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Direct linkBartlett, Albert A. – Physics Teacher, 2006
Several times a week I walk by a metal chair that is fastened to a flat concrete slab at an outdoor bus stop here in Boulder. One day I noticed on the concrete a nice shadow image of the woven metal seat of the chair (Fig. 1). The seat and back of the chair are formed from 3.8-cm wide strips of metal spaced 3.8 cm apart. The seat is about 39 cm…
Descriptors: Measurement, Spatial Ability, Scientific Concepts, Scientific Principles
