The speed of light in a certain medium is 2.2 × 108 m/s. What is the index of refraction of this medium?
A) 1.0
B) 1.2
C) 1.4
D) 1.6
E) 1.8
C
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What is the equivalent resistance between points a and b?
A. 14 ? B. 8.0 ? C. 6.0 ? D. 25 ? E. 40 ?
Chemical sedimentary rocks are formed from
A) biochemical interactions. B) carbonization. C) the precipitation of minerals from a water solution. D) evaporites.
A beam of 1012 neutrons/second is incident on an aluminum foil of thickness 10-4 m. The cross section for absorption is 0.23 bn. What is the reaction rate for neutrons being absorbed?
A) 1.4 × 1011/s B) 1.4 × 109/s C) 1.4 × 108/s D) 1.4 × 1010/s E) 1.4 × 1012/s
A boy throws a ball with an initial velocity of 25 m/s at an angle of 30° above the horizontal. How high above the projection point is the ball after 2.0 s?
A) 5.4 m B) 13 m C) 25 m D) 43 m E) 50 m