When did humans first learn that Earth is not the center of the universe?
A) about 2000 years ago
B) around the time that early humans acquired language
C) within the past 500 years
D) We haven't; there is still considerable scientific debate about whether Earth is the center of the universe.
C
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Energy Levels: If a hydrogen atom in the ground state absorbs a photon of energy 12.09 eV, to which state will the electron make a transition?
A. n = 2 B. n = 3 C. n = 4 D. n = 5
Springs: An ideal spring with a force constant (spring constant) of 15 N/m is initially compressed by 3.0 cm from its uncompressed position. How much work is required to compress the spring an additional 4.0 cm?
A. 0.0068 J B. 0.012 J C. 0.024 J D. 0.030 J
Young's Modulus: A 50-kg load is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. By what distance will the wire stretch? Young's modulus for steel is 2.0 × 1011 Pa.
A. 1.5 cm B. 2.5 cm C. 3.5 cm D. 4.5 cm
From the center out, the correct order of the parts of the Sun is
A. radiative zone, core, chromosphere, convection zone, photosphere, corona. B. core, convection zone, photosphere, chromosphere, corona, radiative zone. C. core, radiative zone, convection zone, photosphere, chromosphere, corona. D. core, convection zone, radiative zone, photosphere, chromosphere, corona.