Given that our galaxy has a volume of approximately 8 1012 ly3, what would be the average minimum amount of time to exchange messages between civilizations if there are currently 125,000 intelligent civilizations in our galaxy?
A) 800 years
B) 1,200 years
C) 200 years
D) 400 years
A
Physics & Space Science
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If a light source is approaching you at a speed very close to the speed of light, it will appear:
A) redder than it is. B) bluer than it is. C) brighter than it is. D) fainter than it is. E) lower temperature than it is.
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A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much force is needed to stretch the string by this amount? Young's modulus for steel is 2.0 × 1011 N/m2
What will be an ideal response?
Physics & Space Science
A student weighing 700 N climbs a flight of stairs 5.0 m high. Calculate the work done
Physics & Space Science
A gamma ray is another name for an electron
Indicate whether the statement is true or false
Physics & Space Science