How do isotopes of a given element differ?
a. They have different mass numbers.
b. They have different neutron numbers.
c. They have different atomic numbers.
d. They have different quantum numbers.
e. none of the above
a, b
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Water with a density of 1,000 
flows through a 2.00 cm diameter pipe with a velocity of 2.40 m/s. What is the volume flow rate?
A. 
B. 
C. 
D. 
E. 
A polarizer (with its preferred direction rotated 30° to the vertical) is placed in a beam of unpolarized light of intensity 1. After passing through the polarizer, the beam's intensity is
A) 0.25. B) 0.50. C) 0.63. D) 0.87. E) 0.75.
An object of mass m is held at a vertical height h from ground level. It is then released and falls under the influence of gravity. Which of the following statements is true in this situation? (Neglect air resistance.)
A) The total energy of the object is decreasing. B) The kinetic energy of the object is decreasing. C) The potential energy of the object is increasing. D) The total energy of the object is increasing. E) The potential energy of the object is decreasing and the kinetic energy is increasing.
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 24 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the opposite direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 0.82 mT b. 0.93 mT c. 0.70 mT d. 0.58 mT e. 0.40 mT