In the space shuttle, the areas exposed to the highest temperature are made of
(a) Graphite-fiber-reinforced carbon-carbon composite
(b) Silica tiles coated with silicon carbide
(c) Graphite-fiber-reinforced epoxy composite
(d) Alumina tiles
(a) Graphite-fiber-reinforced carbon-carbon composite
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Where would you least expect to find an ionization nebula?
A) in the galactic disk B) near a hot, young star C) in a spiral arm D) in the halo of our galaxy
Two point charges q1 = 4.0 ?C and q2 = -8.0 ?C are placed along the x-axis at x1 = 0 m and x2 = 0.20 m, respectively. What is the electric potential energy of this system of charges?
A) +1.4 J B) -1.4 J C) -32 J D) 4.0 J E) -4.0 J
A 7.8-kg solid sphere, made of metal whose density is 2500 kg/m3, is suspended by a cord. When the sphere is immersed in water (of density 1000 kg/m3 ), what is the tension in the cord?
A) 46 N B) 61 N C) 76 N D) 92 N E) 110 N
Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject electrons from that metal?
a. red c. infrared b. green d. ultraviolet