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12 September, 07:09

There are six books in a stack, and each book weighs 5 N. The coefficient of static friction between the books is 0.2. With what horizontal force must one push to start sliding the top five books off the bottom one? a. 1 N c. 3 N b. 5 N d. 7 N

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  1. 12 September, 07:37
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    b. 5 N

    Explanation:

    Each book weighs 5 N. Therefore, five books weigh 25 N. The friction force is:

    Ff = Fn μ

    Ff = (25 N) (0.2)

    Ff = 5 N
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