(10%) Problem 10: A hlstory book 1s lylng on top or a phys1cs book on a desk, as displayed on the right. A pair of free-body diagrams are also shown on the right. Noting that the weight of an object is the force due to its gravitational attraction to the Earth, the rst letter of each of the bodies is used when labeling the forces. I: History book Physrcs book 'I'h uh - E611 is the force of the Earth on the history book. 0 F Cl, is the force of the Earth on the physics book. ' . o F ph is the normal force force of the physics book on the history book. \"I on '.. O o F hp is the normal force force of the history book on the physics book. 0 Ed}, is the normal force force of the desk on the physics book. Assum that the positive direction is vertically upwards. The weights of the history and physics textbooks are 15.1 N and 72.2 N , respectively. A 20% Part (a) Examine the free-body diagram for the history book. Using your knowledge of Newton's laws, enter an expression for the magnitude, in terms of the variables introduced in the problem statement, of the normal force of the physics book acting on the history book. Grade Summary F ph = l Deductions Potential 100% E I B b ( I 7 9 I Submissions Attempts remaining: _ C I d Feh I 4 6 I (_ per attempt) Fep I g h I 1 2 3 I detailed View j I k m + - I 0 I n | P s x/() I Submit I Hint I I I give up! I Hints: deduction per hint. Hints remaining: _ Feedback: deduction per feedback. - A 20% Part (b) What is the magnitude, in newtons, of the normal force of the physics book on the history book? - A 20% Part (c) What is the magnitude, in newtons, of the force exerted on the physics book by the Earth? - A 20% Part ((1) What is the magnitude of the normal force of the history book acting on the physics book. - A 20% Part (e) Examine the free-body diagram for the physics book. What is the magnitude, in newtons, of the normal force of the desk acting on the physics book