You see a waxing crescent moon. You email your friend in New Zealand and ask her what moon phase she sees that night. She says
A) waxing crescent.
B) waning crescent.
C) waning gibbous.
D) waxing gibbous.
A) waxing crescent.
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A polyethylene bar (E 5 1.4 GPa, ? 5 0.4) of diameter 80 mm is inserted in a steel tube of inside diameter 80.2 mm and then compressed by axial force P. The gap between steel tube and polyethylene bar will close when compressive load P is approximately:
(A) 18 kN
(B) 25 kN
(C) 44 kN
(D) 60 kN
In chemistry, oxidation occurs when a substance
A) loses electrons B) rearranges its electrons internally C) accepts electrons D) breaks into its constituent atoms
The principle of Occam's Razor states that
A) scientific explanations may invoke supernatural causes if no other causes are found. B) only a model that has survived repeated observational tests deserves to be called a scientific theory. C) no scientific theory, no matter how well tested, can ever be proved absolutely true. D) in explaining natural phenomena, the simplest explanation consistent with the observations is to be preferred. E) while personal biases may influence individual scientists, the process of science itself can uncover these biases.
Explain as exactly as possible the way in which the central engine of active galaxies and quasars actually works. Why is the orientation so important?
What will be an ideal response?