The Search for Extraterrestrial Intelligence (SETI) program currently involves
A) broadcasting signals for other advanced civilizations to receive
B) listening for signals broadcast by advanced civilizations
C) searching for life on planets around other stars
D) searching for life in our solar system
B
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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
Two waves are described by ? y1 = 6 cos(180t?) and y2 = 6 cos(186t) (both in meters). ? What effective frequency does the resultant vibration have at a point?
A. 92 Hz B. 183 Hz C. 6 Hz D. 3 Hz E. 366 Hz
The major moons of ______________ were named after literary characters
a. Mars b. Jupiter c. Saturn d. Uranus e. Neptune
At t = 0 the switch S is closed with the capacitor uncharged. If C = 40 ?F, ? = 50 V, and R = 5.0 k?, how much energy is stored by the capacitor when I = 2.0 mA?
a.
20 mJ
b.
28 mJ
c.
32 mJ
d.
36 mJ
e.
40 mJ