Which of the following statements about the Moon is not true?
A) The Moon goes through its cycle of phases in about a month.
B) The Moon's orbit around Earth is tilted about 5° to the ecliptic plane.
C) The Moon's distance from Earth varies during its orbit.
D) The Moon is visible in our sky only at night.
E) The Moon rotates once in the same amount of time that it takes to orbit around Earth.
D) The Moon is visible in our sky only at night.
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What is the Hubble constant essentially a measure of?
a. the number of galaxies in the universe b. the expansion of the universe c. the age of the Milky Way galaxy d. the amount of dark matter in an average galaxy
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
The temperature scale where the numerical value is proportional to the average kinetic energy of the atoms or molecules is __________
Fill in the blank(s) with correct word
The mass-luminosity relation applies to both white dwarfs and main-sequence stars as both trace linear lines on the H-R diagram
a. True b. False Indicate whether the statement is true or false