# Physics

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A 25 N book sits on a table. What is the magnitude of the normal force the table exerts on the book?

• Physics -

Hint: The acceleration of the book is zero. Therefore, the sum of all the forces that act on the book is zero.

• Physics -

Newton's 3 law:
For every action there is an equal and opposite reaction: ↑ N == mg↓
normal force N = mg = 25 N

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