Water is flowing through a pipe with a constriction. The area of the narrow section is one-half the area of the wide section. If the velocity of the incompressible fluid is 3.2 m/s in the narrow section, then what is the velocity of the fluid in the wide section?
A. 0.9 m/s
B. 1.0 m/s
C. 1.6 m/s
D. 1.8 m/s
E. 1.9 m/s
C. 1.6 m/s
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One section of a pipe carrying water has a cross-sectional area of 16 cm2; in this section the water has flow velocity of 1.0 m/s. Another section of this pipe has a constricted cross-sectional area of 4 cm2. If the flow is steady, what is the water velocity in the constricted section?
A. 4.0 m/s B. 0.50 m/s C. 1.0 m/s D. 2.0 m/s E. 0.25 m/s
The filament in a light bulb has a diameter of 0.050 mm and an emissivity e = 1.0
The temperature of the filament is 3000°C. How long should the filament be in order to radiate 60 W of power? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4). A) 11 cm B) 9.4 cm C) 8.6 cm D) 7.2 cm E) 5.9 cm
A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick
The room temperature is maintained at -10°C and the outside temperature is 20°C The inside wall is to be covered by a layer of wood in order to reduce the rate of heat loss through the wall BY 90 percent. The thermal conductivities of concrete and wood are 0.80 W/m ? K and 0.040 W/m ? K, respectively. Under steady state conditions, the thickness of the layer of wood required is closest to A) 60 mm. B) 70 mm. C) 80 mm. D) 90 mm. E) 100 mm.
Two glass slides are separated by a thin layer of plastic. The glass has an index of refraction nglass and the plastic has an index nplastic. The two indices are not equal. If nplastic = 1.50, for what minimum non-zero thickness of plastic will the transmitted light be for a beam of wavelength 600 nm?
1.400 nm 2.200 nm 3.100 nm 4.One needs to know which of the indices is the greater to solve this.