Transformers: When 5.0 A at 110 V flows in the primary of an ideal transformer, how many amps at 24 V can flow in the secondary?
A. 1.1 A
B. 4.6 A
C. 5.0 A
D. 23 A
Answer: D
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How many radioactive atoms are present in a sample that has an activity of 0.5 ?Ci and a half-life of 10 years? (1 curie = 3.7 × 10^10 decays/s)
a. 9.5 × 10^12 atoms b. 8.4 × 10^12 atoms c. 7.3 × 10^12 atoms d. 6.5 × 10^12 atoms e. 2.7 × 10^5 atoms
Which of the following particles are leptons?
a. Mesons and baryons. b. Mesons and neutrinos. c. Electrons and neutrinos. d. Muons and baryons. e. Tau and mesons.
The symbol G is used to represent
a. the acceleration of gravity b. the universal gravitational constant c. grams d. gravity e. none of the above
The idea that other civilizations are waiting for us to reach a certain technological level before revealing themselves to us is referred to as the
A) conspiracy hypothesis B) UFO hypothesis C) sentinel hypothesis D) zoo hypothesis