In terms of the "eras" that scientists use to describe different times in the history of the universe, we live in the
A) era of galaxies.
B) era of nucleosynthesis.
C) era of nuclei.
D) Planck era.
A) era of galaxies.
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Starting from rest, a 2-kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on the body is __________
Fill in the blank(s) with correct word
The light directly from the Sun is
a. polarized. b. unpolarized. c. horizontally polarized. d. vertically polarized.
A helium-neon laser (? = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5°, what is the line spacing, d?
a. 1.81 × 10^?6 m b. 1.00 × 10^?5 m c. 1.00 × 10^?4 m d. 1.31 × 10^?6 m e. 6.76 × 10^?7 m
Astronomy and astrology were often practiced together in ancient cultures, and astrology played an important role in the historical development of astronomy
Indicate whether the statement is true or false