Which term in the simplified Drake equations depends on sociological factors?
A) NHP
B) flife
C) fciv
D) fnow
D
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What do the size and shape of Widmanstätten patters indicate?
a. the age of the meteorite b. that the molten metal of the meteorite cooled very slowly c. the metallic content of the core of the meteorite d. the origination of the meteorite e. the number of organic compounds found within the meteorite
The gravitational force between two metal spheres in outer space is 2000 N. How large would the force be if the two spheres were four times as far apart?
A. 32,000 N B. 8000 N C. 500 N D. 125 N
A heavy meterstick has mass m. When the meterstick is thrown like a spear past you at speed v, you measure its momentum to be 2mv. What do you measure its length to be?
A) 1 m B) 0.87 m C) 0.5 m D) 0.25 m E) none of the above
Light travels at a speed of 300,000 km/s. About how far is a light-year?
A) 10 million meters B) 10 billion km C) 300,000 km D) 10 million km E) 10 trillion km