A red crab very deep in water, where sunlight is dim, appears
A) red.
B) orange.
C) cyan.
D) brown.
E) no color–black.
Answer: E
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Magnifying Glass With the Image at the Near Point of the Eye: A magnifying glass of focal length 150 mm is used to examine an old manuscript very closely by a person with a near point at 25 cm.(a) What is the maximum angular magnification given by the lens?(b) What is the angular magnification for relaxed eye-viewing, with the image at infinity?
Fill in the blank(s) with the appropriate word(s).
Which of the following scientists is credited with the discovery of the electron?
a) Planck b) Curie c) Maxwell d) Thompson e) Fermi
The area under a graph of ax vs. t from t = ti to t = tf represents
a. xf ? xi. b. vf ? vi. c. xav. d. vav. e. aav.
If a force on an object is aimed perpendicular to the direction of the object's velocity, the force does
a. no work c. negative work b. positive work d. any of the above