The two families of fundamental particles out of which all ordinary matter is made are
A) protons and neutrons.
B) leptons and quarks.
C) electrons and neutrinos.
D) quarks and neutrinos.
E) leptons and photons.
B
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The lowest-mass stars cannot become giants because
a. they do not contain helium. b. they rotate too slowly. c. they cannot heat their centers hot enough. d. they contain strong magnetic fields. e. they never use up their hydrogen.
The Milky Way galaxy is part of
a. the Virgo cluster. b. the Large Magellanic Cloud. c. the Small Magellanic Cloud. d. the Local Group. e. a rich cluster.
Thin Lenses: A convex lens has focal length f. If an object is placed at a distance beyond 2f from the lens on the principal axis, the image is located at a distance from the lens
A. of 2f. B. between f and 2f. C. of f. D. between the lens and f. E. of infinity.
A bullet is fired from ground level with a speed of 150 m/s at an angle 30.0° above the horizontal at a location where g = 10.0 m/s2
What is the range of the bullet (horizontal distance from the starting point to the point where it lands on the ground)? A) 1130 m B) 150 m C) 13.0 m D) 1950 m E) 975 m