A beam is pin-connected to the tops of two identical pipe columns, each of height h, in a frame. The frame is restrained against sidesway at the top of column 1. Only buckling of columns 1 and 2 in the plane of the frame is of interest here. The ratio (a/L) defining the placement of load Qcr, which causes both columns to buckle simultaneously, is approximately:
(A) 0.25
(B) 0.33
(C) 0.67
(D) 0.75
(B) 0.33
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In a hydrogen atom, a transition from the 2nd to the 1st excited state will produce
A) a dark absorption line. B) an ultraviolet spectral line. C) no emission line. D) three different emission lines. E) the bright red Balmer alpha emission line.
A long steel beam has a length of twenty-eight meters on a cold day when the temperature is 0°C. What is the length of the beam on a hot day when T = 39°C? (?steel = 1.1 × 10^?5/C°)
a. 28.009 m b. 28.015 m c. 28.012 m d. 28.036 m e. 28.004 m
A quantity of mercury occupies 400.0 cm3 at 0°C. What volume will it occupy when heated to 50°C? Mercury has a volume expansion coefficient of 180 × 10-6 K-1
A) 450 cm3 B) 409.7 cm3 C) 403.6 cm3 D) 401.8 cm3
The number of electrons in a neutral atom is called its
A) principal quantum number. B) orbital quantum number. C) magnetic quantum number. D) atomic number. E) none of the above answers.