All atoms of an element have the same number of:
a. ions
b. protons only
c. neutrons only
d. electrons.
e. protons and neutrons
b
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Contrast the two types of radio galaxies in structure
What will be an ideal response?
A 2.0-kg block is projected down a plane that makes an angle of 20° with the horizontal with an initial kinetic energy of 2.0 J. If the coefficient of kinetic friction between the block and plane is 0.40, how far will the block slide down the plane before coming to rest?
a. 3.0 m b. 1.8 m c. 0.30 m d. 1.0 m e. 1.3 m
Modern scientific theories are NOT
A) testable. B) continuously tested. C) simple. D) perfect. E) elegant.
Shapley used the distribution of globular clusters in the galaxy to determine that the Sun was not at the center of the Milky Way
Indicate whether the statement is true or false