Which of the following describes the most convincing evidence in support of the idea that human activity is causing climate change on Earth?
A) Polls show that a majority of Americans agree that this is the case.
B) The vast majority of scientists say so.
C) The known science behind the greenhouse effect predicts that warming should be occurring as the carbon dioxide concentration rises, and the average temperature is rising as expected.
D) There is no other known process besides the burning of fossil fuels that can lead to any change in Earth's average temperature.
C) The known science behind the greenhouse effect predicts that warming should be occurring as the carbon dioxide concentration rises, and the average temperature is rising as expected.
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A planet has mass M = 8.00 × 10^23 kg. The centripetal acceleration of an orbiting space station is equal to the gravitational acceleration on Earth's surface. What is the speed of the space station? (G = 6.67 × 10^–11 m3·kg–1·s–2)
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Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane. Of the two, the planet that is farther from the star must have
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