About 78% of the air is composed of

a)carbon dioxide.
b)oxygen.
c)nitrogen.
d)argon.


c

Physics & Space Science

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A 5-kg shark swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after his meal is

A) 1/2 m/s. B) 1/5 m/s. C) 1/6 m/s. D) 2/3 m/s. E) 3/2 m/s.

Physics & Space Science

Kepler relied heavily on the telescopic observations of Galileo in developing his laws of planetary motion

Indicate whether the statement is true or false

Physics & Space Science

Which of the following objects are probably not located in the same general region of the solar system in which they originally formed?

A) Kuiper belt comets B) asteroids of the asteroid belt C) Pluto D) Oort cloud comets

Physics & Space Science

Which of the following radionuclides is used to date once-living material?

a. Rubidium-87 b. Potassium-40 c. Thorium-232 d. Carbon-14

Physics & Space Science