Planes traveling between Seattle and Tokyo often go near Alaska because
A) there is less air traffic to contend with.
B) planes travel faster in cooler air.
C) the distance is shorter.
D) the plane can stay over the safety of land for longer.
C
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In an X-ray diffraction experiment using X-rays of ? = 0.500 × 10?10 m, a first-order maximum occurred at 5.00°. Find the crystal plane spacing.
A. 2.87 × 10?10 m B. 1.36 × 10?10 m C. 6.24 × 10?9 m D. 1.93 × 10?9 m E. 5.74 × 10?9 m
Which of the following statements is true of Jupiter's interior?
A) High pressure creates a sudden boundary between liquid and gas. B) It is four times colder than the Sun's surface. C) The rocky core at Jupiter's center contains light-weight elements. D) It is composed of a material that is a very good conductor of electricity.
A current of 5 A is flowing in a 20 mH inductor. The energy stored in the magnetic field of this inductor is
A) 1 J. B) 0.25 J. C) 0.50 J. D) 0. E) dependent upon the resistance of the inductor.
A small bomb, of mass 10. kg, is moving toward the North with a velocity of 5.0 m/s. It explodes into three fragments:
a 5.0 kg fragment moving West with a speed of 8.0 m/s; a 4.0 kg fragment moving East with a speed of 10. m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.) A) 40 m/s North B) 5.0 m/s South C) 50.m/s North D) zero E) 4.0 m/s North