Joseph writes the numbers 100,000,000,000, 3,240,000,000, and 48,000,000,000 as 1011, 3.24 × 109, and 4.8 × 1010. In this case, Joseph has used _____ to express the numbers in a simple way
A) theoretical notation
B) the hexadecimal numeral system
C) the binary number system
D) scientific notation
D
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Some asteroids have peculiar orbits that do not obey Kepler's laws.
Answer the following statement true (T) or false (F)
Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1. 25 billion years
By measuring the amount of its decay product (argon-40 ) present in the rock, you conclude that there must have been 80 micrograms of potassium-40 when the rock solidified. How old is the rock? A) 1.25 billion years B) 2.5 billion years C) 3.75 billion years D) 5.0 billion years
After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations: Electrons moving upward feel a magnetic force in
the northwest direction. Electrons moving horizontally toward the north are pushed downward. Electrons moving horizontally toward the southeast are pushed upward. Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction? A) toward the east B) toward the northeast C) toward the southwest D) toward the southeast E) toward the west
Orthoclase and plagioclase are the two main types of
a. silica. b. feldspars. c. calcite. d. sulfides.