The satellites discovered by Galileo
a. orbit the planet Jupiter.
b. orbit the terrestrial planets.
c. orbit asteroids.
d. orbit Mars.
e. orbit extrasolar planets.
A
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A controlled experiment has all variables held constant
a. true b. false
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A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 × 10-7 Pa. If the volume of the chamber is 0.500 m3 and the temperature is 27°C,
how many molecules are left inside the chamber? (NA = 6.022 × 1023 molecules/mol, R = 8.31 J/mol ? K) A) 1.2 × 1013 B) 2.4 × 1013 C) 1.2 × 1012 D) 2.4 × 1012 E) 1.2 × 1014
Measuring the amount of deuterium in the universe allows us to set a limit on
A) the density of ordinary (baryonic) matter the universe. B) the total amount of mass in the universe. C) the acceleration of the universe. D) the current age of the universe.