【单选题】One end of a steel rod of radius R = 9.5mm and length L = 81cm is held in a vise (钳子) . A force of magnitude F = 62kN is then applied perpendicularly to the end face (uniformly across the area) at the...
A.
stress = 3.2x10 8 N/m 2 , Δ L = 8.9x10 -4 m, strain = 0.11%
B.
stress = 2.2x10 8 N/m 2 , Δ L = 9.9x10 -4 m, strain = 0.11%
C.
stress = 2.2x10 8 N/m 2 , Δ L = 8.9x10 -4 m, strain = 1.11%
D.
stress = 2.2x10 8 N/m 2 , Δ L = 8.9x10 -4 m, strain = 0.11%
【简答题】ysis and calculation questions: u he sieve ysis results of sand is as follows: Sieve size/mm 4.75 2.36 1.18 0.60 0.30 0.15 <0.15 Weight/g 20 65 85 90 110 110 20 Please answer: a) What is the f...
【简答题】Young’s modulus for an elastomer at 25 O C is 3MPa, What is the shear modulus? What is the stress if a sample 1cm ́ 1cm ́ 10cm is stretched to 25cm length at 100 O C?