What is the angular resolution of the eye at a wavelength of 500 nm for a pupil diameter of 2.8 mm?
A. 
B. 
C. 
D. 
E. 
B.
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A machine gun fires 60.0 gram bullets at 6 bullets a second. If the velocity of the bullets is 600 m/s, then the average force on the machine gun is
A. 67.0 N. B. 75.0 N. C. 94.0 N. D. 109 N. E. 216 N.
A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N object is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center
A second object, with a weight of 15 N, is placed on the supported end. What magnitude forces do the sawhorses exert on the board?
The region in which charged particles are trapped by our magnetic fields is the
A) Aurora. B) ozone layers. C) Van Allen radiation belt. D) exosphere. E) ionosphere.
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 12 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the same direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 1.1 mT b. 1.4 mT c. 1.7 mT d. 2.0 mT e. 0.2 mT