What Holds Up the Top Two Books?

Difficulty: Easy · Topics: Newton's Laws, Equilibrium, Normal Force

Yuqoridagi ikki kitobni nima ushlab turibdi?

Three books rest on a table as shown: A weighs 5.0 N, B weighs 7.0 N and C weighs 10.0 N.

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What is the magnitude of the force, in N, that book C exerts on book B?