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Giancoli 7th Edition, Chapter 4, Problem 62

(1:36)

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Recent Comments

Why not start (a) with Torque equation 245Nd=735N(9-d) and d= distance between child and pivot. Then solve for d is easy. Pivot is 6.75 m away from child. That approach is simpler than what is shown.

Hello why E of S is the same if I said S of E

Can y explain the part B and B because I don't understand why change the direction. Please.

No need to apologize ljn8, we all make mistakes.

Cheers,
Mr. Dychko

Hi joseotilio25, please see my answer to your question about why the trains had the same elapsed time here: https://www.giancolianswers.com/giancoli-physics-7th-edition-solutions/c.... Instead of trains, this question has Sally and Mary, but otherwise it's the same idea.

Good luck!
Mr. Dychko