A charge of 18 nC is uniformly distributed along the y axis from y = 3 m to y = 5 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point x = +2 m on the x axis?
A.
B.
C.
D.
E.
Answer: A
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How should the control volume method be implemented at an interface between two materials with different thermal conductivities? Illustrate with a steady, one-dimensional example. Neglect contact resistance.
GIVEN
Interface between two different materials with different thermal conductivities
FIND
(a) Difference equation at the interface
ASSUMPTIONS
No heat generation
SKETCH
If we can solve the orbital motion of an eclipsing binary, we can find
a. the mass of each star. b. the diameter of each star. c. the distance to the binary. d. all of the other choices. e. the mass of each star and the diameter of each star.
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The frequency of a microwave absorbed by a molecule when changing from the J = 3 to J = 4 rotation energy state is 4.61 × 10^11 Hz. The moment of inertia of the molecule (in kg ? m2) is
a. 5.70 × 10^?45 b. 1.45 × 10^?46 c. 1.12 × 10^?44 d. 2.91 × 10^?46 e. 9.11 × 10^?46