Quiz (See related pages) 1 A material having a large spring constant will experience a greater change in length for a given applied force than a material with a small spring constant. A) True B) False 2 Stress is the relative change in the dimensions or shape of a body as the result of an applied force. A) True B) False 3 The ultimate strength of a material is the greatest stress it can withstand without rupturing. A) True B) False 4 The smaller the bulk modulus of a material, the higher its compressibility. A) True B) False 5 The radian may be a unit of strain. A) True B) False 6 The modulus of elasticity has the same units as stress. A) True B) False 7 Young’s modulus is constant for a particular material but varies with the length and cross-sectional area of a wire. A) True B) False 8 Water has a greater compressibility than steel. A) True B) False 9 Usually the shearing strain can be approximated by the tangent of the shearing angle. A) True B) False 10 Young’s modulus applies for compressive stresses as well as tensile stresses. A) True B) False 11 Two wires A and B, are made of the same material and are subjected to the same loads. The strain is greater for A when A) A is twice as long as B B) A has twice the diameter of B C) A has twice the length and half the diameter D) A has twice the diameter and half the length 12 A shearing stress acting on a body changes its A) shape B) volume C) length D) area 13 A unit for strain is the A) inch B) pound per square inch C) newton per centimeter D) radian 14 The volume strain for a constant applied force increases directly with an increase in A) surface area B) compressibility C) volume D) bulk modulus 15 According to Hooke’s law, an applied force will result in an elongation equal to A) ks B) s/k C) F/s D) F/k 16 The modulus of rigidity is another name for A) compressibility B) bulk modulus C) shear modulus D) Young’s modulus 17 When a force of 20 N produces an elongation of 0.4 cm, the spring constant is A) 5 N/cm B) 50 N/cm C) 8 N * cm D) 0.02 cm/N 18 The cross-sectional area of a 20-in. copper wire is 0.001 in.². A force of 400 lb causes a stress of A) 4 X 10^5 lb/in.² B) 0.4 lb/in.² C) 20 lb/in. D) 50 lb/in. 19 In Question 18 the Young’s modulus for copper is 17 X 106 lb/in.². The resultant elongation of the wire is approximately A) 0.012 in. B) 0.12 in. C) 0.47 in. D) 0.0047 in. 20 A mechanical press contains 2 m³ of oil (B = 1700 MPa). If the volume of the oil decreases by 2 X 10-8 m³, the applied pressure must be approximately A) 17 Pa B) 68 Pa C) 0.06 Pa D) 1.7 X 1017 Pa 21 Three types of stress are , , and . 22 The constant ratio of stress to strain is called the . 23 is the relative change in the dimensions or shape of a body as a result of an applied force. 24 Whenever a shearing stress is applied, the strain can be approximated by . 25 The reciprocal of the bulk modulus is called and is denoted by the symbol . 26 The stress on a body is the ratio of to . 27 The ultimate strength of a material is always its elastic limit. 28 Provided that the is not exceeded, an elastic strain is directly proportional to the . This is a statement of law. 29 The term elastic limit refers to the maximum a body can experience without becoming permanently deformed. 30 The only elastic modulus that applies for liquids is the .
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