A magnifying glass has a focal length of 7.0 cm. What is the angular magnification if the image is viewed by a person having a relaxed eye with the near point of 25 cm?
A) 1.6
B) 2.6
C) 3.6
D) 4.6
C
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Chromatic aberration occurs in a ____ telescope when ____
a. reflecting; different colors of light do not focus at the same point. b. refracting; different colors of light do not focus at the same point. c. reflecting; light of different wavelengths get absorbed by the mirror. d. refracting; light of different wavelengths get absorbed by the lens.
Jogging Jake runs along the top of a moving flatcar in the direction of motion of the flatcar. If he runs in the opposite direction, the combined momentum of Jake and the flatcar relative to an observer at rest will be
A) more. B) the same. C) less.
A photon is an example of
A) a lepton. B) a meson. C) a baryon. D) a gauge boson. E) hadrons.
A wheel rotating about a fixed axis has an angular position given by q = 3.0 - 2.0t3, where q is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s?
a. -1.0 rad/s2 b. -24 rad/s2 c. -2.0 rad/s2 d. -4.0 rad/s2 e. -3.5 rad/s2