If you hold out your thumb at arm's length and rapidly blink each eye closed in an alternating pattern, your thumb appears to move left and right. This exercise is an example of _____________
Fill in the blank(s) with correct word
parallax
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The windings of a DC motor have a resistance of 6.0 ?. The motor operates on 120. V AC, and when running at full speed it generates a back emf of 105. V
(a) What is the starting current of the motor? (b) What current does the motor draw when operating at full speed?
Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:
a. it has the same position and the same velocity as A. b. it has the same position and the same acceleration as A. c. it has the same velocity and the same acceleration as A. d. it has the same displacement and the same velocity as A. e. it has the same position, displacement and velocity as A.
Reactance: As the frequency of the ac voltage across an inductor approaches zero, the inductive reactance of that coil
A. approaches zero. B. approaches one. C. approaches infinity. D. becomes negative.
Image height divided by object height gives __________
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