Aditya lifts a book from the floor, carries it across the room and places it on a high shelf. when is aditya doing work on the book?

a) she does work in the book at no time during this process

b) she does work only while she carries the book across the room

c) she does work from the moment she touches the book until she lets go

d) she does work as she picks up the book and as she lifts it to the shelf

Option (D) is the correct answer.

Explanation:

The energy utilized to move an object from one place to another is known as work done.

For example, when Aditya lifts a book from the floor then an upward force is applied by him on the book due to which book moves away from the floor.

Then he places it on the shelf and the moment he left the book on the shelf work done is completed.

Thus, we can conclude that Aditya doing work on the book when she does work as she picks up the book and as she lifts it to the shelf.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

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