Our present days of the week are related to the names of the Sun, the Moon, and ______________ planets
Fill in the blank(s) with correct word
five visible
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Which of the following are advantages offered by the thorium nuclear reactor?
A) operates at relatively low temperatures B) produces isotopes of short radioactive half-lives C) difficult to use for bomb making D) All of the above.
Harry places a new air conditioner in the middle of his hot room, which when operating
A) cools the room. B) further warms the room. C) neither of these
Repeat Problem 9.23 for a tier of six horizontal 2.5-cm-OD tubes under similar thermal conditions.
GIVEN
? Saturated steam condensing on horizontal tubes
? Tube outside diameter (D) = 2.5 cm = 0.025 m
? Tube outer surface temperature (Ts) = 27°C
? Steam pressure (p) = 12 kPa
? Number of tubes (n) = 6
FIND
? The average heat transfer coefficient (hc)
ASSUMPTIONS
? Steady state
? Film condensation occurs
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 12 kPa
A year is defined as:
A) the time it takes for Earth to complete a rotation on its axis. B) the time it takes for the Moon to complete an orbit of Earth. C) the time it takes for the Moon to complete a phase cycle. D) the time it takes for Earth to complete an orbit around the Sun. E) the time it takes for the Sun to complete an orbit around Earth.