Von Neumann machines are hypothetical
A) self-replicating probes sent out to explore the galaxy by an advanced civilization
B) devices capable of creating wormholes
C) devices capable of time travel
D) spacecraft capable of traveling faster than the speed of light
A
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You are driving along a highway at 25.0 m/s when you hear the siren of an emergency vehicle traveling in the opposite direction on the other side of the highway
When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the frequency of the siren? The speed of sound in air is 343 m/s. A) 1850 Hz B) 2000 Hz C) 2050 Hz D) 2010 Hz E) 1980 Hz
Explain how increasing the efficiency of cars could help contain greenhouse warming
What will be an ideal response?
Imagine a steel pipe that doesn't leak from the sides and is already filled with water. Water enters at a rate of 2 kg/s but leaves at a rate of 1 kg/s. Which of the following is true?
A. The water pressure inside the tube rises as water is added B. The water flow must be laminar C. The tube is narrower where the water enters than where it leaves D. It is not possible for this situation to occur
Of the planetary systems that may exist in our galaxy, what fraction may contain a habitable planet?
A) almost all B) about half C) about a tenth D) only 1 in 50 E) less than 1 in 100