A series RLC circuit in a radio is in resonance with AM 700 kHz. If the radio station is changed to AM 2100 kHz, by what factor must the capacitance be multiplied to again achieve resonance?
a. 9
b. 3
c. 1
d. 1/3
e. 1/9
e
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A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving upwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb b. 160 lb c. 170 lb d. none of the above
When a current flows through a metal wire, the moving charges are
A) only electrons. B) negative metal ions. C) only protons. D) positive metal ions. E) both protons and electrons.
Uniform Circular Motion: Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle with a radius of 600 m. At the bottom of the dive, the speed of the airplane is 150 m/s. What is the apparent weight of the 70-kg pilot at that point?
A. 3300 N B. 690 N C. 2600 N D. 490 N E. 1400 N
How is the energy that powers radio galaxies, quasars, and other active galactic nuclei produced?
A) by matter that has been converted to pure energy by interacting with the jets shot out by a central black hole B) by nuclear fusion near a central black hole C) by matter-antimatter annihilation near a central black hole D) by magnetic fields that trap and accelerate charged particles, which then radiate large amounts of energy E) by gravity, which converts the potential energy of matter falling toward a central black hole into kinetic energy, which is then converted to thermal energy by collisions among the particles of matter