You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is
a. 85 m.
b. 170 m.
c. 340 m.
d. 680 m.
e. none of the above.
c
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This painting shows a futuristic spacecraft powered by the detonation of small hydrogen bombs. If we actually had such a spacecraft, what would it allow us to do?
A) It would allow us to make a one-way trip to the nearest star besides the Sun in about a century. B) It would allow us to travel roundtrip to almost anywhere in the Milky Way Galaxy in just a few years of ship time. C) It would allow us to travel from Earth to Mars in less than an hour. D) It would allow us to travel up to several times faster than the speed of light.
Four 20. ? resistors are connected in parallel. What is the equivalent resistance?
What will be an ideal response?
Why can we say that 1963's fallout value was the highest? Explain why this could be so
What will be an ideal response?
Stars to the upper right of the Hertzsprung-Russell diagram tend to be relatively
A) hot and blue. B) long lasting. C) huge. D) yellow and of average size.