Resistors in Combination: A 2.0-? resistor is in series with a parallel combination of 4.0-?, 6.0-?, and 12-? resistors. What is the equivalent resistance of this system?
A. 24 ?
B. 4.0 ?
C. 1.8 ?
D. 2.7 ?
Answer: B
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Which of the following statements best reflects our current knowledge about the term flife in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow? A) The value of flife is equal to 1/2. B) The value of flife is greater than 10. C) The value of flife is between 0 and 1. D) The value of flife is either 0 or 1. E) The value of flife is less than 0.0000001.
The greenhouse effect occurs in the
A) troposphere. B) stratosphere. C) lithosphere.
In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 104 N/m and the pressure on the bottom surface is 9.0 × 104 N/m2. If the area of the top and bottom surfaces of each wing is 2.0 m2, what is the total lift on the model airplane?
A. 2.0 × 103 N B. 8.0 × 103 N C. 1.6 × 104 N D. 3.6 × 104 N E. 1.0 × 103 N
The three most abundant gases in our atmosphere are nitrogen, oxygen, and argon
Indicate whether the statement is true or false