Characteristic x-rays are the result of
a. outer electron transitions.
b. inner electron transitions.
c. nuclear electron states.
d. buckytubes.
b
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A capacitor is connected to the terminals of a variable frequency oscillator. The peak voltage of the source in kept fixed while the frequency is increased. Which statement is true?
A. The rms current through the capacitor decreases. B. The rms current through the capacitor increases. C. The phase angle between the current and source voltage changes. D. The current becomes zero when the frequency is large enough.
Interstellar reddening and extinction are due to ________ in the interstellar medium
A) rogue planets B) dust C) hydrogen gas D) helium gas E) ice crystals
What is a unique geologic feature of Miranda?
a. faults b. ovoids c. lava flows d. sinuous rilles e. sulfur-based volcanoes
An aluminum tube (E 5 72 GPa) AB of circular cross section has a pinned support at the base and is pin-connected at the top to a horizontal beam supporting a load Q 5 600 kN. The outside diameter of the tube is 200 mm and the desired factor of safety with respect to Euler buckling is 3.0. The required thickness t of the tube is most nearly:
(A) 8 mm
(B) 10 mm
(C) 12 mm
(D) 14 mm
