On an H-R diagram, a red supergiant would be located in the
A) upper right.
B) upper left.
C) lower left.
D) lower right.
A) upper right.
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If a planet orbits the Sun at a distance of 4 AU, then its orbital period is 8 years
a. True b. False Indicate whether the statement is true or false
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4sin(5x)cos(6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves?
a. 3 Hz b. 1 Hz c. 6 Hz d. 12 Hz e. 5 Hz
Repeat Problem 9.26 part (b) and (c) but assume that condensation occurs on a 5 cm-OD horizontal tube.
GIVEN
? SO2 condensing on a horizontal tube
? Tube outside diameter (D) = 5 cm = 0.05 m
? Pressure (p) 490 kPa
? SO2 properties
FIND
(a) Condensate film thickness (S) at 1.3 cm from the bottom (x = L – 1.3 cm = 0.187 m)
(b) The average heat transfer coefficient (hc)
(c) The rate of condensation (m) in kg/h
ASSUMPTIONS
? Steady state
? Laminar condensate flow
? Vapor density is negligible compared to the liquid density
SKETCH
A group of 10 to 100 stars that formed at the same time but are so widely scattered in space their mutual gravity cannot hold them together is called
a. a globular cluster. b. an open cluster. c. an association. d. a spherical component e. an accretion disk.