What is the frequency of the wave?
A. 80 Hz
B. 50 Hz
C. 120 Hz
D. 140 Hz
E. 160 Hz
B. 50 Hz
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A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thickness of t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in aluminum to that in copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
A 25-kg piece of equipment can be hung by steel wires of length 1.00 m, 2.00 m, or 3.00 m. If all the wires have the same diameter, which one will stretch the greatest percent?
A) the 3.00-m wire B) the 1.00-m wire C) the 2.00-m wire D) They will all stretch by the same percent.
Radioactivity Basics: The isotope 
U is radioactive and decays in a series to 
Th. In this series, the particles ejected from the nucleus are
A. one alpha particle and three beta-minus particles. B. three alpha particles and one beta-minus particle. C. one alpha particle and four beta-minus particles. D. four alpha particle and one beta-minus particle. E. two alpha particles and two beta-minus particles.
An electron (m = 9.11 × 10?31 kg) has a speed of 0.50c. Determine the difference between its relativistic kinetic energy and the kinetic energy calculated without considering relativity.
A. 3.0 × 10?15 J B. 2.0 × 10?15 J C. 1.5 × 10?15 J D. 2.4 × 10?15 J E. 1.8 × 10?15 J