For silver at a tensile stress of 300 MPa and a temperature of 200°C, what is the primary creep mechanism?
What will be an ideal response?
From Appendix B the melting temperature of silver is 962°C = 1235 K.
From Table 6.1 the shear modulus of silver is 30.3 GPa.
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Which of the following happens when a star runs out of hydrogen at its center?
A) The core of the star expands. B) The outer layers of the star heat up. C) The star moves toward the lower left in the Hertzsprung-Russell diagram. D) The stellar core becomes almost pure helium
Most of the energy emitted by the Sun is generated in the
a. corona. b. photosphere. c. chromosphere. d. core.
Active galactic nuclei are usually powered by supermassive black holes
Indicate whether the statement is true or false
How long between the evolution of single versus multicellular organisms?
A) 4.5 billion years B) 2.5 billion years C) one billion years D) 600 million years E) 63 million years