In Ptolemy's theory,
A) the planets move in circles-within-circles around the sun.
B) the planets move in elliptical orbits around the sun.
C) the planets move in circles around Earth.
D) the planets move in circles around the sun.
E) the planets move in circles-within-circles ["loop-the -loops"] around Earth.
E
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The "surface" of a black hole is known as the ______________
Fill in the blank(s) with correct word
The force of attraction between Earth and any object located on its surface is generally referred to as the object’s
a) mass. b) momentum. c) inertia. d) weight.
Which concept was NOT a part of Kepler's Laws of Planetary Motion?
A) All planetary orbits are ellipses. B) The square of the planet's period is equal to the cube of its average distance. C) A planet must move fastest in its orbit at perihelion. D) Epicycles are needed to explain the varying brightnesses of the planets.
Of the following distances, which is the closest an object can be to a lens of focal length f and still give a real image?
A. 3f B. 2f C. 1.2f D. 0.8f E. 0.49f