The purpose of using epicycles and deferents to explain the motion of the planets in the night sky was to account for
a. prograde motion.
b. Mercury's and Venus's limited angular distance from the Sun.
c. retrograde motion.
d. non-uniform speed of the planets in their orbits.
e. precession of the equinoxes.
c
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A 12.0-N object is oscillating in simple harmonic motion at the end of an ideal vertical spring
Its vertical position y as a function of time t is given by y(t) = 4.50 cm cos[(19.5 s-1)t - ?/8]. (a) What is the spring constant of the spring? (b) What is the maximum acceleration of the object? (c) What is the maximum speed that the object reaches? (d) How long does it take the object to go from its highest point to its lowest point?
A concave spherical mirror has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image located?
A) 20 cm behind the mirror B) 20 cm in front of the mirror C) 6.7 cm behind the mirror D) 6.7 cm in front of the mirror
The asteroid belt is between the orbits of
a. Earth and Mars. b. Mars and Jupiter. c. Earth and Venus. d. Jupiter and Saturn.
If a radioactive isotope that was injected into your bloodstream has a half-life of 5 hours, how many hours do you have to wait before the amount of this isotope in your body is its original amount?
A) 10 B) 5 C) 25 D) 20 E) 15