Alone of all the Galilean moons, Callisto shows no sign of plate tectonics
Indicate whether the statement is true or false
FALSE
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Atmospheric air at 10°C enters a 2 m long smooth rectangular duct with a 7.5 cm x 15 cm cross-section. The mass flow rate of the air is 0.1 kg/s. If the sides are at 150°C, estimate (a) the heat transfer coefficient, (b) the air outlet temperature, (c) the rate of heat transfer, and (d) the pressure drop.
GIVEN
Atmospheric air flow through a rectangular duct
Inlet bulk temperature (Tb,in) = 10°C
Duct length (L) = 2 m
Cross-section = 7.5 cm x 15 cm = 0.075 m ? 0.15 m
Mass flow rate (m) = 0.1 kg/s
Duct surface temperature (Ts) = 150°C
FIND
(a) The heat transfer coefficient ch
(b) The air outlet temperature (Tb,out)
(c) The rate of heat transfer (q)
(d) The pressure drop (?p)
ASSUMPTIONS
Steady state
The duct is smooth
SKETCH
for dry air at the inlet bulk temperature of 20°C
Thermal conductivity (k) = 0.0251 W/(m K)
Absolute viscosity (?) = 18,240 × 10–6 (Ns)/m2
Prandtl number (Pr) = 0.71
Specific heat (c) = 1012 J/(kg K)
If you locate the north celestial pole in your local sky and measure its altitude, then you will know
A) your latitude and longitude. B) your latitude and the direction that is due north for you. C) your longitude and the direction that is due north for you. D) your latitude and the local time. E) your latitude, longitude, and local time.
Which statement must be true in order for a rocket to travel from Earth to another planet?
A) It must carry a lot of extra fuel. B) It must have very large engines. C) It must attain escape velocity from Earth. D) It must be launched from space, rather than from the ground.
Approximately how fast is an ion of helium moving if it is in a plasma with a temperature of 108 K? m(He) = 4.002 603 u and u = 1.66 × 10^?27 kg
a. 106 m/s b. 104 m/s c. 102 m/s d. 10 m/s e. 1 m/s