A uranium nucleus (mass 238 units) at rest decays into a helium nucleus (mass 4.0 units) and a thorium nucleus (mass 234 units). If the speed of the helium nucleus is 5.5 × 10^5 m/s, what is the speed of the thorium nucleus?
a. 9.4E+3 m/s
b. 3.2E+7 m/s
c. 3.4E+3 m/s
d. 9.4E+7 m/s
e. 1.9E–1 m/s
a
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At the center of the Sun, nuclear fusion converts hydrogen into
A) radiation and elements such as carbon and nitrogen. B) helium, gamma rays, and neutrinos. C) hydrogen compounds such as methane. D) radioactive elements such as uranium and plutonium. E) molecular hydrogen.
A baseball is thrown and lands 120 m away. While the ball is in flight, assuming the effect of air friction is negligible, which of the following is true?
a. At maximum height the ball has its greatest kinetic energy. b. The horizontal component of the baseball's kinetic energy is constant. c. The vertical component of the baseball's kinetic energy is constant. d. The mechanical energy of the baseball is greater when nearer to the ground. e. No answer above is correct.
Which of the following is not used as a distance indicator for galaxies?
a. Large globular clusters b. Herbig-Haro objects c. H II regions d. Cepheid variable stars e. Supernovae
A 6.00 kg mass is located at (2.00 m, 2.00 m, 2.00 m) and a 5.00 kg mass is located at (–1.0 m, 3.00 m,–2.00 m). If this system of masses rotated about the X-axis perpendicular to the Z-Y plane, then the moment of inertia of this system is
A. 281 kg 
B. 167 kg
C. 113 kg
D. 85 kg
E. 69 kg