The public debate about Martian canals was not resolved until
A) many scientists were unable to reproduce Percival Lowell's sketches of Martian canals
B) the governing body of astronomy, the International Astronomical Union made an official statement on the matter
C) the first spacecraft flew past Mars in 1965
D) the first spacecraft landed on Mars in 1976
C
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Resistance and Resistivity: The resistivity of the material of a wire is 1.76 × 10-8 ? ? m. If the diameter of the wire is 2.00 mm and its length is 2.00 m, what is its resistance?
A. 112 ? B. 11.2 ? C. 1.12 ? D. 0.112 ? E. 0.0112 ?
A certain brand of hot dog cooker applies a potential difference (120 V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog, what current is needed to cook four hot dogs simultaneously in 3.0 min?
a. 11 A b. 2.8 A c. 8.3 A d. 2.1 A e. 3.6 A
The national debt is measured in trillions of dollars. Which of the following is a representation of a trillion?
A) 1 × 1015 B) 1 × 1012 C) 1 × 109 D) 1 × 106 E) 1 × 103
Granulation is caused by
a. sunspots. b. rising and sink gases below the photosphere. c. shock waves in the corona. d. the solar wind flowing away from the corona. e. the heating in the chromosphere.