Power: A series ac circuit has a reactance of 11 k? due to its capacitance, a reactance of 3 k? due to its inductance, and a resistance of 29 k?. What is the power factor of this circuit?
A. 0.96
B. 0.27
C. 1.04
D. 0.48
Answer: A
Physics & Space Science
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Young's Modulus: A solid steel column is 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 2.0 × 1011 N/m2. By what distance does the column shrink when a 5000-kg truck is supported by it?
A. 8.0 × 10-7 m B. 3.2 × 10-6 m C. 7.8 × 10-6 m D. 3.1 × 10-5 m
Physics & Space Science
Which of the following doesn't have ohm units?
A) ? L B) ? C C) R D) (XcXc)/R E) (XL - XC)
Physics & Space Science
If the frequency of blinks for a light source appears to double as the light source approaches you, the frequency of blinks as it moves away from you at the same speed
A) is halved. B) is doubled. C) stays the same.
Physics & Space Science
Galaxy mergers take hundreds of millions of years to complete
Indicate whether the statement is true or false
Physics & Space Science