Giancoli's Physics: Principles with Applications, 6th Edition
9
Static Equilibrium; Elasticity and Fracture
Change chapter

9-1 and 9-2: Equilibrium
9-3: Muscles and Joints
9-4: Stability and Balance
9-5: Elasticity; Stress and Strain
9-6: Fracture
9-7: Arches and Domes

Problem 9
A
a) $l_1 = 2.3 m$ from adult
b) $l_1 = 2.5 m$ from adult

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By norman on Tue, 1/17/2012 - 12:29 PM

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By kitaya on Sat, 2/28/2015 - 5:13 AM

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.

By Mr. Dychko on Mon, 3/2/2015 - 11:06 PM

Hi kitaya, thanks for the feedback. The technique you describe would be correct, and more efficient, as you say. It's a matter of personal preference, and it's good that you have a technique that works for you.

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