As a one-solar-mass star evolves off the main sequence, it will probably undergo a _____
a. nova burnout
b. helium flash
c. hydrogen flash
d. helium bang
e. carbon flash
b
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Which of the following are relatively unchanged fragments from the early period of planet building in the solar system?
A) the moons of Mars B) asteroids C) Kuiper belt comets D) Oort cloud comets E) all of the above
The ultimate speed of a solar-sail-propelled spacecraft is limited by the
A) low energy photons that the Sun produces B) gravitational force of the Sun C) fact that the intensity of sunlight falls off rapidly with distance D) mass of the spacecraft
For very small objects at very low speeds, the drag force is directly proportional to the magnitude of the velocity. The proportionality constant depends on
A) the viscosity of the fluid. B) the size of the object. C) the shape of the object. D) all of the above choices. E) none of the above choices.
According to present theories, there is a neutrino for all the following particles except:
a. the electron. c. the muon. b. the tau lepton. d. the positive Kaon.