Physics Help2I!!!

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There are six books in a stack, and each book weighs 5N. The coefficient of 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?

I got 7N, but i think it is wrong. How can I solve it right??

  • Physics Help2I!!! -

    I really,really need help. Please?

  • Physics Help2I!!! -

    let mu be the coeff of friction.

    mu(5*5N)=Force

  • Physics Help2I!!! -

    i have a question in here, what is the friction coefficient between the books and the table if those books sit on the table.

  • Physics Help2I!!! -

    it is 7

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