The reason that most extrasolar planets are found close to their parent stars is
What will be an ideal response?
the amount and frequency of the star's motion are both higher.
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The Cassini spacecraft found evidence that the E Ring is related to Enceladus through:
A) the gravitational interactions by Enceladus on the particles in the E Ring. B) the deposition of gases from Enceladus on the particles of the E Ring making them more reflective as the gas condenses on the particles. C) a continual supply of icy particles spewed via volcanism on Enceladus. D) the impact history of Enceladus—a major impact caused parts of the moon to be ejected from the surface and cross the Roche Limit to become the E Ring. E) their common origin: both the E Ring and Enceladus have a common "ancestral" comet parent.
What is the main factor that drives Darwinian evolution?
A) the competition for finite resources B) the need to have sex C) the ability of an organism to harness the energy of the Sun D) the size of an organism
A supernova that occurred 30,000 years ago in a galaxy 100,000 light years away will be observed on Earth:
A) 30,000 years from now. B) 70,000 years ago. C) 70,000 years from now. D) 100,000 years ago. E) 100,000 years from now.
Adisa pulls a 50-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface, what is the net change in potential energy of the crate?
a. 120 J c. 250 J b. -120 J d. 150 J