In which type or types of radioactive decay does the mass number of the parent nucleus not change?
A) electron capture only
B) beta decay only
C) alpha decay only
D) beta decay and electron capture
D
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A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
a. 3.5 rad/s b. 3.8 rad/s c. 4.1 rad/s d. 2.0 rad/s e. 5.6 rad/s
A 4.00 kg mass is located at (2.00 m, 2.00 m, 0.00 m) and a 3.00 kg mass is located at (–1.0 m, 3.00 m, 0.00 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. 24 kg 
B. 36 kg
C. 43 kg
D. 56 kg
E. 62 kg
The speed of propagation of a transverse wave on a 2.0-m long string fixed at both ends is 200 m/s. Which one of the following is not a resonant frequency of this string?
A) 25 Hz B) 50 Hz C) 100 Hz D) 200 Hz
Rutherford's experiment, in which he fired alpha particles of 7.7 MeV kinetic energy at a thin gold foil, showed that nuclei were very much smaller than the size of an atom because
a. some alpha particles passed through the foil undeflected. b. some alpha particles were deflected backwards. c. some alpha particles were captured by the gold nuclei. d. the alpha particles could not get closer than 10-10 m to the gold nuclei. e. the alpha particles split into deuterium nuclei when they encountered the gold nuclei.