# When researchers find a reasonably complete fossil of a dinosaur, they can determine the mass and weight of the living

## Question:

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 l/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 (Figure). 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?

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**Related Book For**

## Fundamentals of Physics

**ISBN:** 978-0471758013

8th Extended edition

**Authors:** Jearl Walker, Halliday Resnick

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