How did Newton deduce the dependence of the gravitational force on distance?
A) By observing the way that a large gravitational pendulum moved.
B) By comparing the time it takes Earth to orbit the sun with the time it takes to spin on its axis.
C) By calculating the moon's acceleration, and comparing it with the acceleration of a falling object.
D) By comparing the accelerations of objects falling to Earth from different heights.
E) By measuring the gravitational attraction between large massive lead spheres in the laboratory.
C
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The basic requirement for metabolism inside cells is
A) a source of carbon and a source of energy B) a source of carbon only C) a source of energy only D) the presence of ATP
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same
A) mass. B) volume. C) weight. D) all of the above E) none of the above
Evaporation cools the liquid that is left behind because the molecules that leave the liquid during evaporation
a. have kinetic energy. b. have greater than average speed. c. have broken the bonds that held them in the liquid. d. create vapor pressure.
Cosmology is the study of the overall structure and evolution of
A) the universe. B) stars. C) beauty. D) galaxies.