Which of the following is the most common type of main-sequence star?

A) an O star
B) an A star
C) an F star
D) an M star
E) a G star


D

Physics & Space Science

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My Greenland precipitation paper is currently under peer review. Which of the following is a place for original peer reviewed literature to be published?

a. The New York Times newspaper b. Time Magazine c. Scientific American Magazine d. The Journal of Geophysical Research e. The Metropolitan newspaper

Physics & Space Science

A leaf falls from a tree. Compare its kinetic energy K to its potential energy U

A) K increases, and U decreases. B) K decreases, and U increases. C) K decreases, and U decreases. D) K increases, and U increases. E) K and U remain constant.

Physics & Space Science

Shapley found the globular clusters were strongly concentrated toward Sagittarius

Indicate whether the statement is true or false

Physics & Space Science

The value of the momentum of a system is the same at a later time as at an earlier time if there are no

a. collisions between particles within the system. b. inelastic collisions between particles within the system. c. changes of momentum of individual particles within the system. d. internal forces acting between particles within the system. e. external forces acting on particles of the system.

Physics & Space Science