A +4.0-?C charge is placed on the x axis at x = +3.0 m, and a ?2.0-?C charge is located on the y axis at y = ?1.0 m. Point A is on the y axis at y = +4.0 m. Determine the electric potential at point A (relative to zero at the origin)
a. 6.0 kV
b. 8.4 kV
c. 9.6 kV
d. 4.8 kV
e. 3.6 kV
c
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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
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