It is difficult to see items sharply in dim light because what
A. We are seeing primarily with the rods
B. We are seeing primarily with the cones
C. Rods do not adapt to the dark
D. We are mostly seeing with the fovea
Ans: A. We are seeing primarily with the rods
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A steel tube with diameters d2 5 86 mm and d1 5 52 mm is twisted by torques at the ends. The diameter of a solid steel shaft that resists the same torque at the same maximum shear stress is approxi-mately:
(A) 56 mm
(B) 62 mm
(C) 75 mm
(D) 82 mm
Consider a vibrating string that makes a sound wave that moves through the air. As the guitar string moves up and down, the air molecules that are a certain horizontal distance from the string will move
a. up and down. b. toward and away from the guitar string. c. back and forth along the direction of the length of the string. d. in circles around the guitar string.
Two isotopes have the same __________ number
Fill in the blank(s) with correct word