is not zero).

Isidra holds a book at her waist while carrying it upstairs. The direction of displacement of the book (upward) and the force ( the weight of the book) on it ( in the downward direction) are acting in the opposite direction. Isidra has to do some work (which is not zero).

Jin holds a book at her waist while carrying it across the room. If the there is no vertical displacement of the book, the direction of displacement ( either towards the right side or towards the left side) and the direction of force ( i.e. the weight of the book) are perpendicular to each other. Thus, JIn does zero work on her book.

Option (A) and (D) are correct.

genius_generous answered 1 year ago

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