A wave with a long wavelength has a relatively
A) low frequency.
B) high frequency.
C) both of these
D) neither
Answer: A
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A heat exchanger wall consists of a copper plate 2 cm thick. The heat transfer coefficients on the two sides of the plate are 2700 and 7000 W/( m2 K), corresponding to fluid temperatures of 92 and 32°C, respectively. Assuming that the thermal conductivity of the wall is 375 W/ ( m K), (a) compute the surface temperatures in °C, and (b) calculate the heat flux in W/ m2.
GIVEN
• Heat exchanger wall, thickness (L) = 2 cm = 0.02 m
• Heat transfer coefficients
? hc1 = 2700 W/(m2 K)
? hc2 = 7000 W/(m2 K)
• Fluid temperatures
? Tf1 = 92°C
? Tf2 = 32°C
• Thermal conductivity of the wall (k) = 375 W/( m K) FIND (a) Surface temperatures (Tw1, Tw1) in °F (b) The heat flux (q/A) in W/m2. ASSUMPTIONS
• One dimensional heat transfer prevails
• The system has reached steady state
• Radiative heat transfer is negligible
SKETCH
The filament of a lightbulb glows, while the connecting wires do not. This is because
A) the wires are made of a type of material that cannot heat up. B) the resistance is larger in the lightbulb than in the wires. C) the current is larger in the lightbulb than in the wires. D) the resistance is smaller in the lightbulb than in the wires. E) the current is smaller in the lightbulb than in the wires.
Two hoops or rings (I = MR2) are centered, lying on a turntable. The smaller ring has radius = 0.05 m; the larger has radius = 0.10 m. Both have a mass of 5.0 kg. What is the total moment of inertia as the turntable spins? Ignore the mass of the turntable
a. 7.5E–1 kg·m2 b. 1.1E–1 kg·m2 c. 1.3E–2 kg·m2 d. 6.3E–2 kg·m2 e. 5.0E–2 kg·m2
Determine the change in entropy (in J/K) when 5.00 moles of an ideal gas at 0°C are compressed isothermally from an initial volume of 100 cm3 to a final volume of 20 cm3
a. ?191 b. ?52 c. ?71 d. ?67 e. ?208