One observation that supported an Earth-centered solar system is ________.
A. the shape of Earth's shadow on the Moon
B. the phases of the Moon
C. retrograde motion
D. the phases of Venus
E. the lack of parallax in the stars
Answer: E
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Which of the following objects is considered to possibly contain a black hole?
a. the central star of the Crab nebula b. the Orion nebula. c. LMC X-3 d. Algol e. PSR 1257+12
The planets move ________ through the sky, relative to the background stars.
A. west to east B. retrograde C. northeast to southwest D. east to west E. None of these choices is correct.
A uniform meter stick is pivoted to rotate about a horizontal axis through the 25-cm mark on the stick. The stick is released from rest in a horizontal position. The rotational inertia of a uniform rod about an axis perpendicular to the rod and through the center of mass of the rod is given by (1/12)ML2 . Determine the magnitude of the initial angular acceleration of the stick
a. 17 rad/s2 b. 13 rad/s2 c. 15 rad/s2 d. 19 rad/s2 e. 23 rad/s2
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^?10 m. The electric potential created by the proton at the position of the electron is
a. ?13.6 V. b. +13.6 V. c. ?27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.