Earth's inner core is

a. liquid.
b. part solid and part liquid.
c. solid.
d. molten.


c

Physics & Space Science

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Helium condenses into the liquid phase at approximately 4 K. What temperature, in degrees Fahrenheit, does this correspond to?

A. ?182 B. ?269 C. ?118 D. ?452 E. ?484

Physics & Space Science

A horizontal 2.5-cm-OD tube is maintained at a temperature of 27°C on its outer surface. Calculate the average heat transfer coefficient if saturated steam at 12 kPa is condensing on this tube.

GIVEN
? Saturated steam condensing on a horizontal tube
? Tube outside diameter (D) = 2.5 cm = 0.025 m
? Tube outer surface temperature (Ts) = 27°C
? Steam pressure (p) = 12 kPa
FIND
? The average heat transfer coefficient (hc)
ASSUMPTIONS
? Steady state
? Film condensation occurs
SKETCH

PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 12 kPa

Physics & Space Science

Which surface feature of the Moon is NOT found on Mercury?

A. craters B. rays C. maria D. mountains

Physics & Space Science

Every second at Niagara Falls, some 5000 m3 of water falls a distance of 50 m. What is the increase in entropy per second due to the falling water? (Assume a 20°C environment)

Physics & Space Science