A total of 2.0 × 1013 electrons pass a given point in a wire in 15 s. What is the current through the wire? (e = 1.60 × 10-19 C)
A) 1.3 mA
B) 1.3 A
C) 0.21 ?A
D) 3.2 ?A
C
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What will be an ideal response?
From where did the oxygen in the Earth's atmosphere originate?
A) photosynthesis from plant life and single-celled organisms B) atmospheric bombardment C) outgassing from volcanoes D) chemical reactions between gas in the upper atmosphere and the solar wind E) oxidation of surface rocks
The very earliest Greek cosmological theory, several centuries before Ptolemy, stated that
A) the planets revolve in loop-the-loops [circles within circles] around Earth. B) the entire universe is in reality just the inside of a giant cosmic frog. C) the planets go in simple circles around the sun. D) the planets go in simple circles around Earth. E) the planets revolve in loop-the-loops around the sun.
Our senses may obtain less-than-accurate information concerning our physical world because they
a. have limited sensitivity. b. have a limited range. c. are useless. d. can be deceived.