A sound source radiates sound uniformly in all directions. The intensity of the sound at a distance of 100 m is 
The power of the sound source is
A. 12.6 W.
B. 16.2 W.
C. 20.4 W.
D. 24.5 W.
E. 30.6 W.
A. 12.6 W.
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In order for a force to do no work on an object
A. All forces must do work. B. The object is stationary, or the force is perpendicular to the motion C. The force is perpendicular to the direction of motion D. The object is stationary
The figure shows a graph of the acceleration of an object as a function of the net force acting on it. The mass of this object, in grams, is closest to
A) 130. B) 11. C) 89. D) 8000.
Information-carrying nerves are connected to the retina at the
A) fovea. B) blind spot. C) cornea. D) iris. E) periphery.
A laser beam (l = 694 nm) is incident on two slits 0.100 mm apart. Approximately how far apart (in m) will the bright interference fringes be on the screen 5.00 m from the double slits?
a. 3.47 × 10^-3 b. 3.47 × 10^-2 c. 3.47 × 10^-4 d. 3.47 × 10^-6 e. 3.47 × 10^-5