The spherical gaussian surfaces shown below surround the same total charge 
Through which sphere is the total electric flux larger?
A. The smaller sphere.
B. The larger sphere.
C. The flux through both spheres is the same.
D. One cannot determine the relative fluxes from the information that we are given.
C. The flux through both spheres is the same.
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Two 1.5 m-square and parallel flat plates are 30 cm apart. Plate A1 is maintained at a temperature of 1100 K and A2 at 500 K. The emissivities of the plates are 0.5 and 0.8, respectively. Considering the surroundings black at 0 K and including multiple inter-reflections, determine (a) the net radiant exchange between the plates and (b) the heat input required by surface A1 to maintain its temperature. The outer-facing surfaces of the plates are adiabatic.
GIVEN
? Two square parallel flat plates, 30 cm apart
? Temperature of A1 (T1) = 1100 K
? Temperature of A2 (T2) = 500 K
? Emittances: ?1 = 0.5 ?2 = 0.8
? Surroundings are black at (T3) = 0 K
FIND
Including multiple inter-reflections, determine:
(a) The net radiant exchange (q1–2)
(b) The heat input at surface A1 (q1) required to maintain its temperature
SKETCH
PROPERTIES AND CONSTANTS
The specific heat
A negatively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomes
A) positively charged. B) negatively charged. C) partially discharged. D) completely discharged. E) none of the above
While standing at a crosswalk, you hear a frequency of 600 Hz from an approaching police car. After the police car passes, its frequency is 400 Hz. What is the speed of the police car? (speed of sound = 340 m/s)
a. 34.0 m/s b. 60.0 m/s c. 66.3 m/s d. 68.0 m/s e. 199 m/s