Success in science is mainly linked to emphasis on
A) experiments.
B) luck.
C) trial and error.
D) philosophical discussions.
Answer: A
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Experimental measurements of the temperature distribution during the flow of air at atmospheric pressure over the wing of an airplane indicate that the temperature distribution near the surface can be approximated by a linear equation
where a = a constant = 2 m–1
Ts = surface temperature, K
T? = free stream temperature, K
y = perpendicular distance from surface (mm)
(a) Estimate the convective heat transfer coefficient if
Ts = 50°C and T?= – 50°C.
(b) Calculate the heat flux in W/m2
GIVEN
Air flow over an airplane wing
Temperature distribution is given by the expression above
Surface temperature (Ts) = 50°C
Ambient temperature (T?) = – 50°C
FIND
(a) The convective heat transfer coefficient
ch
(b) The heat flux (q/A) in W/m2
ASSUMPTIONS
Steady state conditions
Uniform surface temperature
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for air at 0°C, the thermal conductivity (k) = 0.0237 W/(m K)
Which of the following is not a possible energy source for a steam-electric generating plant?
A) fossil fuels B) wood C) solar energy D) fissionable material such as uranium E) All of the above are possible energy sources.
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A long cylindrical shell (radius = 2.0 cm) has a charge uniformly distributed on its surface. If the magnitude of the electric field at a point 8.0 cm radially outward from the axis of the shell is 85 N/C, how much charge is distributed on a 2.0-m length of the charged cylindrical surface?
a. 0.38 nC b. 0.76 nC c. 0.19 nC d. 0.57 nC e. 0.98 nC