1. A solid object can be deformed in threee fundamental ways. Consider a block o

Question

1. A solid object can be deformed in threee fundamental ways. Consider a block of steel that has sunk to the bottom of a lake. The deformation of the block due to water pressure is A. compression/tension B. shear C. bulk 2. A 3 meter long aluminum rod with uniform cross section is cut into a 2 m long piece and a 1 m long piece. Each piece supports a 650 N load. Which rod supports the greater tensile stress? A. The tensile stresses are the same B. The longer rod has the greater stress C. The shorter rod has the greater stress D. Cannot be determined from the given information

Explanation / Answer

Bulk modulus = Stress / Strain = Pressure / (Change in volume / volume) Then the first answer must be bulk Stress = F / A Force/Area Thus the tensile stress must be the same because both rods have the same area and support the same weight In this case Y (Young's modulus) = Stress / Strain = (F/A) / (Change length / length)

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