A 15,000-watt motor is used to lift a 18,000 kg aircraft to a height of 10 m. How much time does it take to lift the aircraft with the motor?
117.6 s
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If an AC circuit consists of a 220 mH inductor in series with a 75 k 
resistor and an AC generator with rms voltage of 12 V. At what frequency will the rms voltage drop across the resistor be equal to that across the inductor?
A. 114 kHz B. 5.5 kHz C. 875 Hz D. 18 kHz
Which of the following statements about constellations is false?
A) There are only 88 official constellations. B) Some constellations can be seen from both the Northern and Southern hemispheres. C) Some constellations can be seen in both the winter and summer. D) It is possible to see all the constellations from Earth's equator. E) Most constellations will be unrecognizable hundreds of years from now.
The luminous matter in the universe accounts for what percent of the total mass of the universe?
A) About 5% B) About 23% C) About 27% D) About 73% E) 100%
Light in a vacuum has a speed of ______________ m/s
Fill in the blank(s) with correct word