Current estimates place the age of the universe at about
A) 10 billion years.
B) 10 million years.
C) 14 billion years.
D) 4 billion years.
C
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Superconducting electromagnets
A) account for cases of magnetic levitation. B) are characterized by easy penetration of external magnetic fields. C) both of these D) none of the above
Kinetic energy is conserved in
a. an inelastic collision. b. an elastic collision. c. any collision where two objects rebound off each other. d. none of the above.
The parts of Saturn's rings with the greatest rotational speed are the
A) inner parts. B) outer parts. C) Neither, for all parts of Saturn's rings rotate equally.
A certain coin has a diameter of 21.21 mm, a thickness of 1.95 mm, and weighs 0.04905 N. What is its density?
A) 29.1 × 103 kg/m3 B) 7.26 × 103 kg/m3 C) 9.25 × 103 kg/m3 D) 2.31 × 103 kg/m3 E) 71.2 × 103 kg/m3