Which physical mechanism could explain the fact that the atmospheric concentration of CO2 varies slightly over the course of each year?
A) Major volcanic eruptions every decade or so place additional CO2 in the atmosphere.
B) Every few years, another huge coal-powered power plant opens up and produces more CO2.
C) Seasonal changes in plant growth produce a regular yearly variation in CO2 levels, with the Northern Hemisphere (with much more land area) causing almost all the variation.
C) Seasonal changes in plant growth produce a regular yearly variation in CO2 levels, with the Northern Hemisphere (with much more land area) causing almost all the variation.
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What evidence do we have that pulsars are neutron stars?
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Two transparent materials are in contact. The one on the left has a lower index of refraction than the one on the right (nL A. The transmitted wave is unaffected and the reflected wave in inverted.
B. The transmitted wave is inverted and the reflected wave in unaffected.
C. Both the transmitted and reflected waves are inverted.
D. Both the transmitted and reflected waves are unaffected.
The asymmetrical surface markings on some of Saturn's moons are probably due to:
A) all of the moons are located within the rings and they sweep up ring particles. B) the moons of Saturn are made primarily of ices. C) in most cases, the moons are tidally locked by Saturn's gravity into synchronous rotation. D) comet impacts become progressively harder as you get closer to Saturn. E) most of the moons show signs of ice volcanism driven by tidal interactions.
A spring with a force constant of 1.50 N/m is attached to a mass of 120 g. The system has a damping constant of 0.0180 Ns/m. How long does it take the amplitude of the oscillations to decrease from 10.0 mm to 5.00 mm?
A) 12.5 s B) 10.0 s C) 6.25 s D) 4.62 s E) 9.24 s