The local solar time at 75°W is 12:00 noon. What is the longitude of an observer who sees the full moon on her meridian at this time?
a. 105°E
b. 75°E
c. 15°E
d. 15°W
e. None of the above
a
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Identify a true statement about Venus
A) It is the largest planet in the Solar System. B) It is the least luminous object in the sky. C) It is more than 60 million miles away from the Sun. D) It generates its own energy by nuclear fusion.
Consider an object floating on a pool of water. Suppose much oil is poured onto the water and now floats above the water, with the object floating with part surrounded by a layer of oil and the lower part still in water
How has the buoyant force on the object changed by the oil layer? A) decreased B) remained the same C) increased
A long, 2-cm-diameter horizontal copper pipe carries dry saturated steam at 120 kPa absolute pressure. The pipe is contained within an environmental testing chamber in which the ambient air pressure can be adjusted from 50 kPa to 200 kPa absolute, while the ambient air temperature is held constant at 20°C. What is the effect of this pressure change on the rate of condensate flow per meter length of pipe? Assume that the pressure change does not affect the absolute viscosity, thermal conductivity, or specific heat of the air.
GIVEN
• A long horizontal copper pipe carrying saturated steam within an environmental testing chamber
• Outside diameter (D) = 2 cm = 0.02 m
• Steam pressure = 120 kPa
• Ambient pressure range (P) = 50 to 200 kPa
• Ambient air temperature (T?) = 20°C FIND
• Effect of ambient pressure change on rate of condensate flow per meter length of pipe
ASSUMPTIONS
• Pressure change has no effect on absolute viscosity, thermal conductivity, or specific heat of the air
• Air is still
• Chamber temperature is held constant while pressure is changed
• Convective thermal resistance on the inside of the pipe is negligible
• Thermal resistance of the copper pipe is negligible
• The air behaves as an ideal gas
SKETCH
PROPERTIES AND CONSTANTS
For saturated steam 0.12 MPa the heat of vaporization (hfg) = 2238 kJ/kg, and the temperature (Ts) = 105°C.
for dry air at the mean temperature of 62.5°C and one atmosphere
Thermal expansion coefficient (?) = 0.00298 1/K
Thermal conductivity (k) = 0.0281 W/(m K)
Absolute viscosity (?) = 20.02 × 10–6 (N s)/m2
Prandtl number (Pr) = 0.71
Density (?) = 1.018 kg/m3
For an ideal gas 12PP = 12
A composite beam of aluminum (Ea 5 72 GPa) and steel (Es 5 190 GPa) has a width b 5 25 mm and heights ha 5 42 mm and hs 5 68 mm, respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately:
(A) 86 MPa
(B) 90 MPa
(C) 94 MPa
(D) 98 MPa