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8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

a corroding iron, if that's one of your choices