Answer:
Explanation:
The equation for density is:
We plug in the given values:
Mg gained mass because it went from being a single element (on the reactant side) to being a molecule (on the product side).
"Work done by a constant force on an object is the product of the force and the distance moved by the object in the direction of the force" -textbook
There is work done ONLY if the direction of the force and the direction the item is moving are the same. In figure A, the direction of the force (the lifting) is upwards (defying gravity), and the book is moving upwards, so work is done. In figure B, the force is still moving upwards (the person is carrying the books) but the book is moving to the right, so there is NO work done.
The movement of water on and above the earth's surface is called the hydrologic cycle, or the water cycle. Hope this helps!
