Two capacitors with capacitances of 1.0 mC and 0.50 mF, respectively, are connected in series. The system is connected to a 150 V battery. What charge accumulates on the 1.0-mF capacitor?
a. 50 mC
c. 100 mC
b. 150 mC
d. 33 mC
A
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U-235 and Pu-239 are both
A) radioactive isotopes. B) fissionable isotopes. C) heavier than lead. D) all of the above E) none of the above
In a common dc circuit, electrons typically move at the speed of
A) a fraction of a centimeter per second. B) a few meters per second. C) sound. D) light. E) none of the above
Ellen says that whenever the acceleration is directly proportional to the displacement of an object from its equilibrium position, the motion of the object is simple harmonic motion. Mary says this is true only if the acceleration is opposite in direction to the displacement. Which one, if either, is correct?
a. Ellen, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. b. Ellen, because ?2 is directly proportional to the mass. c. Mary, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. d. Mary, because ?2 is directly proportional to the mass. e. Mary, because the second derivative of an oscillatory function like sin(?t) or cos(?t) is always proportional to the negative of the original function.
The blue light from the sky has been polarized by:
a. selective absorption. b. reflection. c. double refraction. d. scattering.