The perpendicular distance from the center of curvature to a spherical mirror is called
A) the center of curvature.
B) the radius of curvature.
C) the focal length.
D) the perpendicular axis.
E) twice the radius of curvature.
B
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A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct? (There could be more than one correct choice.)
A) The truck experiences the greater magnitude momentum change. B) The small car experiences the greater magnitude momentum change. C) The small car and the truck experience the same magnitude momentum change. D) The magnitude of the momentum change experienced by each one is inversely proportional to its mass. E) The magnitude of the momentum change experienced by each one is directly proportional to its mass.
Do neutrinos have mass, and how do we know?
A) No, because they are observed to move at lightspeed. B) No, because we have observed that their paths remain straight as they pass through a magnetic field. C) Yes, because we have observed them to transmute from one of the three neutrino types to another. D) Yes, for both of the reasons listed in answers c and d. E) Yes, because we have observed them to move slower than lightspeed.
The angular measurement in hours, minutes, and seconds from the celestial prime meridian eastward is called _______________
a. sundial b. protractor c. declination d. right ascension
Astronomers have defined a(n) _______________ around a star as a region within which planets that orbit there have temperatures permitting the existence of liquid water
Fill in the blank(s) with correct word