What is the buoyant force on a 1.200 kg solid steel ball submerged in water? (density of steel is 7,900 
A. 1.136 N
B. 1.245 N
C. 1.489 N
D. 1.566 N
E. 1.750 N
C. 1.489 N
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Calculate the Nusselt number and the convection heat transfer coefficient for water at a bulk temperature of 32°C flowing at a velocity of 1.5 m/s through a 2.54-cm-ID duct with a wall temperature of 43°C. Use the Gnielinski correlation and two other correlations given in te text and cmpare the results.
GIVEN
• Water flowing through a duct
• Bulk water temperature (Tb) = 32°C
• Water velocity (V) = 1.5 m/s
• Inside diameter of duct (D) = 2.54 cm = 0.0254 m
• Duct wall surface temperature (Ts) = 43°C
FIND Use three different methods to find (a) The Nusselt number (NuD)
(b) The convective heat transfer coefficient (hc)
ASSUMPTIONS
• Steady state
• Fully developed, incompressible flow
SKETCH
PROPERTIES AND CONSTANTS
for water at a reference temperature equal to the bulk temperature (Tref = 32°C)
Thermal conductivity (k) = 0.619 W/(m K)
Kinematic viscosity (?) = 0.773 × 10–6 m2/s
Prandtl number (Prb) = 5.16
Absolute viscosity (?b) = 763 × 10–6 (Ns)/m2
Prandtl number at surface temperatue(Prs) = 4.06 At the surface temperature of 43°C:
Absolute viscosity (?s) = 626.3 × 10–6 (Ns)/m2
Soot has a clear warming effect
What will be an ideal response?
The brightest 100 stars viewed from Earth are mostly not on the main sequence (even though most stars are) because:
A. only high mass stars formed near us in the Galaxy. B. our region of the Galaxy is very young. C. the most luminous stars are giants and supergiants that have already finished their main sequence lifetimes. D. the main sequence is the shortest part of a star's life, so stars don't spend much time there. E. our region of the Galaxy is very old.
The atmosphere of Venus is very dry
a. True b. False Indicate whether the statement is true or false