A man is rotating on a frictionless platform at
a constant angular velocity when he
suddenly extends his arms away from his
sides. His speed of rotation will immediately
slow down because
a)his weight changes.
b)his angular momentum must be conserved.
c)am impulse has been applied.
d)his angular velocity increases.
b
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Replot the data points of Figure 5.9(b) on log-log paper and find an equation approximating the best correlation line. Compare your results with Figure 5.10. Then, suppose that steam at 1 atm and 100°C is flowing across a 5-cm-OD pipe at a velocity of 1 m/s. Using the data in Figure 5.10, estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at 200°C and compare with predictions from your correlation equation.
GIVEN
Figure 5.9(b) in text
Steam flowing across a pipe
Steam pressure = 1 atm
Steam temperature (Ts) = 100°C
Pipe outside diameter (D) = 5 cm = 0.05 m
Steam velocity (U?) = 1 m/s
Pipe temperature (Tp) = 200°C
FIND
(a) Replot Figure 5.9(b) on log-log paper and find an equation approximating the best correlation line
(b) Find the Nusselt number (Nu), the heat transfer coefficient (hc), and the rate of heat transfer per
unit length (q/L) using Figure 5.10
(c) Compare results with your correlated equation
ASSUMPTIONS
Steady state
Radiative heat transfer is negligible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 35, for steam at 1 atm and 100°C
The mass density of pure water is 
If the molecular mass of water is 18.0 u, how many water molecules are in spherical water balloon of radius 1.0 cm?
A. 
B. 
C. 
D. 
How was Pluto's surface mapped?
A) by mapping with the New Horizons spacecraft B) by measuring the change in brightness as Charon eclipsed Pluto C) by imaging with the Hubble Space Telescope D) by imaging with powerful ground based telescopes E) Pluto is too far away for its surface to be mapped.
When it is summer in Australia, the season in the United States is
A. winter B. summer C. spring