Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 120 V. What is the power output of the secondary coil?
A) 30 W
B) 120 W
C) 480 W
D) 960 W
E) need more information
Answer: C
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Two 4.0-? resistors are connected in parallel, and this combination is connected in series with 3.0 ?. What is the effective resistance of this combination?
A) 1.2 ? B) 5.0 ? C) 7.0 ? D) 8.0 ? E) 11 ?
Which of the following is true of the Sun?
A) It is a nonluminous body. B) It generates energy by nuclear fission reactions. C) It is about 100 times larger in diameter than Earth. D) It shines by reflecting light from Venus.
You see colors in a rainbow because of
a. interference. b. diffraction. c. specular reflection. d. dispersion. e. polarization.
If heat death results in a maximum amount of entropy, then what does this say about entropy at the beginning of the universe?
A) Entropy at the beginning of the universe must also have been at a maximum. B) There was a change in the direction of entropy flow about 7 billion years ago. C) The Big Bang was a moment of minimal entropy. D) Nothing.