Analysis of volcanic emissions suggests that eruptions could be the source of all but which of the following gases in our atmosphere?

A. nitrogen
B. carbon dioxide
C. water
D. oxygen


Answer: D

Physics & Space Science

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Indicate whether the statement is true or false

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A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at an angle of 40.0° above horizontal

The rock is thrown from a height of 2.00 m above the ground with a speed of 30.0 m/s and experiences no appreciable air resistance. If the rock strikes the window on its upward trajectory, from what horizontal distance from the window was it released? A) 53.2 m B) 48.7 m C) 71.6 m D) 29.8 m E) 27.3 m

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Which of the following forms of energy is the greatest for a system of a comet in orbit about the Sun during perihelion (the comet's closest approach to the Sun)

1.the total mechanical energy 2.the potential energy 3.the kinetic energy 4.none of these

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If the voltage between the plates of a parallel-plate capacitor is doubled, the capacitance of the capacitor

A) is tripled. B) is halved. C) is doubled. D) quadruples. E) remains the same.

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