When researchers find a reasonably complete fossil of a dinosaur, they can determine the

Chapter 14, Problem 43

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When researchers find a reasonably complete fossil of a dinosaur, they can determine the mass and weight of the living dinosaur with a scale model sculpted from plastic and based on the dimensions of the fossil bones. The scale of the model is 1/20; that is, lengths are 1/20 actual length, areas are (1/20)2 actual areas, and volumes are (1/20)3 actual volumes. First, the model is suspended from one arm of a balance and weights are added to the other arm until equilibrium is reached. Then the model is fully submerged in water and enough weights are removed from the second arm to reestablish equilibrium (Fig. 14-42). For a model of a particular T. rex fossil, 637.76 g had to be removed to reestablish equilibrium. What was the volume of (a) the model and (b) the actual T. rex? (c) If the density of T. rex was approximately the density of water, what was its mass? 44 A wood block (mass 3.67 kg, density 600 kg/m3 ) is fitted with lead (density 1.14 104 kg/m3 ) so that it floats in water with 0.900 of its volume submerged. Find the lead mass if the lead is fitted to the blocks (a) top and (b) bottom. Figure 14-42 43.