Deuterium and helium could be made only during the nuclear epoch
Indicate whether the statement is true or false
FALSE
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Which of the following metals should not be in electrical contact with a critical structure made of low carbon steel that is used in a sea water environment?
(a) Cadmium (b) 2024 aluminum (c) Copper (d) Magnesium
A steel bolt (area 5 130 mm2, Es 5 210 GPa) is enclosed by a copper tube (length 5 0.5 m, area 5 400 mm2, Ec 5 110 GPa) and the end nut is turned until it is just snug. The pitch of the bolt threads is 1.25 mm. The bolt is now tightened by a quarter turn of the nut. The resulting stress in the bolt is approximately:
(A) 56 MPa
(B) 62 MPa
(C) 74 MPa
(D) 81 MPa
A quantity of a monatomic ideal gas expands to twice the volume while maintaining the same pressure. If the internal energy of the gas were U0 before the expansion, what is it after the expansion?
a. U0 b. 2U0 c. 4U0 d. The change in temperature must also be known to answer this question.
What is the lowest value for n of a shell that can contain a g electron?
a. 5 c. 3 b. 4 d. 6