DNA is a complex
a. atom.
b. molecule.
c. life form.
d. mystery.
e. acronym.
b
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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
According to the Rutherford model of the atom, most of the volume of an atom
a. is empty space. b. was occupied by the nucleus. c. contained positive charges. d. excluded electrons.
Energy Conservation With Conservative Forces: A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed will its gravitational potential energy (relative to the base of the cliff) be equal to its kinetic energy?
A. 3.1 m/s B. 4.4 m/s C. 6.3 m/s D. 8.9 m/s E. 13 m/s
The centripetal acceleration on an object in uniform circular motion
A. is directed tangent to the circle B. points away from the center of the circle C. points toward the center of the circle