Stars that are visible in the local sky on any clear night of the year, at any time of the night, are called
A) bright.
B) seasonal.
C) circumpolar.
D) celestial.
C
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We live in the epoch called the
a. Quaternary. b. Ordovician. c. Holocene. d. Cenozoic.
A steel pipe column (E 5 210 GPa) with length L 5 4.25 m is constructed of circular tubing with outside diameter d2 5 90 mm and inner diameter d1 5 64 mm. The pipe column is fixed at the base and pinned at the top and may buckle in any direction. The Euler buckling load of the column is most nearly:
(A) 303 kN
(B) 560 kN
(C) 690 kN
(D) 720 kN
The melting point of aluminum is 660°C, the latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900 J/(kg K). How much heat must be added to 500 g of aluminum at 27°C to completely melt it?
A) 485 kJ B) 395 kJ C) 273 kJ D) 147 kJ E) 14 kJ
If the Moon is suddenly and inexplicably moved to four times its current distance from Earth, its orbital speed ________.
A. increases by a factor of 2 B. decreases by a factor of 4 C. increases by a factor of 4 D. decreases by a factor of 2 E. is unchanged due to its low mass