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# pex3sm08 - August 5 2008 PHY 2053 Discussion Practice Exam...

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August 5, 2008 PHY 2053 Discussion Practice Exam 3 (Chapter 9, 13-14) 1. Consider two steel rods, A and B. B has three times the area and twice the length of A, so Young’s modulus for B will be what factor times Young’s modulus for A? (Deformation of Solids-tensile force) a. 3.0 b. 0.5 c. 1.5 d. 1.0 2. The bulk modulus of a material, as a meaningful physical property, is applicable to which of the following? (Deformation of Solids-bulk force) a. only solids b. only liquids c. only gases d. solids, liquids and gases 3. A 15 000-N car on a hydraulic lift rests on a cylinder with a piston of radius 0.20 m. If a connecting cylinder with a piston of 0.040-m radius is driven by compressed air, what force must be applied to this smaller piston in order to lift the car? (Pascal’s Principle) a. 600 N b. 1 500 N c. 3 000 N d. 15 000 N 4. A piece of aluminum has density 2.70 g/cm 3 and mass 775 g. The aluminum is submerged in a container of oil of density 0.650 g/cm 3 . A spring balance is attached with string to the piece of aluminum. What reading will the balance register in grams for the submerged metal? (Buoyant

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pex3sm08 - August 5 2008 PHY 2053 Discussion Practice Exam...

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