Mountains characterized by folded rock strata are known as ______________ mountains
Fill in the blank(s) with correct word
fold
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What makes stars twinkle?
a. Variations of light output from the distant stars. b. Reflection by moving water. c. Being close enough to Earth to appear as tiny discs rather than points of light. d. The air near the surface of the earth is warmer than the air at the top of the atmosphere. e. Constant tiny changes in refraction as air molecules move.
Semiconductors: An n-type semiconductor is produced by
A. doping the host crystal with donor impurities. B. doping the host crystal with acceptor impurities. C. pure crystals of germanium.
Gravitational Potential Energy: An 825-kg space vehicle is circling Earth in a circular orbit with a radius of 10,300 km. Its orbit is to be changed to a larger circle with a radius of 17,400 km. How much energy is required to accomplish this? The mass of Earth is 5.97 × 1024 kg and G = 6.67 × 10-11 N ? m2/kg2.
A. 1.00 × 109 J B. 1.30 × 1010 J C. 6.51 × 109 J D. 4.45 × 109 J E. 4.50 × 1010 J
A wire has a strain of 0.10%. If the wire has an un-stretched length of 5.00 m, then the change in length of the wire is
A. 5.0 mm. B. 7.0 mm. C. 9.0 mm. D. 10 mm. E. 15 mm.