A series circuit consists of a 1.02 V source of emf, a 2.00 mF capacitor, a 1000 
resistor, and a switch. When the switch is closed, how long does it take for the current to reach one-half its maximum value?
A. 0.693 s
B. 1.39 s
C. 2.00 s
D. 1.69 s
E. 0.0250 s
B. 1.39 s
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A sound wave in brass has a displacement amplitude of 3.00 mm. The frequency of the sound wave 750 Hz and the velocity is 2,813 m/s. If the density of brass is 
then what is the pressure amplitude of the sound wave?
A. 
B. 
C. 
D. 
E. 
In order to get a magnified image of an object, it's distance from a converging lens should be
A. A converging lens can't produce a magnified image B. At the focal length C. Smaller than the focal length D. There is not enough information here to answer the question.
Solar-type stars in our galaxy are
A) very common, making up about 50% of the total B) very rare (less than 1%) C) fairly common (several percent) D) the most common type of stars in our galaxy (75% or more)
The ideal shape for the primary mirror of a telescope is
a. concave circular b. convex circular c. concave parabolic d. convex parabolic e. plane