The mass of the black hole in the center of the galaxy has been determined by observing the motion of stars orbiting it
a. True
b. False
Indicate whether the statement is true or false
True
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Sonic Booms: The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?
A. 0.87 B. 1.2 C. 1.7 D. 2.0
The color of an opaque object is the same as the light that is
A) transmitted. B) absorbed. C) reflected. D) all of the above E) none of the above
The frequency of a generated electromagnetic wave matches the
A) field strength of the fields. B) energy of the fields. C) frequency of vibrating charges that produced it. D) frequency of domains in the magnetic part of the wave.
A sculptor strikes a piece of marble with a hammer. Find the speed of sound through the marble (in km/s). (The Young's modulus is 50 × 10^9 N/m2 and its density is 2.7 × 10^3 kg/m3.)
a. 5.1 b. 4.3 c. 3.5 d. 1.3 e. 1.8