Which of the following objects does not produce a spectrum that is a close approximation to a thermal radiation spectrum?
A) a hot, transparent gas
B) a star
C) a filament in an ordinary (incandescent) light bulb
D) you
E) a planet
A) a hot, transparent gas
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Ptolemy's model of the universe
a. was heliocentric. b. included elliptical orbits. c. contained epicycles. d. was heliocentric, included elliptical orbits, and contained epicycles. e. None of the other choices are correct.
A vehicle undergoes acceleration when it
A) gains speed. B) loses speed. C) changes its direction. D) all of the above
A rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it. Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T,
the other two sides being perpendicular to the magnetic field. The magnitude of the torque on the loop is A) 0.0093 m?N. B) 0.025 m?N. C) 0.050 m?N. D) 0.0019 m?N. E) 0.038 m?N.
An ornament of mass 40.0 g is attached to a vertical ideal spring with a force constant (spring constant) of 20.0 N/m. The ornament is then lowered very slowly until the spring stops stretching. How much does the spring stretch?
A) 0.00200 m B) 0.0196 m C) 0.0816 m D) 0.800 m E) 0.200 m