A bar magnet has a north pole and a south pole. This arrangement is referred to as a
A. monopole.
B. dipole.
C. bipole.
D. equipole.
E. oppopole.
B. dipole.
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Which of the following statements is correct?
a. For a nearsighted person, the near point is always located closer than 25 cm from the eye and the corrective lens is diverging. b. For a nearsighted person, the near point is always located closer than infinity from the eye and the corrective lens is converging. c. For a farsighted person, the near point is always located farther than 1 m from the eye and the corrective lens is diverging. d. For a farsighted person, the near point is always located farther than 25 cm from the eye and the corrective lens is converging.
Christie bought a 9 x 50 pair of binoculars for stellar observing. The 9 is the
A) f/number. B) aperture in cm. C) angular magnification. D) aperture in mm. E) f/number-1
A ball vibrates back and forth from the free end of an ideal spring having a spring constant of 20 N/m. If the amplitude of this motion is 0.30 m, what is the kinetic energy of the ball when it is 0.30 m from its equilibrium position?
A) 0.00 J B) 0.22 J C) 0.45 J D) 0.90 J E) 1.4 J
A thin lens of focal length 12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. Where will the image be formed?
A. 2.5 cm behind the lens B. 5.6 cm behind the lens C. 5.6 cm in front of the lens D. 50 cm behind the lens E. 50 cm in front of the lens