What are the advantages and disadvantages of Earth having the tilt that it does?
Ans: preventing temperature extremes anywhere on the planet.
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When observing a star that increases dramatically in brightness, if a plateau is observed in the light curve during the declining phase, the event is probably:
A) a nova. B) a type I supernova. C) a type II supernova. D) fusion in an accretion disk around a white dwarf. E) fusion in an accretion disk around a neutron star.
Using the energy-time version of the uncertainty principle, estimate the uncertainty in energy of a state with lifetime 10-9 s.
A. 10-2 eV B. 10-7 eV C. 10-12 eV D. 10-15 eV E. 10-18 eV
Which of these moons are most interesting to exobiologists?
A) Europa and Miranda B) Europa and Enceladus C) Titan and Triton D) Triton and Charon E) Io and Titan
The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion of the satellite at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At these two points:
a. the tangential velocities are the same. c. the angular momenta are the same. b. the angular velocities are the same. d. the kinetic energies are the same.