Which of the following is NOT a solution to the Fermi Paradox?
A) no one is interested or able to communicate
B) we are unable to detect their communications
C) we are not interested in communicating
D) no one is out there
C
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Transformers: You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-? resistor. How many windings should the secondary circuit contain?
Fill in the blank(s) with the appropriate word(s).
The presently accepted value of the Hubble constant gives an age of:
A) 4.5 billion years. B) 8-9 billion years. C) 14 billion years. D) 18 billion years. E) 22 billion years.
What do we mean by inflation, and why might it have occurred at the end of the GUT era?
What will be an ideal response?
Sound interference with a pair of radio loudspeakers can be nicely demonstrated when the
A) radio signal is monaural for each. B) input and output of the speakers are reversed. C) speakers are brought face to face. D) all of the above E) none of the above