Gravitational forces act between objects in proportion to their ________.
A) volumes
B) masses
C) charges
D) polarizability
E) densities
Correct Answer:
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Q23: The nucleus of an atom does not
Q24: Different isotopes of a particular element contain
Q25: The atomic mass unit is presently based
Q26: In the symbol below,X = _.
Q27: In the symbol below,x is _.
Q29: Which one of the following basic forces
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Q31: Which isotope has 36 electrons in an
Q32: Which isotope has 45 neutrons?
A) 
Q33: Different isotopes of a particular element contain
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