Combining two sounds of equal intensity will give a sound level 3 dB higher than the sound level due to just one of them
a. True
b. False
Indicate whether the statement is true or false
True
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Graphical Interpretation of Work: The resultant force on an object over a 0.50-s time interval is plotted in the graph in the figure. How much work did this force do on the object during the 0.50-s interval?
A. -25 J B. 50 J C. 22 J D. 12.5 J E. 0 J
Consider the right-going wave and the possible left-going waves displayed in problem Q2T.3. For which of the choices will there be an instant where the combined wave is a rectangular wave as shown below? 
A. A B. B C. C D. D E. None of the above
Compound Microscope: In a compound microscope
A. both the objective and the eyepiece form real images. B. magnification is provided by the objective lens and not by the eyepiece. The eyepiece merely increases the resolution of the image viewed. C. magnification is provided by the objective and not by the eyepiece. The eyepiece merely increases the brightness of the image viewed. D. the magnification is m1 + M2, where m1 is the lateral magnification of the objective and M2 is the angular magnification of the eyepiece. E. the image of the objective serves as the object for the eyepiece.
A light board, 10 m long, is supported by two sawhorses, one at one edge of the board and a second at the midpoint. A 40-N weight is placed between the two sawhorses, 3.0 m from the edge and 2.0 m from the center
What forces are exerted by the sawhorses on the board?