Abook weighing 5 n rests on top of a table. a downward force of magnitude 5 n is exerted on the book by the force of do the downward force in part a and the upward force in part b constitute a 3rd law pair? the reaction to the force in part a is a force of magnitude exerted on the by the its direction is .

A book weighing 5 N rests on top of a table. A downward force of magnitude 5 N is exerted on the book by the force of gravity.

Do the downward force in Part A and the upward force in Part B constitute a 3rd law pair? Yes

The reaction to the force in Part A is a force of magnitude 5 N, exerted on the book by the table. Its direction is upward .

Explanation:

According to Newton's third law of motion, when two bodies interact between them, appear equal forces and opposite senses in each of them.  

To understand it better:  

Each time a body or object exerts a force on a second body or object, it (the second body) will exert a force of equal magnitude and direction but in the opposite direction on the first.

In the case of the book in the figure, the 5 N force exerted downwards due gravity is equal to the 5 N force exerted upwards by the table (Normal force).

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jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.