If low density is the primary design requirement, what class of material discussed in this chapter would you first investigate for suitability?
What will be an ideal response?
polymers
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A copper specimen is stressed in tension to 76×106 Pa and a total strain of 0.01; then the specimen is unloaded. We observe after the test that the deformation was uniform. Determine the expected recovered elastic strain and the permanent plastic strain.
What will be an ideal response?
A titanium bar (E 5 100 GPa, ? 5 0.33) with square cross section (b 5 75 mm) and length L 5 3.0 m is subjected to tensile load P 5 900 kN. The increase in volume of the bar is approximately:
(A) 1400 mm3
(B) 3500 mm3
(C) 4800 mm3
(D) 9200 mm3
A source emits sound at a fixed constant frequency f.If the temperature of the air rises, the frequency you hear is
a. the same as f. b. higher than f. c. lower than f. d. unrelated to f.
The elapsed time between two successive crossings of the same meridian by a star other than the Sun is known as the ______________ day
Fill in the blank(s) with correct word