In a nuclear reactor, _________________ are used to limit the number of neutrons passing from one fuel rod to another
Fill in the blank(s) with correct word
control rods
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Which of the following statements correctly describes the law of conservation of energy?
A) An object always has the same amount of energy. B) Energy can change between many different forms, such as potential, kinetic, and thermal, but it is ultimately destroyed. C) Energy can change between many different forms, such as potential, kinetic, and thermal, but the total quantity of energy in the universe never changes. D) The fact that you can fuse hydrogen into helium to produce energy means that helium can be turned into hydrogen to produce energy. E) It is not really possible for an object to gain or lose potential energy because energy cannot be destroyed.
A 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) 24 A E) 48 A
If the number of turns in a rectangular coil of wire that is rotating in a magnetic field is doubled, what happens to the induced emf, assuming all the other variables remain the same?
A) It stays the same. B) It is reduced by a factor of 4. C) It is reduced by a factor of 2. D) It is doubled. E) It is quadrupled.
A car is moving with a velocity (3.0 m/s)x + (1.0 m/s)y and 2.5 seconds later its velocity is (6.0 m/s)x - (3.0 m/s)y. What is the magnitude of the average acceleration of the car?
A) 0.82 m/s2 B) 1.6 m/s2 C) 2.0 m/s2 D) 4.5 m/s2 E) 6.2 m/s2