Power: What is the power factor for a series ac circuit containing a 50-? resistor, a 10-?F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?
A. 0.00
B. 0.46
C. 0.79
D. 1.0
Answer: B
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If it were not for the greenhouse effect on Earth,
a. there would be no liquid water on Earth. b. life as we know it would not have developed on Earth. c. it would be a much colder planet. d. there would be no oxygen in Earth's atmosphere. e. All of the above are results of the greenhouse effect.
When 1.0 kg of steam at 100°C condenses to water at 100°C, what is the change in entropy of the steam? The latent heat of vaporization of water is 22.6 × 105 J/kg
A) zero B) 6.1 × 103 J/K C) -6.1 × 103 J/K D) 22.6 × 105 J/K E) -22.6 × 105 J/K
What causes the arcs and bubble shapes in the dust and gas distribution of the Orion Nebula?
A.) Previous generations of supernovae. B.) Photon pressure of newly formed stars. C.) Gravity waves from black holes. D.) Stellar wind from local stars. E.) Synchrotron radiation.
What is the future of Triton?
What will be an ideal response?