A 2-kg mass is hung from a spring (k = 18 N/m), displaced slightly from its equilibrium position, and released. What is the frequency of its vibration?
A) 1.5/? Hz
B) 1.5 ? Hz
C) 3.0/? Hz
D) 3.0 Hz
E) 1.5 Hz
A
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Which mission passed the bow shock in the Universe?
a. Cassini-Huygens b. Interstellar Boundary Explorer c. Voyager I d. Voyager II e. Kepler
A series circuit contains a 20-? resistor, a 200-mH inductor, a 10-?F capacitor, and an ac power source. At what frequency should the power source drive the circuit in order to have maximum power transferred from the driving source?
A) 0.11 kHz B) 0.45 kHz C) 0.96 kHz D) 0.17 kHz E) 0.28 kHz
__________is the spherical region of a spiral galaxy, containing a thin scattering of stars, star clusters, and small amounts of gas
A) A halo B) The central bulge C) The disk component D) A spiral tracer
Sirius A and Sirius B constitute a binary star pair in which the stars orbit their common center of mass with a period of 49.9 years. The stars are 2.40 × 1012 m apart
Assume that the two stars have equal masses and that they move in a circle about their common center of mass. What is the mass of each star? G = 6.67 x 10-11 N•m2/kg2. A) 5.41 × 1030 kg B) 2.70 × 1030 kg C) 7.55 × 1030 kg D) 3.30 × 1030 kg E) 1.65 × 1030 kg