A steel pipe (E 5 190 GPa, ? 5 14 3 1026/°C, column d2 5 82 mm, and d1 5 70 mm) of length L 5 4.25 m is subjected to a temperature increase DT. The column is pinned at the top and fixed at the bottom. The temperature increase at which the column will buckle is approximately:
(A) 36 8C
(B) 42 8C
(C) 54 8C
(D) 58 8C
(D) 58 8C
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Isothermal aging curves in Figure 7.17 show that peak yield strength at aging temperatures of 450°F (232°C) and 500°F (260°C) occurs in times of 100.6 hours (4 hours) and 10-0.6 hours (0.25 hours), respectively. Calculate the activation enthalpy for precipitate formation in this alloy.
What will be an ideal response?
Compared to the sum of the masses of its constituents, the mass of a nucleus is
A. the same. B. greater. C. less. D. greater, less or the same.
Which of the following characterizes the net force on a particle falling through a fluid at its terminal speed?
a. It is at a maximum. c. It is downwards. b. It is upwards. d. It is zero.
If an equivalent amount of work is done in a shorter period of time
A. more power is required B. the same amount of power is required C. less power is required