Two masses are connected by a string which passes over pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is
A. 2.98 
B. 3.92
C. 5.75
D. 6.86
E. 7.84
D. 6.86
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Radioactive Decay: The decay constant of a radioactive nuclide is 4.6 × 10-3 s-1. What is the half-life of this isotope, in minutes?
A. 2.5 min B. 3.6 min C. 3.1 min D. 1.4 min E. 2.0 min
The concept of pressure involves both
A) force and volume. B) force and area. C) area and volume.
The wave function for a particle must be normalizable because
A) the particle's momentum must be conserved. B) the particle's angular momentum must be conserved. C) the particle's charge must be conserved. D) the particle must be somewhere. E) the particle cannot be in two places at the same time.
When light travels from air into water,
A) its velocity, wavelength and frequency all change. B) its velocity changes, but its frequency and wavelength do not change. C) its frequency changes, but its velocity and wavelength do not change. D) its velocity and wavelength change, but its frequency does not change. E) its wavelength changes, but its velocity and frequency do not change.