Question

kg book is lying ona 0.80 m -high table. You pick it up and placeit on a bookshelf 2.2 mabove the floor.a.During this process, how much work does gravity do on thebook. Express your answer to two significant figuresand include the appropriate units.b. During this process, how much work doesyour hand do on the book?Express your answer to two significant figures and include theappropriate units.

Answer 1

The work done by gravity is  43 J while the work done by your habd is 27 J.

What is the work done?

We know that all over the earth is a large gravitational field. If an object is placed at a given height, the kind of energy that the object would be said to possess at that height is the gravitational potential energy. This is the kind of energy that a body would have because it is found at a given height on the earth surface.

Now, we know that gravity does some work on the book as it found to be at a position of about 2.2 on top of the shelf. The work that is done by the force of gravity on the book is obtained as;

W = mgh

W = work done

m = mass

g = acceleration due to gravity

h = height

W = 2 * 9.8 * 2.2

= 43 J

The work that is done by your hand =

W = 2 * 9.8 (2.2 - 0.8)

= 27 J

Learn more about work done:brainly.com/question/10334435

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