The intensity of the sound wave from an airplane is
at 5.0 m. What is the intensity at 100 m?
A. 0.25 
B. 0.53 
C. 5.0
D. 0.25 
A. 0.25
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A certain astronomical telescope has a diameter of 5.60 m. Considering only the limitation due to diffraction, what is the minimum angle of resolution for this telescope at a wavelength of 620 nm?
A) 0.111 µrad B) 0.311 µrad C) 0.270 µrad D) 0.135 µrad E) 0.405 µrad
Which of the following types of Universe has no center and no edge?
a. closed b. flat c. open d. All of the other choices are correct.
A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion
A) is zero. B) moves horizontally. C) moves vertically. D) moves along a parabolic path.
If a dense 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment?
a. 24.5 N b. 49.0 N c. 69.3 N d. 98.0 N e. 139 N