Most likely, oxygen was first released into the atmosphere by
A) the decomposition of dead organisms
B) plants
C) cyanobacteria
D) oxidation reactions
C
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Which of the following statements about the moons of the jovian planets is not true?
A) Some of the moons are big enough that we'd call them planets (or dwarf planets) if they orbited the Sun. B) One of the moons has a thick atmosphere. C) Many of the moons are made largely of ices. D) Most of the moons are large enough to be spherical in shape, but a few have the more potato-like shapes of asteroids.
The electric field at a point 2.8 cm from a small object points toward the object with a strength of 180,000 N/C. What is the object's charge q? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
A) -16 nC B) +16 nC C) -17 nC D) +17 nC
Calculate the linear speed due to the Earth's rotation for a person at 40° north latitude on the Earth. The radius of the Earth is 6.40 × 10^6 m
a. 74.0 m/s c. 465 m/s b. 356 m/s d. 73.0 m/s
When Cavendish claimed that he "weighed" Earth, he actually calculated the
A. force that the Moon exerts on Earth. B. weight of Earth. C. mass of Earth. D. force that the Sun exerts on Earth.