Which of these is impossible, by the second law of thermodynamics?
A. An engine that generates electricity by extracting heat from cold water and dumping waste heat to warmer air
B. A single match carelessly discarded causes 1500 acres of woodland to burn
C. Using heat exhausted by a refrigerator to cook a meal
D. Water evaporating from a lake and then condensing to form clouds
Answer: A
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Why does the Doppler method only provide a measure of the minimum mass of a planet?
B) Without a transit observation, the size and therefore density of the planet is unknown. C) We do not know the exact composition of the planet. D) The Doppler shift tells only part of a planet's orbital speed (the part toward and away from the observer). E) We do not have the technology to make a direct image of a planet yet.
You are going to construct a new optical observatory, and money is no object. Other than putting it into space, what factors will affect your decision for its location on Earth?
What will be an ideal response?
The sum of two vectors has the greatest magnitude when the angle between these two vectors is
What will be an ideal response?
Velma, who is carrying a "light clock," passes Mort at a high speed. Velma observes that, during one tick of her own light clock, the light beam on her clock travels
A) further than 300,000 km. B) a distance of one light year. C) no distance at all. D) less than 300,000 km. E) 300,000 km.