In general, the time it takes from when in interstellar cloud fragment first begins collapsing until it gives birth to a main-sequence star is
A) shorter for less massive stars.
B) longer for less massive stars.
C) about the same for all stars.
D) dependent on the rotation rate of the star.
B) longer for less massive stars.
You might also like to view...
As a star begin to form the initial energy source is from
a. nuclear fusion. b. nuclear fission. c. gravitational potential energy. d. magnetic fields.
A converging mirror with a focal length f forms an image of the moon. Where is the image?
A. Very close to f behind the mirror B. At the surface of the mirror C. At the radius of curvature of the mirror D. Very close to f in front of the mirror
If a nucleus decays by ?+ decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more protons than the original nucleus. B) The daughter nucleus has more neutrons than the original nucleus. C) The daughter nucleus has the same number of nucleons as the original nucleus. D) The daughter nucleus has fewer protons than the original nucleus. E) The daughter nucleus has fewer neutrons than the original nucleus.
Which of the following quantities are units of impulse? (There could be more than one correct choice.)
A) N ? m B) kg ? s/m C) kg ? m/s D) N ? s E) kg ? m2/s2