The fast rotation of neutron stars is a consequence of the law of conservation of angular momentum.
Answer the following statement true (T) or false (F)
True
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The Hubble time is
a. the time it takes a galaxy moving at 1000 km/s to move 1 Mpc. b. the time it takes the galaxy to double its size. c. the time since recombination occurred. d. the time remaining before the Universe stops expanding and begins to contract. e. an estimate of the age of the Universe based on the Hubble constant.
The Petrified National Forest is found in the state of ______________
Fill in the blank(s) with correct word
Which of the following is not an arrangement of atoms or molecules on the mers of a LCM?
(a) Isotactic (b) Syndiotactic (c) Atactic (d) Polytactic
Calculate the heat transfer coefficient for film boiling of water on a 1.3 cm horizontal tube if the tube temperature is 550°C and the system is placed under pressure of 50 kPa.
GIVEN
? Film boiling of water on a horizontal tube
? Tube outside diameter (D) = 1.3 cm = 0.013 m
? Tube temperature (Tt) = 550°C
? Pressure = 50 kPa = 50,000 N/m2
FIND
? The heat transfer coefficient (hc)
ASSUMPTIONS
? Steady state
? Tube temperature is uniform and constant
? The viscosity, specific heat, and thermal conductivity of the vapor can be approximated by those
of steam at 1 atm pressure
? Radiation across the vapor film is negligible
SKETCH
PROPERTIES AND CONSTANTS
Extrapolating from Appendix 2, Table 35, for steam at 1 atm and 81.5°C
