In what part of the H-R diagram are white dwarfs?
A. lower center
B. just above the Sun on the main sequence
C. upper right
D. upper left
E. lower right
Answer: A
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The Zeeman effect can be used to determine the _______ our Sun and other stars
a. rotation speed of b. mass of c. color of d. magnetic field on e. radial velocity toward or away from
The diagram below illustrates the radioactive decay of Potassium (40K), which has a half-life of 1.3 billion years. If a lunar rock is found that currently contains 5 grams of 40K, and it is determined that the sample contained 20 grams when it was formed, how old is the lunar rock?
a.
6.5 billion years
b.
19.5 billion years
c.
2.6 billion years
d.
3.9 billion years
e.
4.6 billion years
The inside surface of a 1-m-long vertical 5-cm-ID tube is maintained at 120°C. For saturated steam at 350 kPa condensing inside, estimate the average heat transfer coefficient and the condensation rate, assuming the steam velocity is small.
GIVEN
? Steam condensing inside a vertical tube
? Tube length (L) = 1 m
? Tube inside diameter (D) = 5 cm = 0.05 m
? Tube surface temperature (Ts) = 120°C
? Steam pressure (p) = 350 kPa
FIND
? The average heat transfer coefficient (hc)
ASSUMPTIONS
? Steady state
? The steam velocity is small
? Film condensation occurs
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 350 kPa
