PEDS200 Lecture : Body Composition

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tanbeaver257

17 Dec 2011

School

University of Alberta

Department

Physical Education and Sport

Course

PEDS200

Professor

Dan Syrotuik

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Document Summary

Too low: loss function, weakness, endocrine/immune disfunction, bone/muscle mass loss. Dual energy x-ray absorption (dexa): 3 compartment model: lean soft tissue, fat soft tissue, bone, low radiation to scan whole body, regional and whole body data. Indirect assessment: clinically convenient: bmi, bia, nir, skinfolds, girths, lab methods: dexa, underwater, ultra-sound, x-ray, mri. Underwater weighing: measures density of a body: fat: 0. 9g/ml, lbm: 1. 1g/ml, body density=body mass/body volume, volume: water displaced by object, loss of weight of an object. High intensity interval exercise: uses fat for recovery, greater epoc, incr.

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Textbook Problem

Two square plates of sides ℓ are placed parallel to each other with separation d as suggested in Figure P25.39. You may assume d is much less than ℓ. The plates carry uniformly distributed static charges +Q₀ and −Q₀. A block of metal has width ℓ, length ℓ, and thickness slightly less than d. It is inserted a distance x into the space between the plates. The charges on the plates remain uniformly distributed as the block slides in. In a static situation, a metal prevents an electric field from penetrating inside it. The metal can he thought of as a perfect dielectric, with κ → ∞. (a) Calculate the stored energy in the system as a function of x. (b) Find the direction and magnitude of the force that acts on the metallic block. (c) The area of the advancing front face of the block is essentially equal to ℓd. Considering the force on the block as acting on this face, find the stress (force per area) on it. (d) Express the energy density in the electric field between the charged plates in terms of Q₀, ℓ, d, and ϵ₀. (e) Explain how the answers to parts (c) and (d) compare with each other.

Figure P25.39

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PEDS200 Lecture : Body Composition

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Physics: Principles with Applications

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