Seismic S-waves can travel through Earth's liquid outer core
Indicate whether the statement is true or false
FALSE
You might also like to view...
Sunspots
A) were most numerous during the Maunder Minimum. B) are always found close to the Sun's poles. C) are relatively constant in number every year. D) come in pairs, representing the north and south magnetic fields. E) travel over the surface of the Sun from pole to pole.
Carbon dioxide is largely responsible for the greenhouse effect of the atmosphere.
Answer the following statement(s) true (T) or false (F)
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 the log of the creep strain rate is plotted as a function of the log of the applied stress, the slope is equal to the _________of the applied stress.
Fill in the blank(s) with the appropriate word(s).