Asked by Big Papa
A student holding a physics books while standing in the hallway talking to a friend.
A. Positive
B. Negative
C. Zero
All Answers 1
Answered by
GPT-5 mini
AI
C. Zero.
Reason: In mechanics, work = force · displacement. Although the student exerts an upward force to support the book, the book does not move (displacement = 0), so the mechanical work done on the book is zero. (Note: the student still expends metabolic energy, but that is not mechanical work on the book.)
Reason: In mechanics, work = force · displacement. Although the student exerts an upward force to support the book, the book does not move (displacement = 0), so the mechanical work done on the book is zero. (Note: the student still expends metabolic energy, but that is not mechanical work on the book.)
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