A uniform charge density of 500 nC/m3 is distributed throughout a spherical volume (radius = 16 cm). Consider a cubical (4.0 cm along the edge) surface completely inside the sphere. Determine the electric flux through this surface.
A. 7.1 N ? m2/C
B. 3.6 N ? m2/C
C. 12 N ? m2/C
D. 19 N ? m2/C
E. 970 N ? m2/C
Answer: B
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A long steel beam with rectangular cross section of 40 cm by 60 cm is mounted on an insulating wall as shown in the following sketch. The rod is heated by radiant heaters that maintain the top and bottom surfaces at 300°C. A stream of air at 130°C cools the exposed face through a heat transfer coefficient of 20 W/(m2K). Using a node spacing of 1 cm, determine the temperature distribution in the rod and the rate of heat input to the rod. The thermal conductivity of the steel is 40 W/(m K).
GIVEN
Rectangular steel beam mounted on an insulating surface, heated top and bottom, with exposed face cooled by an air flow
FIND
(a) Temperature distribution in the rod (b) Rate of heat input to the rod
SKETCH
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a. 1, 99 b. 0, 100 c. 100, 0 d. 5, 95
A photocathode whose work function is 2.5 eV is illuminated with white light that has a continuous wavelength band from 360 nm to 700 nm. The stopping potential for this white light illumination is closest to:
A) 0.94 V B) 0.85 V C) 1.0 V D) 1.1 V E) 1.2 V