Consider the use of the terms "rotation" and "revolution". In physics:
a. the words are used interchangeably.
b. the words are used interchangeably but "rotation" is the preferred word. c. the words have different meaning.
d. "rotation" is the correct word, and "revolution" should not be used.
C
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Lenz's Law: As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field B is present directed to the right. The bar is moving upward with velocity of magnitude ?. What is the polarity of the induced emf in terminals X and Y?
A. X and Y are at the same potential. B. X is positive and Y is negative. C. Y is positive and X is negative.
A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current in the apparatus?
A) 0.10 A B) 0.60 A C) 1.0 A D) 6.0 A
A girl weighing 450. N sits on one end of a seesaw that is 3.0 m long and is pivoted 1.3 m from the girl. If the seesaw is just balanced when a boy sits at the opposite end, what is his weight? Neglect the weight of the seesaw
What will be an ideal response?
An ideal transformer consists of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?
A) 0.75 A B) 1.3 A C) 12 A D) 48 A E) 24 A