3. A boy of mass, 25.0 kg is swinging at the park. Model the boy as a point mass on the seat of the swing. The boy moves from the lowest to highest point of his swing along a circular arc of arc length 1.31 m. The corresponding magnitude of the boy's displacement is 1.29 m with a horizontal component of 1.25 m and a vertical component of 0.335 m. (a) [5] As the boy rises from the lowest to highest point, how much work does the gravitational force do on the boy? Give a numerical answer, and justify your result either with words or equations. (b) [5 During the same motion, how much work does the seat of the swing do on the boy? Give a numerical answer, and justify your result either with words or equations.

3. A boy of mass, 25.0 kg is swinging at the park. Model the boy as a point mass on the seat of the swing. The boy moves from the lowest to highest point of his swing along a circular arc of arc length 1.31 m. The corresponding magnitude of the boy's displacement is 1.29 m with a horizontal component of 1.25 m and a vertical component of 0.335 m. (a) [5] As the boy rises from the lowest to highest point, how much work does the gravitational force do on the boy? Give a numerical answer, and justify your result either with words or equations. (b) [5 During the same motion, how much work does the seat of the swing do on the boy? Give a numerical answer, and justify your result either with words or equations.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Conservation Of Energy

Section: Chapter Questions

Problem 81P: Jane, whose mass is 50.0 kg, needs to swing across a river (having width D) filled with...

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