Fill in the blank . Imagine that you are holding a book weighing 4 N at rest on the palm of your hand . . a downward force of magnitude 4 N is exerted on the book by _is exerted on by the hand . b. an upward force of magnitude c. is the upward force in part (b) the reaction force to the downward force in part (a)? d. the reaction force to the downward force in part (a) is a force of magnitude exerted on by . Its direction is exerted on e. the reaction to the force in part (b) is a force of magnitude by . Its direction is the forces in parts (a) and (b) are equal and opposite because of Newton's law f. 8 - the forces in parts (b) and (e) are equal and opposite because of Newton's law . Now suppose that you exert an upward force of magnitude 5 N on the book . h. does the book remain in equilibrium ? i. is the force exerted by your hand on the book equal to the force on the book by the Earth ? _ is the force exerted by the Earth on the book equal to the force exerted by the book on the Earth ? k. is the forece exerted on the book by your hand equal and opposite to the force exerted on your hand by the book . Finally, suppose you snatch your hand away while the book is moving upward. 1. how many forces act on the book ? m. is the book in equilibrium