Light of 10 cm wavelength is classified as what type of radiation?
A. 
ray
B. x-ray
C. UV
D. microwave
E. visible
D. microwave
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Electric Field of Point-Charges: Three equal positive point charges +q are placed at the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
A. A B. B C. C D. D
An aluminum cantilever beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is sub- jected to uniform load q 5 1.5 kN/m. The allowable bending stress is 55 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 20 mm
(C) 30 mm
(D) 40 mm
What is a white dwarf?
A) a star that follows a period-luminosity relation B) a type of star that produces energy by gravitational contraction C) a main-sequence star of spectral type F, which tends to look white in color D) the remains of a star that ran out of fuel for nuclear fusion
A voltage regulator compensates for changes in
a. temperature. b. the load conditions. c. the input voltage. d. All of the above.