What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm so she can see things clearly that are 25 cm in front of her?
A) +2.8 diopters
B) -2.8 diopters
C) -4.0 diopters
D) -4.2 diopters
E) +4.2 diopters
A
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Which of the following statements about Venus is correct?
A. Venus has a constant velocity. B. There is no net force acting on Venus. C. The Sun exerts a stronger force on Venus than Venus exerts on the Sun. D. Venus is continually accelerating toward the Sun.
With what color light would you expect to be able to see the greatest detail when using a microscope?
A) blue, because it is brighter B) red, because of its long wavelength C) blue, because of its shorter wavelength D) red, because it is refracted less than other colors by glass E) The color makes no difference in the resolving power, since this is determined only by the diameter of the lenses.
Rotational Dynamics: The rotating systems shown in the figure differ only in that the two identical movable masses are positioned a distance r from the axis of rotation (left), or a distance r/2 from the axis of rotation (right). If you release the hanging blocks simultaneously from rest, and call tL the time taken by the block on the left and tR the time taken by the block on the right to reach the bottom, respectively, then
A. tL > tR. B. tL = tR. C. tL < tR.
A high pressure system in the Northern Hemisphere will have
a. rising air which draws surface air in, the surface winds spiral to the left. b. rising air which draws surface air in, the surface winds spiral to the right. c. sinking air which pushes surface air out, the surface winds spiral to the left. d. sinking air which pushes surface air out, the surface winds spiral to the right.