If the primary of a transformer is connected to a dc power source, the transformer would have a voltage output
A) at a higher efficiency than with an ac source.
B) the same.
C) that is also dc.
D) only while being connected or disconnected.
E) none of the above
Answer: D
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As the moon circles Earth, the net force on it is
A) backward. B) directed outward away from Earth. C) directed inward toward Earth. D) forward. E) zero.
Reflection from smooth surfaces is called ______________ reflection
Fill in the blank(s) with correct word
The purpose of the moderator in a reactor is to
A. separate the nuclear fuel from the spent products of fission. B. provide cooling for the control rods. C. reduce the number of neutrons available for the chain reaction. D. slow neutrons down so that they will be more likely to initiate fission reactions.
An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror. How far is the object from the mirror?
A) 124 cm B) 47.6 cm C) 18.2 cm D) 12.0 cm