Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms different isotopes of the same element?
A) Atom 1: nucleus with seven protons and eight neutrons, surrounded by seven electrons
Atom 2: nucleus with seven protons and seven neutrons, surrounded by seven electrons
B) Atom 1: nucleus with six protons and eight neutrons, surrounded by six electrons
Atom 2: nucleus with seven protons and eight neutrons, surrounded by seven electrons
C) Atom 1: nucleus with eight protons and eight neutrons, surrounded by eight electrons
Atom 2: nucleus with eight protons and eight neutrons, surrounded by seven electrons
D) Atom 1: nucleus with four protons and five neutrons, surrounded by four electrons
Atom 2: nucleus with five protons and five neutrons, surrounded by four electrons
A) Atom 1: nucleus with seven protons and eight neutrons, surrounded by seven electrons
Atom 2: nucleus with seven protons and seven neutrons, surrounded by seven electrons
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How can a large asteroid impact in one spot on Earth affect the climate of the entire Earth?
A) The impact releases greenhouse gases that immediately make Earth warmer. B) The impact blasts a hole through Earth's mantle, allowing hot metal from the core to rise up and heat the world. C) The impact blasts debris into Earth's atmosphere that blocks sunlight, making Earth's surface cooler. D) The impact tears a hole in Earth's atmosphere, allowing heat energy to escape and thereby cooling our planet.
Two velocity vectors are added: one of magnitude 2.0 m/s and one of magnitude 4.0 m/s. Not knowing the respective directions, we can say that the magnitude of the sum of the vectors will be
A. less than 2.0 m/s. B. between 6.0 m/s and 4.0 m/s. C. 2.0 m/s. D. 6.0 m/s. E. between 6.0 m/s and 2.0 m/s.
An ant crawls in a straight line at a constant speed of 0.24 m/s for a distance of 3.0 m, beginning in the corner of a square classroom. It then turns exactly 90 degrees to the right, and proceeds an additional 4.0 m with a constant speed of 0.44 m/s, reaching the other corner of the same wall from which it began. What was the average speed for the full trip from corner to corner?
A. 0.34 m/s B. 0.30 m/s C. 0.21 m/s D. 0.23 m/s E. 0.32 m/s
Why does Earth have so little carbon dioxide in its atmosphere compared to Venus?
A) Earth has just as much carbon dioxide as Venus, but most of it is locked up in carbonate rocks rather than being free in the atmosphere. B) Earth's volcanoes outgassed far less carbon dioxide than those on Venus. C) Earth once had a lot of carbon dioxide, but it was lost to space during the heavy bombardment early in our solar system's history. D) Chemical reactions turned Earth's carbon dioxide into nitrogen.