Water is flowing in a drainage channel of rectangular cross-section. The width of the channel is 15 m, the depth of water is 8.0 m and the speed of the flow is 2.5 m/s. What is the flow rate in kg/s?
A)
2.0 × 105 kg/s
B)
2.0 × 103 kg/s
C)
3.0 × 105 kg/s
D)
3.0 × 103 kg/s
E)
3.0 × 102 kg/s
C
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A 25 nH inductor is in an AC circuit whose generator has an rms voltage of 12 V. At what frequency must the generator drive the circuit if the rms current is to be 2.0 mA?
A. 0.15 MHz B. 38 GHz C. 0.96 MHz D. 240 GHz
A flat plate is in a solar orbit 150,000,000 km from the sun. It is always oriented normal to the rays of the sun and both sides of the plate have a finish which has a spectral absorptance of 0.95 at wavelengths shorter than 3 ?m and 0.06 at wavelengths longer than 3 ?m. Assuming that the sun is a 5550 K blackbody source with a diameter of 1,400,000 km, determine the equilibrium temperature of the plate.
GIVEN
• A flat plate in solar orbit oriented normal to the rays of the sun
• Distance from the sun (R) = 150,000,000 km = 1.5 × 1011 m
• Spectral absorplatace (??) of both sides ??1 = 0.95 for ?1 < 3 ?m ??2 = 0.06 for ?1 > 3 ?m
FIND
• The equilibrium temperature of the plate (Tp)
ASSUMPTIONS
• The sun is a black body at Ts = 5550 K
• Sun diameter (Ds) = 1,400,000 km = 1.4 × 109 m
SKETCH
The most striking "cloudmark" in Jupiter's atmosphere is the
A) Great Dark Spot. B) Cassini Division. C) Great Red Spot. D) Black Hole. E) Brown Dwarf.
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