Tiêu đề مكمل شابتر 8 المرونة.pdf ✅

Physics 104 ئلة ِ ْ مل األس ِ َ ك ُ م References - Physics by Kane and Edition th Sternheim 3 - Doctors Notes - Past years Questions Premedical Physics اإلجابات مرفقة Chapter 8 : Elasticity
أحمد العزام 0780938042 1 | P a g e Q1) A 2m long bar has rectangular cross section, 0.02 m by 0.04 m. If it is subjected to a 10000-N force along its length, what is the stress? A) 1. 25 × 105 N/m2 B) 1. 25 × 107 N/m2 C) 2. 5 × 107 N/m2 C) 2. 5 × 107 N/m2 Q2) A 0.4m pipe under compressional stress changes length by 0.005 m. What is the strain in the pipe? A) 0.0125 m B) 0.025 m C) 0.0015 m D) 0.024 m Q3) Hooke's law states that : A) the extension is proportional to the load when the elastic limit is not exceeded B) the extension is inversely proportional to the load when the elastic limit is not exceeded C) the extension is independent of the load when the elastic limit is not exceeded D) load is dependent on extension Q4) The largest tension strain that can occur before fracture in aluminum is 0.003. What is the maximum change in length of a 2-m aluminum pipe? A) 0.003 m B) 0.001 m C) 0.002 m D) 0.006 m Q5) A man’s leg can be thought of as a shaft of bone 1.2 m long. If the strain is 1. 3 × 10−4 when the leg supports his weight, by how much is his leg shortened ? A) 2. 08 × 10−4 m B) 1. 56 × 10−4 m C) 2. 34 × 10−4 m D) 1. 04 × 10−4 m Q6) A rod with a radius of 0.05 m and a length of 2 m stretches 0.002 m when subjected to a tension force of 10000 N. What is Young’s modulus for this rod ? A) 1. 27 ∗ 1011 N/m2 B) 2. 53 ∗ 1011 N/m2 C) 5. 24 ∗ 1011 N/m2 D) 3. 36 ∗ 1011 N/m2
أحمد العزام 0780938042 2 | P a g e Q7) An aluminum wire is 20 m long and has a radius 2mm . the linear limit for aluminum is 0. 6 × 108 N/m2 . How much will the wire stretch when this force applied ? YAl = 7 × 1010 N/m2 A) 5.23 m B) 7.13 m C) 17.14 m D) 15.23 m Q8) A rubber band has a circumference of 0.4 m when it is unscratched. The rubber has a rectangular cross section, 0.01m by 0.001m. What is 1 × 10 ) 6 N/m2 the spring constant of the rubber band ? ( the Yrubber is A) 8 × 1010 N/m B) 2 × 1010 N/m C) 4 × 1010 N/m D) 6 × 1010 N/m Q9) An object put on a table with four legs. Both the table and the object together have the mass of 15 kg . If the radius of the table's leg was 1 cm. Find the pressure put on each leg. A) 11. 95 × 104 N/m2 B) 191. 1 × 104 N/m2 C) 23. 9 × 104 N/m2 D) 47. 78 × 104 N/m2 Q10) A 200 kg load is hung on a wire of length 4. 00 m, cross-sectional area 0. 200 × 10−4 m2 , and Young’s modulus 8. 00 × 1010 N/m2 . What is its increase in length? A) 12.5 mm B) 5.0 mm C) 10.0 mm D) 8.0 mm Q11) Bone has Young's modulus of 1. 5 × 1010 N/m2 . A femur bone in the leg has minimum effective diameter of 4.50 cm and 40 cm length. Under compression, it can withstand a maximum force 3. 18 × 105 N before it breaks. Calculate the amount of compression that this bone can withstand. A) 4.8 mm B) 3.2 mm C) 5.3 mm D) 6.6 mm Q12) A femur bone of length 30 cm and diameter 2.5 cm is subjected to a . Find the decrease in its length if the 8 N/m2 compressive stress of 1.5 x10 . 10 N/m2 Young’s modulus of bone is 1.5 x10 A) 0.80 cm B) 0.60 cm C) 0.30 cm D) 0.25 cm