When Copernicus first created his Sun-centered model of the universe, it did not lead to substantially better predictions of planetary positions than the Ptolemaic model. Why not?
What will be an ideal response?
Copernicus still used perfect circles for the orbits of planets.
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Short-focal-length lenses and mirrors must be strongly curved
a. True b. False Indicate whether the statement is true or false
Which of the following statements about the Moon is true?
A) The Moon goes through a cycle of phases because it always has the same side facing Earth. B) If you see a full Moon from North America, someone in South America would see a new Moon. C) The Moon's distance from Earth varies during its orbit. D) The Moon is visible only at night. E) The side of the Moon facing away from Earth is in perpetual darkness.
A star with an apparent magnitude of +2.3 and an absolute magnitude of +5.9 lies ________ than 10 parsecs away
Fill in the blank(s) with correct word
A solid sphere, a solid cylinder, and a hoop all have the same mass and radius. Each are sent down identical inclined planes starting from rest. Their kinetic energies at the bottom of the incline are Ksphere, Kcylinder, and Khoop. Which of the following is true?
a. Ksphere > Kcylinder b. Khoop > Ksphere c. Khoop > Kcylinder d. Kcylinder > Khoop e. No answer above is correct.