How many atoms are there in the width of a human hair?
A. 25
B. 125,000
c. 273,000,000,000
D. 6x10^23
Answer: B. 125,000
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Which of the following seems to be a region of self-sustaining star formation?
A) The Orion complex B) The asteroid belt C) The Kuiper Belt D) The Solar System
Doubling the mean distance from the Sun results in changing the orbital period of revolution by what factor?
a. 21/2 b. 2 c. 23/2 d. 22
Two long bar magnets are aligned so that north poles face each other. The magnets are separated by 1 cm, and a repulsive force between the north poles is 0.04 N. When the separation is increased to 2 cm the force will be
A. 0.020 N. B. 0.050 N. C. 0.40 N. D. 0.025 N. E. 0.010 N.
A ____ generally contains well over 1000 galaxies and is quite dense. They often contain many giant elliptical galaxies
a. local group b. poor cluster c. rich cluster d. tidal tail e. quasar