A possible means for making an airplane radar-invisible is to coat the plane with an antireflective polymer. If radar waves have a wavelength of 3.84 cm, and the index of refraction of the polymer is n = 1.6, how thick would the coating be if a 180° phase change occurs at both surfaces?
a. 24 mm
c. 32 mm
b. 7.5 mm
d. 6.0 mm
D
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A galaxy that has created a large number of young stars all at once is a(n) _______________ galaxy
Fill in the blank(s) with correct word
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
= [10 m, 30°] and 
= [25 m, 130°], what is the magnitude of the sum of these two vectors?
A. 20 m
B. 35 m
C. 15 m
D. 25 m
E. 50 m
A helicopter is flying horizontally with a speed of 444 m/s over a hill that slopes upward with a 2% grade (that is, the "rise" is 2% of the "run")
What is the component of the helicopter's velocity perpendicular to the sloping surface of the hill? A) 8.9 m/s B) 220 m/s C) 435 m/s D) 444 m/s
Reaction forces are given in terms of load variable P for the truss below. The force in member FD is:
(A) 1.47P
(B) 2.27P
(C) 22.27P
(D) 24.27P
