Copernicus
a. proposed that the Earth orbited the Sun.
b. showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun.
c. neither proposed that the Earth orbited the Sun and showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun.
d. both proposed that the Earth orbited the Sun and showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun.
d
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Objects can be charged by
a. induction. b. friction. c. touching. d. All of the above. e. None of the above.
The luminosity of the Sun is a measure of
A) the energy received by the Sun on Earth's surface. B) the energy received by the Sun at the location of Earth. C) the energy received by the Sun at any location in the solar system. D) the energy emitted by the Sun at the photosphere. E) the total energy emitted by the Sun in all directions.
When we say an appliance "uses up" electricity, we are actually saying that
A) current disappears. B) electric charges are dissipated. C) the main power supply voltage is lowered. D) electrons are taken out of the circuit and put somewhere else. E) electrical energy changes to thermal energy.
The net force acting on a body gives the direction of the ________ of the body.
Fill in the blank(s) with the appropriate word(s).