In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth.
b. the center of the universe was the Sun with the Milky Way representing other distant planets.
c. the Sun was at the center of the universe.
d. Earth was at the center of the universe.
e. None of the above was believed.
d
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A. 7.58 m B. 2.41 m C. 1.21 m D. 0.829 m E. 0.132 m
Spherical Mirrors: A concave mirror having a focal length of magnitude 5.0 cm forms an image 4.0 cm behind the mirror. Where is the object for this image?
A. 2.2 cm in front of the mirror B. 2.2 cm behind the mirror C. 9.0 cm in front of the mirror D. 1.0 cm behind the mirror E. 20 cm behind the mirror
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Indicate whether the statement is true or false
Two sound waves can interfere:
1.only when traveling in the same direction. 2.only when the frequencies are the same. 3.only when both are sinusoidal. 4.only when the phase difference is constant. 5.None of the above.