The problem involves calculating the work done on a book by a student librarian as he lifts and carries it. The context includes the mass of the book, the heights involved, and the distance carried.
The discussion is ongoing, with participants clarifying definitions and values related to mass and gravitational force. Some guidance has been provided regarding the calculation of work done against gravity, but no consensus has been reached on the correct interpretation of the problem.
There is confusion regarding the values for mass and gravitational acceleration, as well as the total vertical distance considered in the work calculation. Participants are questioning assumptions about these values and their relevance to the work done.
itsmarasilly said:Homework Statement
A student librarian picks up a 2.2 kg book from the floor to a height of 1.10 m. He carries the book 7.9 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book?
Homework Equations
work=force(netdisplacement)=mg*(.35)
The Attempt at a Solution
work = ?(7.9-1.1)
work = ?(6.8) = 2.2(.35)
olgranpappy said:Only the displacement parallel to the force matters. Thus it was correct for you to use 0.35 meters in your equation. Now, tell us: what is m? what is g? what is mg?
itsmarasilly said:m = 1.10 or 7.9
g = 2200
mg = 2,200,000
no.itsmarasilly said:m = 1.10 or 7.9
olgranpappy said:no.
m is not 1.10 or 7.9.
m is the mass of the book. what is the mass of the book?