The electric field established by a generator in an ac circuit
A) increases via the inverse-square law.
B) changes magnitude and direction with time.
C) acts in one direction.
D) is non-existent.
E) none of the above
Answer: B
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Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2 . What is the magnitude of the force exerted on the middle cube by the left cube in this case?
a. 18 N c. 54 N b. 27 N d. none of the above
The wavelength of an electromagnetic wave is 600 nm. What is its frequency?
A) 200 × 1012 Hz B) 300 × 1012 Hz C) 400 × 1012 Hz D) 500 × 1012 Hz E) 600 × 1012 Hz
A ball is allowed to drop from rest. If the upward direction is positive, then after 2 seconds its velocity will be
A. 9.8 m/s. B. -9.8 m/s. C. -19.6 m/s. D. 19.6 m/s.
From coolest to hottest, the seven letters for the star types are ________
Fill in the blank(s) with correct word