Characteristics of Waves: What is the frequency of the wave shown in the figure?
A. 0.5 Hz.
B. 1 Hz.
C. 2 Hz.
D. 4 Hz.
E. It cannot be determined from the given information.
Answer: A
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Solve the set of difference equations derived in Problem 4.52 given the following values of the problem parameters
k = 40.0 W/(mK), disk thermal conductivity a = 1 ? 10–5 m2/s, disk thermal diffusivity Rs = 25 mm, disk radius Zs = 5 mm, disk thickness q" max = 3 x 106 W/m2, peak absorbed flux Ro = 50 mm, parameter in flux distribution Tinit = 20°C, disk initial temperature Determine the temperature distribution in the disk when the maximum temperature is 300°C. GIVEN - Difference equations developed in Problem 4.52 given the following values of the problem parameters FIND (a) Disk temperature distribution when the maximum temperature is 300°C
The__________is a theory that proposed to account for spiral arms as compressions of the interstellar medium in the disk of the galaxy
A) spiral relativity theory B) spiral density wave theory C) spiral tracer theory D) spiral arm theory
PMMA is used as a substitute for _________where fracture resistance is required.
Fill in the blank(s) with the appropriate word(s).
A black sphere (2.5-cm in diameter) is placed in a large infrared heating oven whose walls are maintained at 370°C. The temperature of the air in the oven is 90°C and the heat-transfer coefficient for convection between the surface of the sphere and the air is 30 W/(m2 K). Estimate the net rate of heat flow to the sphere when its surface temperature is 35°C.
GIVEN
• A black sphere in a large infrared heating oven
• Sphere diameter (D) = 2.5 cm = 0.025 m
• Oven wall temperature (T2) = 370°C = 643 K
• Oven air temperature (T?) = 90°C = 363 K
• Convective heat transfer coefficient (hc) = 30 W/(m2 K)
• Sphere surface temperature (T1) = 35°C = 308 K
FIND
• The net rate of heat flow to the sphere (qtotal)
ASSUMPTIONS
• The oven walls are diffuse
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/m2K4