The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system? Another theory would be needed
a. Common direction of rotation of the planets.
b. Common direction of revolution of the planets.
c. The formation of hydrogen atoms in the solar system from subatomic particles.
d. The density of the Jovian planets.
C
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Size of the Nucleus: The radius R of a nucleus of mass number A is given by R = R0 A1/3, where R0 = 1.2 × 10-15 m, calculate the density of a nucleus that has contains 57 protons and 82 neutrons. The mass of a nucleon (proton or neutron) is 1.67 × 10-27 kg.
Fill in the blank(s) with the appropriate word(s).
Materials in which the resistivity becomes essentially zero at very low temperatures are referred to as
A) conductors. B) insulators. C) semiconductors. D) superconductors.
Two objects are dropped from a bridge, an interval of 1.0 s apart, and experience no appreciable air resistance. As time progresses, the DIFFERENCE in their speeds
A) increases. B) remains constant. C) decreases. D) increases at first, but then stays constant. E) decreases at first, but then stays constant.
Conservation of ____________ is observed in strong and electromagnetic interactions but not in weak interactions
a. baryon number b. lepton number c. strangeness d. charm e. beauty