Suppose there are a million habitable planets in our galaxy, that one in ten are habitable, that one in a thousand planets with life had at some point had an intelligent civilization, and that one in a hundred civilizations that has ever existed is

in existence now. Given this, how many civilizations are in existence now? A) 10
B) 1
C) 1000
D) 100


B

Physics & Space Science

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A sprinter runs 100.0 m in 9.87 seconds. If he travels at constant acceleration for the first 75.0 m and then at constant velocity for the final 25.0 m, what was his peak velocity?

A. 17.7 m/s. B. 17.5 m/s. C. 20.3 m/s. D. 15.4 m/s.

Physics & Space Science

Density is calculated as

A. mass times volume. B. volume divided by mass. C. mass divided by volume. D. mass times gravity.

Physics & Space Science

In a double-slit experiment, the distance between the slits is 0.2 mm, and the distance to the screen is 150 cm. What wavelength (in nm) is needed to have the intensity at a point 1 mm from the central maximum on the screen be 80% of the maximum intensity?

A. 900 B. 700 C. 500 D. 300 E. 600

Physics & Space Science

The process in which one plate slides under another is called subduction and occurs where seafloor crust descends into the mantle below continental crust

Indicate whether the statement is true or false

Physics & Space Science