While Kuiper Belt bodies are often larger than any asteroid, we think their density will be lower due to presence of a lot of
A) hydrogen. B) methane. C) rock. D) ice. E) helium.
D
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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.
As an interstellar cloud of hydrogen gas shrinks in size, its rate of rotation
A) increases, because its total energy is conserved. B) decreases, because the force of gravity strengthens as the cloud shrinks. C) increases, because its angular momentum is conserved. D) decreases, because its angular momentum is conserved. E) increases, because the force of gravity strengthens as the cloud shrinks.
A magnetic field of 2.00 T is applied to a bubble chamber to make the tracks of protons and other charged particles identifiable by the radius of the circles they move in. If a high-energy proton moves along an arc of a 3.30-m circle, what is the momentum of the proton? [q = 1.60 × 10^?19 C, m = 1.67 × 10^?27 kg]
The period of an oscillating weight on a spring in an inertial frame of reference is 0.80 s. What would be its speed if it were to move by an observer who measures its period as 1.2 s? (c = 3.00 × 10^8 m/s)
a. 2.5 × l08 m/s c. 2.9 × 10^8 m/s b. 1.1 × l08 m/s d. 2.2 × 10^8 m/s