Suppose you live at latitude 40°N. Which of the following describes the conditions that make a star circumpolar?
A) Stars are circumpolar if they have declination > +50°.
B) Stars are circumpolar if they have declination > +40°.
C) Stars are circumpolar if they have right ascension > 6 hr.
D) Stars are circumpolar if they have right ascension < 6 hr.
E) No stars are circumpolar at this latitude.
A
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A flat plate solar collector heats water by means of a 1 in diameter copper tube. At a certain time the inside surface of the copper tube is at 115ºF and the water enters at 50ºF. The water should be leaving the collector at 95ºF with a flow rate of 140 ft^3/hr. Determine (a) the Reynolds number and (b) the length of tube needed.
What will be an ideal response?
What is the moderator of a nuclear reactor?
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Two children start at one end of a street, the origin, run to the other end, then head back. On the way back Joan is ahead of Mike. Which statement is correct about the distances run and the displacements from the origin?
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