Heat is applied to an ice-water mixture to melt some of the ice. In this process
a. work is done by the ice-water mixture.
b. the temperature increases.
c. the internal energy increases.
d. all of the above are correct.
c
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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)
Lenz's Law: A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held above the center of the coil with its south pole downward. The magnet is released from rest and falls toward the coil. As viewed from above, what is the direction of the current induced in the coil as the magnet approaches the coil?
A. counterclockwise B. clockwise C. No current is induced in the coil. D. An emf but no current is induced in the coil.
Microwave ovens work mainly by exciting molecules of the substance named ______________
Fill in the blank(s) with correct word
If the source moves away from you, and at the same time you run away from the source, the frequency you hear is the same as f
Indicate whether the statement is true or false